💷 UK Energy & Water Bill Calculator — Free, Accurate, 2026

Calculate your exact electricity, gas, and water bills using official January 2026 Ofgem rates and Ofwat-verified water company charges. No registration, no guesswork — just clear, honest numbers.

✦ Updated Jan–Mar 2026  •  Official Ofgem Price Cap Rates  •  100% Free

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🎁 Find Support Schemes

🧮 Free UK Bill Calculators

Seven specialist calculators using official 2025-26 rates. Enter your usage details and get accurate estimates in seconds — no signup, no spam, no cost.

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Electricity Bill Calculator

Calculate your electricity costs using January 2026 Ofgem price cap rates: 27.69p per kWh unit rate and 54.75p per day standing charge. Enter your monthly or annual kWh usage to see exactly what you should be paying.

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Gas Bill Calculator

Estimate gas bills with the current Ofgem price cap rate of 6.33p/kWh plus 29.82p/day standing charge. Typical household pays around £850/year for gas. Find out if you’re paying too much.

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Water Bill Calculator

Calculate water and sewerage costs for all major UK water companies. Average bill is now £603/year in 2025-26 — up 26% from £473 in 2024. Compare your company’s rates and find out what metered vs rateable value billing means for you.

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kWh Usage Calculator

Convert appliance usage to kWh and annual costs. Understand exactly what’s driving your energy bill — from your fridge and washing machine to electric showers and EV charging. Essential for finding where to cut costs.

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Standing Charge Calculator

Daily standing charges vary widely across energy suppliers — the difference can be over £200/year. Calculate your annual standing charge cost and see how switching tariff or supplier could save you money even before accounting for unit rates.

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Ofgem Price Cap Calculator

The Ofgem price cap applies to standard variable tariffs and is updated every quarter. Use this calculator to check how the current and upcoming price cap periods affect your specific household’s bills based on your actual usage.

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Water Meter vs Rateable Value

Should you switch to a water meter? Single people and couples in larger properties typically save £100–£400/year. Installation is free from all water companies, and there’s a two-year free trial with a guaranteed rollback option if your bills increase.

Compare Now →

⚡ How Your UK Energy Bill Is Calculated

Most households receive energy bills that feel opaque and confusing. Here’s exactly how the figures are worked out — and why your bill might be higher than you’d expect.

The Two Parts of Every Energy Bill

Every UK energy bill — whether for electricity or gas — is made up of two distinct charges. The first is your unit rate, which is the cost per kilowatt-hour (kWh) of energy you actually use. The second is the standing charge, which is a daily fixed fee you pay simply for being connected to the grid, regardless of how much energy you use. Understanding both is essential to comparing tariffs accurately.

Under the January 2026 Ofgem price cap, the electricity unit rate is 27.69p/kWh and the standing charge is 54.75p/day. For gas, the unit rate is 6.33p/kWh and the standing charge is 29.82p/day. These are the maximum rates suppliers can charge on standard variable tariffs — though suppliers on fixed deals may charge differently.

💡 Quick calculation: A typical household using 2,700 kWh electricity/year pays: (2,700 × 27.69p) + (365 × 54.75p) = £747.63 + £199.84 = £947.47/year on electricity alone.

Why the Ofgem Price Cap Matters

The Ofgem price cap doesn’t cap the total amount you pay — it caps the rate per unit. So if you use more energy than the “typical household” assumption (2,700 kWh electricity, 11,500 kWh gas), your total bill will exceed the £1,758 figure quoted in the media. Conversely, a well-insulated flat with low usage might pay significantly less. The price cap is reviewed every three months — January, April, July, and October.

Understanding Your Bill Components

Rates apply to standard variable tariff customers (the majority of UK households). Those on fixed-rate deals may pay different unit rates — either more or less depending on when they locked in. Always compare your actual tariff letter with the current price cap to see if you’re overpaying.

⚠️ Note: Rates shown are Ofgem price cap maximums for England, Wales, and Scotland. Northern Ireland energy market is regulated separately and has different rates.

Why Choose My DEWA Bill?

