Enter your Fuel Amount, choose your Fuel:Oil Mix Ratio (or plug in a Custom Mix Ratio), and the Two-Stroke Premix Calculator tells you exactly how much Oil Required to hit the right blend — plus your Total Mixture volume and the Mix Ratio Used for a quick sanity check.
Oil Required
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Mix Ratio Used
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Total Mixture
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Premixed fuel is gasoline mixed with two-stroke oil at a specific ratio. Two-stroke engines don't have a separate oil system, so oil must be mixed with fuel to lubricate engine components.
For a 50:1 mix ratio, you need 12.8 ounces of oil for 5 gallons of fuel. For 40:1 ratio, you need 16 ounces of oil for 5 gallons.
Most 2-stroke engines use a 50:1 ratio, which equals 2.6 ounces of oil per gallon of gasoline. Some older engines may require 40:1 ratio (3.2 ounces per gallon).
Proper fuel mixing ensures adequate lubrication of engine components. Too little oil causes engine damage from lack of lubrication, while too much oil can foul spark plugs and reduce performance.
Using too little oil (lean mix) can cause engine seizure and permanent damage. Using too much oil (rich mix) leads to excessive smoke, carbon buildup, and poor performance.
Use only high-quality 2-stroke oils that meet your engine manufacturer's specifications. Different oils may have different mix ratios, so always check the oil bottle and your owner's manual.
Use a measuring cup with fine graduations or a syringe for small amounts. Many 2-stroke oils come with measuring bottles that have ratio markings for convenience.
Always pre-mix fuel in a separate container before adding to your tank. This ensures proper mixing. Add oil first, then fuel, and shake or stir thoroughly before use.