What this calculator does
2-stroke fuel mix ratio works out oil to add to a volume of petrol for a chosen mix ratio. Enter your own figures above and the answer updates as you type: nothing is fixed in the code, so the result reflects exactly the numbers you supply.
The formula this calculator evaluates is printed under the tool and explained below, so you can check the working by hand or reuse it in a spreadsheet.
The formula
FormulaOil = petrol / ratio (a 50:1 ratio needs 1 part oil to every 50 parts petrol)
The inputs explained
| Field | What to enter |
|---|---|
| Petrol (L) | A number, measured in L. Starts at 5. |
| Ratio (petrol : 1 oil) | A number. Starts at 50. |
Worked examples
Every figure in the tables below is produced by this page’s own calculator at build time, so the numbers and the tool always agree. Select any row to load that scenario.
How the answer changes with petrol
Every other input is held at the calculator’s starting values while petrol varies. Select any row to load that scenario into the calculator.