The UK’s most accurate and comprehensive free energy and water bill calculator platform — updated every quarter with official rates

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100% Accurate Rates

All rates sourced directly from official providers. Energy rates from Ofgem’s published price cap documents. Water rates verified from individual company charges schemes and Ofwat filings. Updated quarterly.

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Completely Free

No hidden costs, subscription tiers, or premium features. No email signup or account registration required. Our calculators will remain free permanently — funded by non-intrusive advertising.

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Your Privacy Protected

All calculator inputs are processed locally within your browser. No personal usage data is ever sent to our servers or stored. Fully GDPR compliant. We don’t sell your data to energy brokers or comparison sites.

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Works on All Devices

Fully responsive design tested on iOS, Android, tablets, and all major desktop browsers. Touch-friendly inputs. Calculate your bills anywhere — from the kitchen table or the queue at Tesco.

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Results in Seconds

No page reloads, no server delays. All calculations happen instantly in your browser. Detailed breakdowns show exactly how your bill figure is derived — not just a black-box final number.

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Expert-Backed Guides

Every calculator is paired with comprehensive educational guides. Learn how bills are structured, what standing charges really are, how the price cap works, and which money-saving steps actually make a difference.

📊 Current UK Utility Rates — January to March 2026

Official Ofgem price cap rates and Ofwat-verified water company charges for the current billing period

⚡ Energy Rates (Ofgem Price Cap)

Electricity Unit Rate27.69p/kWh
Electricity Standing Charge54.75p/day
Gas Unit Rate6.33p/kWh
Gas Standing Charge29.82p/day
Typical Annual Dual Fuel£1,758/year
Quarter update: Price cap increased 0.2% from 1 January 2026. Based on typical household using 2,700 kWh electricity and 11,500 kWh gas per year. VAT at 5% included. Valid until 31 March 2026 — next review April 2026.

💧 Water Rates (2025-26 Average)

UK Average Water Bill£603/year
Thames Water (metered)£1.88/m³ + £70
Yorkshire Water£602/year avg
Southern Water£703/year avg
Increase vs 2024+26% (+£130)
2025-26 increases: Average UK water bill up 26% from £473 (2024) to £603. Thames Water up 31%, Southern Water up 47%, Anglian Water up 29%. Driven by Ofwat-approved £96bn infrastructure investment programme over 5 years.

💡 12 Proven Ways to Reduce Your Energy Bills in 2026

With bills still at historically high levels, these practical steps can save the average household £200–£800 per year without major investment.

1

Switch to a Smart Meter

Smart meters eliminate estimated bills and give you real-time energy use data. Households with smart meters typically use 3–5% less energy simply by seeing their costs update live. Request a free installation from your supplier — it takes around 1 hour.

2

Lower Your Thermostat by 1°C

Dropping your heating thermostat from 21°C to 20°C typically saves around £100–£145/year on gas bills. The savings are immediate and require no upfront cost. Use your boiler’s own thermostat, not just the room thermostats, for best results.

3

Switch Off Standby Appliances

Appliances on standby cost UK households an average of £55/year. TVs, set-top boxes, phone chargers, and games consoles are the biggest culprits. Plug-in standby saver strips make it easy to cut power to multiple devices at once.

4

Wash Clothes at 30°C

Switching from 40°C to 30°C wash cycles uses around 40% less electricity per wash. Modern detergents are just as effective at lower temperatures. For a household running 4 washes per week, this saves approximately £20–£35/year.

5

Use a Water Meter

If you have fewer people in your home than bedrooms, a metered water supply will almost certainly save money. Free installation by all water companies. Two-year free trial with guaranteed rollback. Single occupants in 2-bed properties typically save £150–£300/year.

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Claim All Eligible Benefits

Winter Fuel Payment (£200–300), Warm Home Discount (£150), Cold Weather Payments (£25/week), and ECO4 grants for insulation can together save qualifying households £500–£1,500/year. Many eligible people never claim. Check every scheme every year.

7

Check If You’re on the Best Tariff

Fixed-rate tariffs are available below the current price cap from several suppliers. Compare via Ofgem-accredited comparison sites. Even a modest 5p/kWh saving on electricity equals around £135/year for a typical household — with no lifestyle change required.

