Gas & Electricity Bill Calculator UK
Calculate your combined gas and electricity bills with our free dual fuel calculator. Get accurate estimates using current Ofgem price cap rates or your own tariff details.
🔥Gas Bill Calculator
Check your gas meter or bill
Price cap: 6.24p/kWh
Price cap: 31.41p/day
⚡Electric Bill Calculator
Check your electric meter or bill
Price cap: 24.50p/kWh
Price cap: 60.10p/day
Combined Energy Bill
Current UK Gas & Electric Rates (2026)
🔥Gas Rates (Price Cap)
Based on 11,500 kWh typical gas usage
⚡Electricity Rates (Price Cap)
Based on 2,700 kWh typical electric usage
Combined Dual Fuel Bill
Typical Gas & Electric Usage by Property
| Property Type | Gas (kWh/year) | Electric (kWh/year) | Monthly Bill | Annual Bill |
|---|---|---|---|---|
| 1 Bedroom Flat | 6,000 | 1,800 | £95 | £1,140 |
| 2 Bedroom House | 8,000 | 2,400 | £123 | £1,476 |
| 3 Bedroom House | 11,500 | 2,700 | £155 | £1,860 |
| 4 Bedroom House | 15,000 | 3,500 | £195 | £2,340 |
| 5+ Bedroom House | 18,000 | 4,200 | £235 | £2,820 |
* Based on Ofgem price cap rates. Excludes water bills. Actual usage varies by insulation, appliances, and household habits.
Dual Fuel vs Single Fuel Tariffs
✅ Dual Fuel Benefits
- • Single supplier: One bill, one point of contact
- • Dual fuel discounts: Often 5-10% cheaper
- • Easier switching: Compare one deal instead of two
- • Bundle offers: Fixed rate deals across both fuels
- • Simplified management: One account, one payment
- • Customer service: Single helpline for all issues
❌ Single Fuel Benefits
- • Best individual rates: Cherry-pick cheapest for each fuel
- • Specialist suppliers: Green energy or regional providers
- • Risk spreading: Not tied to one company's prices
- • Flexibility: Switch fuels independently
- • Negotiation power: Play suppliers against each other
- • Exit flexibility: Leave poor service without both fuels
Recommendation: Dual fuel is typically better for most households due to convenience and dual fuel discounts. Only consider separate suppliers if you find significantly better individual rates (£100+ annual difference).
How to Reduce Gas & Electric Bills
🔥Reduce Gas Bills
- • Lower thermostat by 1°C (save 6-8%)
- • Service boiler annually
- • Install smart thermostat
- • Improve home insulation
- • Use timer on heating
- • Close curtains at dusk
- • Draught proof doors/windows
- • Only heat rooms you use
⚡Reduce Electric Bills
- • Switch to LED bulbs
- • Unplug devices on standby
- • Use appliances at off-peak times
- • Air dry clothes vs tumble dryer
- • Fill dishwasher before running
- • Use energy efficient appliances
- • Install smart plugs and timers
- • Consider solar panels
Gas & Electric Calculator FAQ
Is dual fuel cheaper than separate suppliers?
Generally yes - most suppliers offer 5-10% dual fuel discounts. However, check individual rates as sometimes the best gas supplier and best electricity supplier are different companies, potentially saving more overall.
How do I convert gas meter readings to kWh?
For metric meters: (Current reading - Previous reading) × Volume correction factor (1.02264) × Calorific value (39.5) ÷ 3.6. Your bill shows the conversion factors, or use your supplier's online calculator.
When do energy prices change?
Ofgem reviews the price cap quarterly (January, April, July, October). Fixed rate tariffs can be offered at any time. Always compare current deals when your fixed term ends to avoid reverting to expensive standard variable rates.
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