Energy Bill Calculator
Estimate your yearly and monthly gas and electricity bill from usage, unit rates and standing charges.
Your result
Updates as you type. Based on 2025/26 UK figures where relevant.
How this is worked out
For each fuel, multiply yearly kWh by the unit rate and add the daily standing charge × 365. Rates default to typical price-cap levels; enter your own from your bill.
Tips
- Find your unit rates and standing charges on your latest bill or in your supplier's app.
- Standing charges are paid every day regardless of usage.
- Always buy materials from the same batch and add a waste allowance for cuts.
Guides for this calculator
- How to Calculate Your Energy Bill in the UK: Step-by-Step Guide
- Your Energy Bill: Common Mistakes, Tips and FAQs
More home and energy calculators
Frequently asked questions
How does the energy Bill Calculator work?
For each fuel, multiply yearly kWh by the unit rate and add the daily standing charge × 365. Rates default to typical price-cap levels; enter your own from your bill.
Where do the default energy prices come from?
They are typical UK price-cap level figures used as a starting point. Replace them with the rates on your own bill for an accurate result.
Do the DIY calculators include waste?
Most include an adjustable waste allowance. 10% is typical; complex layouts may need 15%.
Are the results exact?
They are estimates. Real usage, weather and installation details will change actual costs.
This calculator gives an estimate for general information. It isn't financial, tax, legal or medical advice. Check official figures on GOV.UK or NHS.uk, or speak to a qualified adviser.