8

Draught-Proof Your Home

DIY draught-proofing of doors, windows, letterboxes, and keyholes costs £50–100 in materials and can save £60–£160/year on heating. Loft insulation (free under ECO4 for many households) saves an average £300/year and has a payback period of under 2 years if self-funded.

9

Use Appliances During Off-Peak Hours

If you’re on a time-of-use tariff like Octopus Agile or Economy 7, running dishwashers, washing machines, and EV chargers overnight or at off-peak times can reduce electricity costs by 30–60% on those loads. Use delay timer functions built into modern appliances.

10

Bleed Radiators and Service Boiler

Trapped air in radiators reduces heating efficiency, meaning your boiler works harder and uses more gas. Bleeding radiators costs nothing. An annual boiler service (around £80–£120) ensures your boiler runs at peak efficiency — older inefficient boilers can waste up to 35% of fuel.

11

Switch to LED Lighting

Replacing all remaining halogen or incandescent bulbs with LED equivalents costs approximately £50–100 upfront and saves around £40–65/year on electricity. LEDs last 10–25 times longer than traditional bulbs, eliminating replacement costs entirely.

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Use Our Calculators to Find Your Biggest Costs

The most effective way to reduce your bills is to understand exactly where your energy goes. Our free kWh calculator breaks down the cost of each appliance so you can prioritise the biggest changes. Most households find 2–3 “surprise” items driving most of their bill.

🔍 Smart Meters & Switching — What You Need to Know

Two of the most effective ways to take control of your energy costs — and both are free

📟 Should I Get a Smart Meter?

Smart meters are free to install and replace your traditional gas and electricity meters. They send readings directly to your supplier (ending estimated bills forever) and provide near real-time usage data via an in-home display. Since mid-2024, all new meter installations in the UK must be SMETS2 smart meters, which work across suppliers when you switch.

The honest case for smart meters:

• Eliminates estimated bills — you pay only for what you actually use
• In-home display shows live energy costs — proven to reduce usage by 3-5%
• Required to access time-of-use tariffs (Octopus Agile, Economy 7 EV, etc.)
• Free installation — request via your current energy supplier’s website
• SMETS2 generation now works seamlessly when you switch suppliers
• Compatible with most solar panel and battery storage systems

Smart meters don’t save money automatically — but they give you the visibility to make better decisions. For households interested in time-of-use tariffs (where overnight electricity can cost 5–8p/kWh vs the daytime 27.69p), a smart meter is essential.

🔄 How to Switch Energy Supplier in 2026

The switching process in 2026 is faster and simpler than ever. Under the Fast and Reliable Switching programme, most switches complete within 2–3 working days. You never lose supply — the physical energy infrastructure doesn’t change, only who bills you.

Steps to switch energy supplier:

• Find your current unit rates and standing charges on a recent bill
• Compare tariffs on Ofgem-accredited sites: Uswitch, MoneySuperMarket, or Compare the Market
• Check for exit fees on your current tariff — usually only on fixed-rate deals
• Choose a new tariff and initiate the switch — the new supplier handles everything
• Provide meter readings on switch day to ensure accurate final billing
• Your final bill from old supplier arrives within 6 weeks — check it carefully

Important: You have a 14-day cooling-off period after initiating a switch. If energy prices drop significantly (as they did in 2023), you can use this window to cancel and seek a better deal. Never feel locked in during the cooling-off period.

🎁 Government Support Schemes — You Could Save £1,000s

Millions of eligible UK households fail to claim financial help available to them every year. Check all three main schemes — you may qualify for more than one.

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Winter Fuel Payment

£200 – £300

Annual tax-free payment to help with heating costs during winter. Available to those aged 66 or over by 21 September 2025, with annual income below £35,000 or receiving Pension Credit. £200 for those under 80; £300 for those aged 80 or over. Paid automatically in November or December — you don’t need to apply if you already receive the State Pension.

Check Eligibility
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Warm Home Discount

£150

A one-off £150 discount applied directly to your electricity bill — not a cash payment. For low-income households receiving Pension Credit Guarantee Credit (Core Group 1) or certain other means-tested benefits with a high energy cost home (Core Group 2). Applied automatically between October and March. If you think you qualify but don’t receive it, contact your supplier directly.

