basic

Two-Stroke Engine Fuel-Mix Calculator

oz_oil_per_gal = 128 / mix_ratio.

Compute the ounces of two-stroke oil to add per US gallon of gasoline for a chosen fuel-to-oil mix ratio (e.g. 50:1, 40:1, 32:1): oz_oil_per_gal = 128 / mix_ratio. Also reports total oil for any number of gallons.

Marcus Laurent By Marcus Laurent
Published Last reviewed 1 min read

Inputs

gal

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

oz_oil_per_gal = 128 / ratio

In depth

Compute the ounces of two-stroke oil to add per US gallon of gasoline for a chosen fuel-to-oil mix ratio (e.g. 50:1, 40:1, 32:1): oz_oil_per_gal = 128 / mix_ratio. Also reports total oil for any number of gallons.