Home Energy Tariff Calculator (UK)
Compare electricity and gas tariffs, estimate annual costs and savings, and switch with confidence. Fast, free and secure for households across England, Scotland and Wales.
- Free to use
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- UK-wide results
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- No spam, no pressure
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- Secure comparison
Calculate your energy tariff
Enter a few details to estimate costs based on today’s available tariffs. You can use your annual kWh usage for the most accurate results, or start with your typical monthly spend.
Why use our calculator?
- Real-world rates including unit rate (p/kWh) and standing charge (p/day)
- Compare fixed, variable and green energy tariffs
- Simple dual fuel or single fuel options
- Quick estimate even if you don’t know your kWh usage
- UK-focused guidance based on Ofgem rules and price cap context
Tip for accurate results
Use your last 12 months’ kWh from your bill or smart meter app. Typical UK households use around 2,700–3,100 kWh electricity and 10,000–12,000 kWh gas per year, but your usage may vary.
Your tariff results
Below is an example layout. Actual tariffs and rates will appear here after you calculate.
Example Supplier • Fixed Saver 12m
- Electricity: 28.5p/kWh • Standing charge: 48p/day
- Gas: 7.2p/kWh • Standing charge: 29p/day
Example Supplier • Flexible Variable
- Electricity: 29.1p/kWh • Standing charge: 51p/day
Example Supplier • Green Fix 12m
- Electricity: 30.2p/kWh • Standing charge: 47p/day
- Gas: 7.5p/kWh • Standing charge: 30p/day
How it works
Three simple steps to find a better energy deal
1) Tell us about your home
Add your postcode, fuel type and usage or spend. You can refine results any time.
2) Compare tariffs
See unit rates, standing charges and estimated annual cost. Filter by fixed, variable or green.
3) Switch with confidence
Complete your switch online in minutes. No engineer visit, no supply interruption.
What is an energy tariff?
In the UK, your energy bill is primarily made up of two elements: the unit rate (the price per kWh you use) and the standing charge (a daily fee to maintain your connection). A tariff defines how these are priced and whether rates are fixed for a period or can change.
Fixed vs variable tariffs
- Fixed tariffs lock in unit rates and standing charges for a set term (e.g., 12 months). They can protect you from price rises but may include exit fees.
- Variable tariffs can go up or down. They usually have no exit fee and often track market changes, including movements in the Ofgem price cap.
- Green tariffs support renewable generation. Many offer 100% renewable electricity; rates vary by supplier.
Tips for an accurate estimate
- Use 12 months’ kWh usage from your bill or smart meter app.
- Select your correct payment method and meter type (standard, Economy 7, prepayment).
- Consider dual fuel discounts if you take both gas and electricity from the same supplier.
Why compare with EnergyPlus
- Clear breakdown of rates and estimated annual cost
- Filter by fixed, variable, green and dual fuel
- Mobile-friendly comparison in minutes
- UK-based support when you need it
Energy tariff calculator FAQs
Answers to common questions about comparing UK gas and electricity
Make sense of your bill: standing charge vs unit rate
Your standing charge is a fixed daily amount you pay to keep your property connected. The unit rate is what you pay for each kWh of energy you use. When comparing tariffs, look at both numbers. A lower unit rate can benefit higher-usage homes, while a lower standing charge may suit lower-usage households such as smaller flats or second homes.
Economy 7 and time-of-use
Economy 7 tariffs offer cheaper night-time electricity and higher day rates. These can be cost-effective if a significant portion of your usage is at night (e.g., storage heating). Smart time-of-use tariffs vary by hour and require a smart meter.
Quick checklist
- Have your latest bill handy
- Note your meter type (standard/E7/prepay)
- Consider fixed vs variable preferences
- Check any exit fees before switching
Ready to find a better energy deal?
Run a quick calculation with your postcode and usage. Compare fixed, variable and green tariffs in minutes.
Disclaimer: The EnergyPlus tariff calculator provides estimates for guidance only and does not constitute advice. Tariffs, rates and availability change frequently. Always check supplier terms and conditions before switching. Great Britain only (England, Scotland, Wales). Northern Ireland is not included.