Learn More
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Cold Weather Payment

£25 per 7 days

Automatic £25 payment for every 7-day period when your local area’s average temperature is 0°C or below, or forecast to be 0°C or below for 7 consecutive days. Multiple payments are possible in a cold winter. Paid to those receiving certain benefits including Pension Credit, Income Support, ESA, or Universal Credit with a disability or health condition element.

Check Your Postcode

⚠️ 880,000 People Are Missing Out on £3,900/Year — Are You One?

Government data shows that 880,000 eligible pensioners are not claiming Pension Credit — missing an average of £3,900/year in direct payments. Claiming Pension Credit automatically unlocks: Winter Fuel Payment + Warm Home Discount + free TV licence if you’re 75+ + Council Tax reduction + NHS dental, optical, and prescription help. If your weekly income is under £218.15 (single) or £332.95 (couple), call 0800 99 1234 or use our eligibility checker today. This is money you’re entitled to — it’s not charity.

Check Pension Credit Now — Takes 5 Minutes

⚡ UK Energy & Water Suppliers

Rates, contact details, and tariff guides for all major UK energy and water companies — updated for 2025-26

🔥 British Gas
⚡ EDF Energy
🐙 Octopus Energy
🌿 E.ON
🌀 OVO Energy
🏴󠁧󠁢󠁳󠁣󠁴󠁿 Scottish Power
💧 Thames Water
💧 Yorkshire Water
💧 United Utilities
💧 Severn Trent
💧 Southern Water
💧 Anglian Water

❓ Frequently Asked Questions About UK Energy Bills

Answers to the most searched questions about electricity, gas, and water bills in the UK — updated for 2026

