Gas Meter Readings Look Wrong — Here’s Why

If your gas meter readings look wrong, don’t panic. It’s one of the most common smart meter complaints in the UK — and in most cases there’s a straightforward explanation. Here’s how to work out what’s actually happening.

Five reasons your gas meter readings might look wrong

1. Your meter is displaying in different units

This is the most common cause of confusion. Gas meters measure usage in either cubic metres (m³) or hundreds of cubic feet (ft³) — but your bill is always shown in kilowatt hours (kWh). The conversion involves a multiplier, so the raw number on your meter will never match your bill directly.

This isn’t a fault. It’s just how gas metering works in the UK.

→ Use our gas meter reading to kWh calculator to convert your reading instantly

2. Your supplier has been using estimated readings

If your smart meter hasn’t been communicating automatically, your supplier may have been estimating your usage. When a real reading eventually comes through, it can look dramatically different — either much higher or lower than previous bills.

Check your bill for an “E” next to any reading. That means it was estimated, not actual.

3. There’s been a meter replacement

When a meter is swapped out, the new meter starts from zero. If the opening read wasn’t recorded correctly, or your supplier hasn’t linked the old and new meter properly, your readings can appear to jump or reset unexpectedly.

→ Gas meter replaced — why your bill changed

4. Your meter is on the wrong rate

Some properties have two-rate meters (day and night rates). If your meter is recording on the wrong rate, or your supplier is applying the wrong tariff multiplier, your readings will look off even if the meter itself is working perfectly.

5. There’s a genuine meter fault

Less common, but it does happen. Smart meters can develop faults that cause them to over or under-record usage. Signs include readings that jump suddenly with no change in your behaviour, or a display that shows inconsistent numbers day to day.

If you suspect a fault, you have the right to request a meter accuracy test. Your supplier must carry this out — and if the meter is found to be faulty, they must recalculate your bills.

How to check if your reading is actually wrong

Before contacting your supplier, do this first:

Take a manual reading directly from your meter display
Note whether it’s showing m³ or ft³ (usually printed near the display)
Convert it to kWh using our calculator
Compare that figure to what’s on your bill

If the numbers don’t match after conversion, you have grounds to query the bill.

Convert your reading now — gas meter reading to kWh calculator →

What to do if your reading is genuinely wrong

Start by contacting your supplier with your manual reading and ask them to reconcile your account. Keep a record of every reading you take — date, time and the exact figure shown on the display.

If your supplier isn’t responding or you believe you’ve been overbilled, use the Bill Checker to understand what you should actually owe.

Check your bill figures with the Bill Checker →

If you’ve already tried to resolve it and gotten nowhere, a formal complaint is your next step.

Generate a complaint letter in minutes →

Not sure what type of problem you have?

Run a quick Health Check and we’ll help you identify what’s going wrong and what to do next.

Start your free Health Check →

Related help:

All advice on SmartMeterHelp is independent. We’re not affiliated with any energy supplier.