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Household Bills & Lifestyle2 min check
Energy Bill Calculator
Step 1 of 10%
How it works
Annual cost = (kWh × p per kWh ÷ 100) + (standing charge p/day × 365 ÷ 100). Add gas and electricity. Standard credit (paying on the bill) adds about 6% to direct-debit rates.
Worked example
2,700 kWh elec at 27p + 60p/day standing + 11,500 kWh gas at 6.5p + 32p/day → £729 + £219 + £747.5 + £116.8 ≈ £1,812/year.
Who should use this
- •Households comparing tariffs
- •Anyone budgeting after a price cap change
- •Tenants splitting bills
Common mistakes
- ×Forgetting standing charges
- ×Mixing pence and pounds (rates are in pence per kWh)
- ×Using monthly figures instead of annual kWh
Frequently asked questions
Where do I find my unit rate?▾
On any recent bill or your online account — listed as 'unit rate' in p/kWh and 'standing charge' in p/day.
How is the price cap set?▾
Ofgem updates the cap every 3 months based on wholesale costs, network charges and supplier margins.
Is a fixed tariff cheaper?▾
Sometimes — when wholesale prices are expected to rise. Check the fix vs current cap and any exit fees.