Gas Usage & Bill Calculator -

Gas Usage & Bill Calculator

Calculate your gas usage and standing charges separately. Once both have been calculated, the calculator will combine them to estimate your total gas cost.

VAT

Domestic gas is normally charged at 5% VAT. If the rates you enter already include VAT, set this to 0%.

Gas Usage Calculator

Enter your meter readings and gas tariff details to calculate how much gas you have used and what that usage costs.

Meter type

Metric meter Meter readings shown in cubic metres (m³) Imperial meter Older meter showing ft³

Meter readings

Previous meter reading

Current meter reading

Gas conversion details

Calorific value

MJ/m³

The calorific value tells us how much energy the gas contains. Use the figure shown on your gas bill where possible.

Volume correction factor Gas changes volume with temperature and pressure. The correction factor adjusts the measured volume to standard conditions.

Gas unit rate

Unit rate

p/kWh

Standing Charges Calculator

Enter your standing charge and the dates that apply to calculate the standing charges for the period.

Standing charge

p/day

Standing charge period

Enter the start and end dates for the period you want to calculate.

Start date

End date

Your Estimated Gas Cost

Complete both calculations above to see your combined estimated gas cost.

Gas usage Not calculated

Standing charges Not calculated

Total including VAT —

Full Calculation Breakdown

See how your gas usage, conversion, standing charges and VAT have been calculated.

Gas usage calculation

1. Meter readings

2. Convert imperial units to cubic metres

Older imperial gas meters normally record gas in hundreds of cubic feet. Each imperial meter unit is approximately 2.83 cubic metres.

2. Apply the calorific value and correction factor

Calorific value tells us how much energy is contained in the gas.

Volume correction factor adjusts the measured gas volume for temperature and pressure.

3. Divide by 3.6

The calculation above gives energy in megajoules (MJ). There are 3.6 megajoules in one kilowatt-hour, so dividing by 3.6 converts the result into kWh.

4. Calculate gas usage cost

Standing charge calculation

1. Calculate the number of days

2. Calculate standing charges

VAT and total

1. Cost before VAT

2. Add VAT

3. Total estimated cost

This calculator provides an estimate. For the closest comparison with your bill, use the calorific value, volume correction factor, unit rate and standing charge shown on your bill or tariff. If the rates you enter already include VAT, set VAT to 0% to avoid adding it twice.

Important Information

Energility provides general information to help you understand energy, household and business costs, services and ways to save money. It is not financial, legal, tax, technical or professional advice.

Prices, tariffs, grants, government schemes, regulations and other information can change. Costs, savings and calculator results are estimates and your actual results may be different.

Before making an important financial decision, signing a contract or carrying out significant work, check the latest information and consider getting advice from a suitably qualified professional where needed.

Energility may receive a commission or other benefit from some links or services. Where this applies, we aim to make it clear. This does not increase the price you pay unless stated otherwise.

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Gas Usage & Bill Calculator