PetrolCalculator

Fuel calculator

How Much Petrol Is Left in My Car?

Estimate remaining petrol from dashboard range and UK MPG.

Use this calculator

Enter the dashboard’s estimated miles remaining and UK MPG.

What your result means

This estimates remaining petrol from the dashboard’s estimated miles remaining and the UK MPG entered. Dashboard range is itself an estimate, so this is not a replacement for the fuel gauge.

Worked example

Using 100 dashboard miles remaining and 45 UK MPG:

UK gallons remaining
2.22
Estimated petrol remaining
10.1 litres

The quantity changes if the dashboard range or actual MPG changes.

Formula

UK gallons=Miles remainingUK MPG\text{UK gallons}=\frac{\text{Miles remaining}}{\text{UK MPG}}
Litres=UK gallons×4.54609\text{Litres}=\text{UK gallons}\times4.54609

Helpful questions

Is this the same as a fuel gauge?

No. It turns an estimated dashboard range into an estimated fuel quantity; use the vehicle’s gauge and handbook as the primary reference.

Why might the estimate differ?

Dashboard range and real MPG both change with driving conditions, terrain, temperature, traffic and driving style.

Can miles remaining be zero?

Yes. Zero remaining miles gives an estimated zero litres in this calculation, but it should not be taken as advice to run a vehicle empty.

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