Gas usage cost calculator UK
Estimate a gas bill from billed kWh, your unit rate and daily standing charge. Check the formula, worked example and limits before using your own figures.
Enter your figures
Modelled gas bill
Inputs changed. Select Calculate result to update your estimate.
Use your actual figures. Any prefilled price, fee, rate or return is an editable illustration, not a current product quote. No arrears, credits or adjustments. Prefilled tariff figures are a dated GB reference, not a Northern Ireland or universal rate; use your actual VAT-inclusive bill prices.
How the gas usage cost calculator uk works
Bill = gas kWh × unit price + days × standing charge, converted from pence to pounds.
UK data and rules
October–December 2026 data · Checked 16 October 2026. Rules are a dated snapshot, not a live feed.
Read about data coverage and updates
Worked example: gas usage cost
This illustration uses the calculator’s example inputs. It is not a quote or a recommended financial decision.
- Gas energy (kWh)
- 1,000
- Gas unit rate (pence per kWh)
- 7.97
- Standing charge (pence per day)
- 29.68
- Bill days
- 30
Modelled gas bill: £88.60
Bill = gas kWh × unit price + days × standing charge, converted from pence to pounds.
Gas usage cost: questions answered
What does the gas usage cost calculation include?
Bill = gas kWh × unit price + days × standing charge, converted from pence to pounds. Use your actual figures. Any prefilled price, fee, rate or return is an editable illustration, not a current product quote. No arrears, credits or adjustments. Prefilled tariff figures are a dated GB reference, not a Northern Ireland or universal rate; use your actual VAT-inclusive bill prices.
Using your result
Example inputs are a starting point. Replace them with your figures and select Calculate result. Results are rounded for display; calculations use unrounded values.
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