Engine & fuel
Boat Fuel, Range & Cost Calculator
Calculate boat fuel range, running time and trip cost using US gallons or liters and your measured consumption per hour.
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2 Stroke Oil Mix Calculator
Calculate how much oil to add to your fuel for a 2 stroke mix at 50:1, 40:1, 25:1 or your engine’s specified ratio.
Your two-stroke mix. Measured right.
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Your inputs
Quick ratios
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Your result
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The ratio means fuel:oil. At 50:1, add 20 ml of oil per litre of fuel. Use the ratio and oil specified by the manufacturer; this tool does not select an engine-specific ratio.
A quick reference
| Fuel | 50:1 (2 %) | 25:1 (4 %) |
|---|---|---|
| 1 L | 20 ml | 40 ml |
| 2 L | 40 ml | 80 ml |
| 5 L | 100 ml | 200 ml |
| 10 L | 200 ml | 400 ml |
| 20 L | 400 ml | 800 ml |
Useful answers
What does a 2% mix mean?
Here, 2% means 20 ml of oil per litre of fuel, or 50:1. The percentage is relative to the fuel volume.
Can I use this for an outboard?
Yes, for an engine that requires premixed fuel. Check its manual: separate oil injection systems may work differently.
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Engine & fuel
Boat Tank Volume Calculator
Calculate boat tank capacity from internal dimensions in inches, feet or centimeters. See results in US gallons and liters.
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