Fuel Mix Ratio (2 Stroke) Calculator

Work out fuel mix ratio (2 stroke) instantly with clear inputs, formula shown and shareable results.

About Fuel Mix Ratio (2 Stroke) Calculator

A ratio quoted as 50 : 1 means fifty parts petrol to one part oil, so the oil volume is the petrol volume divided by 50. Working in millilitres makes the small oil quantities easier to measure.

Formula

Two-stroke mix

oil (ml) = petrol (L) × 1000 / ratio

Worked example

With the default values below, Fuel Mix Ratio (2 Stroke) Calculator returns Two-stroke oil needed of 100.000. Change any input above and every figure here is recalculated in your browser.

Inputs used

Petrol volumeminimum 0 L: 5 L
Fuel to oil ratio (petrol : 1 oil)minimum 1: 50

Results

Two-stroke oil needed: 100.000 ml
Oil in litres: 0.100000 L
Total mixture volume: 5.100000 L
Oil share of the mixture: 1.9608 %

Step by step

1Values used
2Two-stroke mix
3Two-stroke oil needed= 100.000 ml
4Oil in litres= 0.100000 L
5Total mixture volume= 5.100000 L
6Oil share of the mixture= 1.9608 %

Assumptions and limits

The result is derived only from the 2 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 6 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

5 litres at 50 : 1?

5 / 50 = 0.1 litres, that is 100 ml of two-stroke oil.

What happens with too little oil?

The engine loses lubrication and can seize. Always follow the manufacturer's ratio rather than guessing.