How much 2-cycle oil do I mix per gallon?
At 50:1 add 2.56 oz of oil per gallon of gas; at 40:1 add 3.2 oz; at 32:1 add 4 oz; at 25:1 add 5.12 oz. The formula is simply 128 ÷ ratio = ounces of oil per gallon.
Calculators
2-Cycle Oil Mix Calculator
Free calculator for 2-stroke oil and gas mix ratios
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A free web calculator that computes the exact amount of 2-stroke oil to add to gasoline for any mix ratio (50:1, 40:1, 32:1, 25:1 and more) in both US and
The story so far
2cycleoilmixcalculator.com is a free reference tool for anyone who needs to mix 2-stroke fuel. The calculator works out the exact amount of oil to add for any fuel amount at any ratio in both US gallons/ounces and metric litres/millilitres. It also provides printable reference charts for common ratios and guidance on which ratio different equipment needs. Every calculation on the site comes from a single formula: oil equals fuel divided by the ratio. The tool runs entirely in your browser with no accounts or paywalls.
Typeset features
- Calculate oil amount for any fuel volume at any mix ratio
- Results in both US and metric units
- Printable mix ratio reference charts
- Bidirectional calculation
- Works in browser with no installation required
- Equipment guidance by manufacturer and class
Pricing
Pricing model: Free
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Questions and answers
What happens if I put too much 2-cycle oil in the mix?
Too much oil makes the engine run rich: it can smoke heavily, foul the spark plug, build up carbon, and lose power. A little extra is far safer than too little, but stick close to the recommended ratio.
Can I use car engine oil in a 2-stroke mix?
No. Two-stroke oil is formulated to be burned with the fuel and is low-ash, so it leaves minimal deposits. Four-stroke motor oil is designed to circulate and be retained, contains additives that do not burn cleanly, and will carbon up the exhaust port, foul the plug and eventually damage the engine.
How long does mixed 2-stroke fuel last?
Plan on about 30 days for untreated pump gas premix, and longer with a fuel stabiliser or with ethanol-free fuel. Stale mix is the most common cause of a small engine that will not start after sitting.
What is 50:1 in ounces and millilitres?
A 50:1 mix is 2.56 fluid ounces of oil per US gallon of gas, or 20 ml of oil per litre.
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