Need to act on a gas reading or kWh bill?
If the gas reading, conversion or bill still looks wrong, keep the evidence and check the bill before complaining.
Step 1 of 3
What type of gas meter do you have?
This is printed on the front of your meter. Most UK meters installed after 2000 show cubic metres.
Enter your meter readings
Use the digits before the decimal point on your meter display.
m³
Please enter your previous reading.
m³
Please enter your current reading.
Your tariff details
We use these to estimate your bill. All figures are on your gas bill.
The energy content of your gas. It's printed on the back page of your bill — usually between 37.5 and 43.0. We've pre-filled 39.5 as a UK average.
Pre-filled with the UK average. Check the back of your bill for the exact figure.
p
On your bill under "gas unit rate". Ofgem price cap rate is around 6.24p/kWh.
Please enter your unit rate.
Your daily standing charge multiplied by the number of days in the billing period. Usually shown as a total on your bill.
£
Leave blank to see energy cost only.
Your results
Units used
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Energy used
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Estimated cost (ex. VAT)
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Estimated total (inc. 5% VAT)
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Your supplier uses this formula
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Compare to your actual bill
Enter what your supplier charged you for this period to see if it looks right.
£
✅
Your bill looks correct
The amount your supplier charged is in line with what we'd expect based on your readings and tariff.
⚠️
Small difference — worth checking
There's a minor gap between what you were charged and our estimate. This could be due to rounding or your exact tariff dates. Check the breakdown on your bill.
🚨
Your bill looks higher than expected
There's a significant gap between what you were charged and what we'd expect. This is worth investigating — use the tools below to check and, if needed, raise a formal complaint.
Not sure if your meter is reading correctly?
Run a quick health check to diagnose what's going on with your smart meter.
Start Health Check
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Know your rights — the 5-day rule
Under Ofgem's Guaranteed Standards of Performance (GSOP), your supplier must fix certain smart meter problems within 5 working days. Miss that deadline and you may be owed automatic compensation. Find out more →
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