Enter your Fuel Amount, choose your Unit System, and set your Gas to Oil Mix Ratio — the Two-Stroke Fuel Mix Calculator tells you exactly how much Oil Amount to add, plus your final Mix Ratio and Oil Percentage so your engine gets the right blend every time.
Oil Amount Needed
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Fuel Amount
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Mix Ratio
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Oil Percentage
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The most common ratio for modern 2-stroke engines is 50:1, which means 50 parts gasoline to 1 part oil. This equates to 2.6 fluid ounces of oil per gallon of gas.
For a 50:1 mix ratio with 5 gallons of gas, you need 12.8 fluid ounces (0.4 quarts) of 2-stroke oil. Always check your equipment manual for the correct ratio.
Too much oil can cause excessive smoke, carbon buildup, and poor performance. Too little oil can cause engine seizure and permanent damage. Always follow manufacturer specifications.
No, never use regular automotive oil in 2-stroke engines. Use only high-quality 2-stroke oil specifically designed for air-cooled or water-cooled engines as appropriate.
Equipment manufactured before 2003 typically requires a 32:1 ratio, while very old equipment may need 25:1 or even richer ratios. Check your owner's manual or equipment label.
Add the correct amount of 2-stroke oil to a clean gas can first, then add the gasoline. Cap and shake or stir the container to ensure proper mixing before fueling your equipment.
Yes, but use fuel stabilizer and store in a cool, dry place. Most pre-mixed fuel should be used within 30-60 days for best performance. Synthetic oils may allow longer storage.
Air-cooled oils are designed for higher operating temperatures in equipment like chainsaws and trimmers. Water-cooled oils are formulated for outboard motors that run cooler due to water cooling.