What is the Ofgem energy price cap and how does it affect my bill?
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The Ofgem energy price cap is a limit on the unit rates and standing charges that suppliers can charge customers on standard variable (default) tariffs. It’s not a cap on your total bill — it’s a cap on the price per unit of energy. For January to March 2026, the cap sets electricity at 27.69p/kWh with a 54.75p/day standing charge, and gas at 6.33p/kWh with a 29.82p/day standing charge. For a typical household using 2,700 kWh electricity and 11,500 kWh gas, this equals £1,758/year. If you use more energy than the “typical household” benchmark, your total bill will be higher — the price cap protects you from excessive rates, not from high consumption costs. The cap is reviewed every quarter: January, April, July, and October.
Why are my energy bills still so high in 2026?
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Energy bills remain at elevated levels in 2026 compared to pre-2021 norms, primarily because global wholesale gas prices — which peaked in 2022 — have stabilised at a level higher than pre-crisis prices. The UK imports significant amounts of gas, so international price movements directly affect domestic bills. Additionally, standing charges have increased as suppliers pass on network maintenance costs, and VAT (5%) continues to apply to all energy bills. The January 2026 price cap of £1,758/year is only marginally higher than Q4 2025 (£1,755), representing a 0.2% increase — the market has largely stabilised, but a return to pre-2021 bills (around £1,000–£1,100/year) is not currently forecast.
What is a standing charge on an energy bill and why do I have to pay it?
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A standing charge is a fixed daily fee charged regardless of how much energy you use. It covers the cost of maintaining the gas and electricity infrastructure — pipes, cables, meters, billing systems — that delivers energy to your property. Under the January 2026 price cap, the maximum electricity standing charge is 54.75p/day (£199.84/year) and the gas standing charge is 29.82p/day (£108.84/year). Combined, standing charges alone can account for over £300 of your annual energy bill. Critically, this means that even if you reduce your consumption significantly, you can’t eliminate this portion of your bill. Some suppliers offer tariffs with lower standing charges but higher unit rates — which suits low-usage households. Use our Standing Charge Calculator to compare options.
How do I know if I’m on the best energy tariff?
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Check your most recent energy bill or your online account to find your current unit rate and standing charge. Compare these against the Ofgem price cap figures for the current quarter. If you’re on a standard variable tariff, you should be paying at or below the price cap rates. If you’re paying more, contact your supplier immediately. To find genuinely cheaper options, use an Ofgem-accredited comparison site (Uswitch, MoneySuperMarket, Compare the Market) and filter by annual cost for your consumption level. Fixed-rate tariffs are currently available slightly below the price cap from several suppliers. Consider time-of-use tariffs if you have a smart meter and flexibility to shift usage to evenings or overnight.
Why are water bills up 26% in 2025 and will they keep rising?
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UK water bills rose an average of 26% from £473 in 2024 to £603 in 2025-26. This was approved by the water industry regulator Ofwat as part of the PR24 price review, which allowed water companies to raise bills to fund a £96 billion infrastructure investment programme over five years. The investment is intended to address leaking pipes (some losing 25%+ of water before it reaches households), sewage overflow incidents (which caused significant public concern in 2023-24), and environmental improvement targets set by regulators. Some companies saw larger increases than others: Thames Water was permitted to raise bills 31%, Southern Water by 47%. Ofwat’s projections suggest bills will continue rising above inflation for the duration of the five-year investment programme, with some further increases expected in 2026-27 and 2027-28.
Am I eligible for the Warm Home Discount in 2025-26?
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The Warm Home Discount provides a £150 one-off reduction on your electricity bill. Eligibility falls into two groups. Core Group 1: You automatically receive the discount if you’re in receipt of Pension Credit Guarantee Credit — no application needed. Core Group 2: You may be eligible if you receive certain other means-tested benefits (such as Universal Credit, Income-related ESA, or Housing Benefit) AND your property is assessed as having high energy costs. CORE Group 2 eligibility is assessed by DWP — if you qualify, you should receive a letter. Your energy supplier must participate in the scheme; if they’re not on the approved list, you cannot receive the discount from them even if you are eligible. The scheme runs from October to March each year. Check directly with your supplier if you believe you qualify but haven’t heard anything.
Should I get a water meter installed?
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In most cases, if your household has fewer occupants than bedrooms, installing a water meter will save you money. The rule of thumb is straightforward: if you have 1–2 people in a 3-bed property, a meter is almost certainly cheaper. With water bills now averaging £603/year, the savings for single occupants in average-sized properties can easily reach £150–£400/year. All water companies offer free meter installation. Most importantly, there is a mandatory two-year free trial period — if your metered bill is higher than your previous rateable value bill at any point during those two years, you can switch back to rateable value billing at no cost. This makes trialling a water meter completely risk-free. Use our Water Meter vs Rateable Value calculator to estimate your specific annual saving before requesting installation.
What is a kWh and how do I calculate my energy usage?
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A kilowatt-hour (kWh) is the standard unit of energy measurement used on UK energy bills. It represents the amount of energy consumed by a 1,000-watt (1 kW) appliance running for 1 hour. To calculate any appliance’s energy consumption: multiply its wattage by hours used per day, then divide by 1,000 to get kWh. Example: a 2,500W electric oven running 30 minutes/day uses 2,500 × 0.5 ÷ 1,000 = 1.25 kWh/day, costing 1.25 × 27.69p = 34.6p per day or approximately £126/year. Your electricity meter shows cumulative kWh consumed since installation. To calculate recent usage, subtract last month’s reading from this month’s, then multiply by your unit rate. Our kWh Calculator automates all of this and covers 50+ common household appliances.
