UK Gas Bill Calculator

Introduction

The UK Gas Bill Calculator converts gas meter readings into estimated kWh and bill cost using unit rate, standing charge, billing days, and VAT. It helps compare your own reading-based estimate with a supplier bill.

About this uk gas bill tool

Gas meters measure volume, while bills charge for energy. That means readings need conversion using meter type, correction factor, and calorific value before the unit rate can be applied. The calculator exposes those steps so the final charge is easier to understand.

How this tool works

Enter previous and current readings, choose metric or imperial meter type, and adjust calorific value or correction factor if your bill shows different values. Add the unit rate, standing charge, billing days, and VAT rate to estimate the total.

1. Enter the previous and current gas meter readings, or enter the number of units used.
2. Choose metric or imperial meter units and adjust the calorific value if your bill shows a different figure.
3. Add the gas unit rate, daily standing charge, billing days, and VAT rate to estimate the bill total.

When to use this tool

Use it after submitting a meter reading, checking an estimated bill, or comparing winter and summer usage. For exact billing, use the figures printed by your supplier because calorific value, tariff dates, VAT, and adjustments can vary.

Good to know

• Metric gas meters are billed using units x correction factor x calorific value / 3.6. Imperial meters also convert hundreds of cubic feet to cubic metres.
• Use your supplier's bill for the exact calorific value, tariff rates, VAT treatment, and any additional charges.