Bills & Utilities
UK Gas Meter Reading Calculator
Enter previous and current gas readings, meter type, calorific value, correction factor, and your gas rate to estimate kWh and cost.
Inputs
Results
Useful next checks
- Check the inputs before relying on the result.
- Try a second scenario to compare outcomes.
- Read the guide below for context.
# UK Gas Meter Reading Calculator
Convert UK gas meter readings into kWh and estimate the cost using your gas unit rate and standing charge.
What this calculator does
Gas meters usually record volume, while bills charge energy in kWh. This calculator turns metric or older imperial gas meter readings into kWh using the standard UK conversion method, then applies your tariff rates.
How it works
Subtract the previous reading from the current reading to find units used. Metric meters use cubic metres directly. Imperial meters are commonly read in hundreds of cubic feet, so the calculator converts them to cubic metres first.
The kWh formula is:
`cubic metres x calorific value x correction factor / 3.6`
The cost estimate is:
`kWh x pence per kWh / 100 + daily standing charge x days / 100`
Example calculation
For a metric meter advance of 100 m3, calorific value 39.5, and correction factor 1.02264, the estimated usage is about 1,122 kWh before applying the unit rate.
How to use the result
Use this to check whether a gas reading looks plausible, estimate a bill between statements, or understand why the number on a gas meter is not the same as the kWh number on a bill.
Assumptions and limitations
The default calorific value is a planning value. Your bill may show a different average calorific value for the billing period. Use the value printed on your supplier bill when you need a closer estimate.
FAQs
Why is gas billed in kWh?
The meter records gas volume, but billing is based on the amount of energy in that gas. The calorific value accounts for energy content.
What is the correction factor?
The correction factor adjusts the measured gas volume for temperature and pressure. UK bills commonly show a factor around 1.02264.
Is my meter metric or imperial?
The meter face should state cubic metres or cubic feet. Newer meters are generally metric, but older imperial meters still exist.
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Frequently asked questions
Why is my gas meter not already in kWh?
Gas meters record gas volume. Suppliers convert that volume into kWh using calorific value, correction factor, and a kWh conversion divisor.
Should I use the calorific value from my bill?
Yes. The default is a reasonable planning value, but your bill value is better for checking a specific statement.