Two-Stroke Fuel Mix Calculator
Calculate the correct amount of two-stroke oil for dirt bikes, ATVs, chainsaws, trimmers, and other premix engines.
Always use the fuel-to-oil ratio recommended by your engine manufacturer.
Calculate Your Mix
Enter your fuel amount
Two-Stroke Oil Mix Chart
Common two-stroke fuel ratios and the amount of oil needed for several gasoline quantities.
| Ratio | 1 Gallon | 2 Gallons | 3 Gallons | 5 Gallons |
|---|---|---|---|---|
| 20:1 | 6.4 oz | 12.8 oz | 19.2 oz | 32 oz |
| 25:1 | 5.12 oz | 10.24 oz | 15.36 oz | 25.6 oz |
| 32:1 | 4 oz | 8 oz | 12 oz | 20 oz |
| 40:1 | 3.2 oz | 6.4 oz | 9.6 oz | 16 oz |
| 50:1 | 2.56 oz | 5.12 oz | 7.68 oz | 12.8 oz |
| 60:1 | 2.13 oz | 4.27 oz | 6.4 oz | 10.67 oz |
Two-Stroke Oil per Liter
For users measuring gasoline in liters, these common ratios provide a quick reference.
32:1
31.25 mL oil per liter of gasoline.
40:1
25 mL oil per liter of gasoline.
50:1
20 mL oil per liter of gasoline.
60:1
16.67 mL oil per liter of gasoline.
How to Mix Two-Stroke Fuel
Check the manufacturer's ratio
Confirm the correct gasoline-to-oil ratio for your specific engine. Common ratios include 32:1, 40:1, 50:1, and 60:1.
Measure the gasoline
Measure the amount of gasoline you intend to mix using an appropriate fuel container.
Measure the oil
Measure the calculated amount of two-stroke oil accurately rather than estimating.
Combine and mix
Combine the gasoline and oil according to the manufacturer's recommended mixing procedure.
Two-Stroke Fuel Mix Questions Explained
What does a 50:1 fuel mix mean?
A 50:1 ratio means 50 parts gasoline to 1 part two-stroke oil by volume. Always use the ratio recommended by the engine manufacturer.
How much oil do I add to 1 gallon at 50:1?
One U.S. gallon of gasoline at 50:1 requires approximately 2.56 fluid ounces of two-stroke oil.
How much oil is needed for 5 gallons at 50:1?
Five U.S. gallons at 50:1 requires approximately 12.8 fluid ounces of two-stroke oil.
How much oil goes into 1 liter at 50:1?
A 50:1 mixture uses 20 mL of oil for every 1 liter of gasoline.
Is 40:1 richer than 50:1?
Yes. A 40:1 mixture contains more oil per amount of gasoline than a 50:1 mixture. Use the manufacturer's specified ratio.
What happens if I use the wrong ratio?
Too little oil can increase friction, heat, and engine wear. Too much oil can increase smoke, deposits, and affect performance.
What ratio does my dirt bike need?
There is no universal ratio for every two-stroke engine. Always follow the manufacturer's recommendation.
How long does mixed two-stroke fuel last?
Fresh fuel is generally preferred for best performance. Storage life depends on the gasoline, oil, container, storage conditions, and fuel stabilizer.
More MechanixMatrix Tools
This calculator provides mathematical calculations for gasoline-to-oil ratios. It does not determine the correct ratio for a specific engine. Always follow the manufacturer's instructions for your dirt bike, ATV, chainsaw, trimmer, or other two-stroke engine.