2-cycle premix calculator

2-Stroke Fuel Mix Calculator

Work out the petrol and 2-stroke oil quantities for the mix ratio specified for your engine. Calculate from a petrol amount or reverse-calculate from a target final mix volume.

See how it works Privacy and data

2 Stroke Fuel Mix Calculator app artwork — Fuel and oil quantities, clearly separated.

Mix calculations made clear

Choose the ratio from your engine manual, enter a volume, and read the petrol and oil amounts separately.

Use common or custom ratios

Select a preset or enter the petrol-to-oil ratio recommended by your engine manufacturer.

25:1
32:1
40:1
50:1
60:1

Calculate both directions

Start with the amount of petrol, or enter the final premix volume you want to make.

Final volume ÷ (ratio + 1) = oil

Use the units you measure with

Work in litres, millilitres, US gallons, or US fluid ounces. Small oil quantities stay readable in the result.

Privacy and support

The calculator does not need an account. Its saved mix inputs stay on your device. See the privacy policy for advertising and data details.