Is Octopus Energy really cheaper than British Gas?
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It depends on your tariff, usage, and location. On standard variable tariffs, all major suppliers are constrained by the Ofgem price cap — so the rates are very similar or identical. The real differences emerge on fixed-rate and time-of-use tariffs, where Octopus Energy has historically offered some of the most competitive deals, particularly for EV owners and households with smart meters willing to shift usage to off-peak periods. Octopus Agile and Octopus Go tariffs offer significantly lower unit rates at certain times of day. British Gas tends to offer more services (boiler cover, HomeServe integration) and a larger physical network. For pure bill cost comparison at your actual consumption level, always use a price comparison site and input your exact annual kWh usage — don’t rely on “typical household” estimates.
What is dual fuel and is it cheaper than separate gas and electricity suppliers?
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Dual fuel means having both your gas and electricity supplied by the same company. It used to offer guaranteed discounts of £30–50/year compared to having separate suppliers. In 2026, this is less consistently true — some suppliers offer dual fuel discounts, others don’t, and the competitive landscape means the cheapest deal is often to take the best available tariff for each fuel type separately. The main advantages of dual fuel are administrative simplicity (one supplier, one bill, one account) and the occasional bundled discount. The main advantage of separate suppliers is flexibility — you can independently optimise each fuel. When comparing deals, always run the calculation both ways: dual fuel total vs best gas + best electricity separately.
How accurate are your UK bill calculators?
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Our calculators use rates sourced directly from official publications: Ofgem’s quarterly price cap determination documents for energy rates, and individual water company charges schemes (as submitted to Ofwat) for water rates. Energy calculator accuracy is typically within £1–5 of official calculations for standard variable tariff customers. Water calculator accuracy depends on your specific company, your usage, and whether you’re metered or on rateable value — estimates are accurate to within 5–10% for the majority of households. We update rates within 48 hours of official announcements. The most common source of discrepancy is using estimated rather than actual meter readings — always input your real meter reading for the most accurate results.
What ECO4 grants are available to help with insulation and heating in 2026?
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The Energy Company Obligation 4 (ECO4) scheme runs until March 2026 and provides fully funded insulation and heating upgrades for eligible low-income households. Eligibility broadly covers households receiving means-tested benefits (Universal Credit, Pension Credit, Income Support, ESA, Child Tax Credit, Working Tax Credit) OR households with low energy efficiency ratings (EPC D or below) on low incomes. Funded measures include: loft insulation (saves around £300/year), cavity wall insulation (saves £275–£400/year), solid wall insulation (saves £450–£750/year), first-time central heating, and boiler replacements. The full grant value can be several thousand pounds. Apply through your energy supplier’s ECO team, a government-approved installer, or via the Simple Energy Advice service at simpleenergyadvice.org.uk. With ECO4 ending in March 2026, if you think you might qualify, act immediately.
What happens if I can’t pay my energy bill?
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If you’re struggling to pay your energy bill, contact your supplier immediately — before the debt builds up. Under Ofgem’s rules, all suppliers must offer a range of support options. These include payment plans based on what you can actually afford, a debt repayment plan added to your standing charge, a prepayment meter (though suppliers cannot force a vulnerable customer onto one), the Priority Services Register for additional support if you’re elderly, disabled, or chronically ill, and access to their hardship fund or trust fund grants (many suppliers have these). Never ignore energy debt — it accrues interest and enforcement options are more limited in energy than other debts, but prolonged non-payment can lead to disconnection. You can also contact Citizens Advice (0800 144 8848), which provides free, independent advice. National Energy Action (NEA) also offers support and can help identify unclaimed benefit entitlements that might resolve the underlying affordability issue.
Do I need to register to use your calculators?
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No registration, sign-up, or personal information is required. All calculators on My DEWA Bill work instantly — open the page, enter your details, get your result. Your inputs are processed entirely within your browser and are never transmitted to our servers or stored. We don’t ask for your email address, postcode, or any personal data to access the calculators. There are no premium features or paid tiers — everything is free, permanently. This is a deliberate design choice: we believe accurate bill calculation information should be accessible to everyone without friction. If you find our tools useful, you can bookmark the site for next quarter when the price cap is reviewed again.
What is the average UK electricity and gas bill per month in 2026?
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Based on the January 2026 Ofgem price cap, the average UK monthly energy bills are approximately: Electricity alone: £78.96/month (£947.47/year for typical 2,700 kWh usage). Gas alone: £70.55/month (£847 + standing charge for typical 11,500 kWh usage). Combined dual fuel: £146.50/month (£1,758/year). However, monthly bills vary significantly by season — winter gas bills can be 3–4x higher than summer months. Most energy suppliers allow you to pay a consistent monthly direct debit amount (based on annual usage divided by 12) to smooth out this seasonality, which means you’ll be in credit in summer and draw it down in winter. For water: the average UK household pays £50.25/month (£603/year), though this is billed either quarterly or annually by most water companies rather than monthly.

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