Two-Stroke Premix Ratio Calculator and Quick Reference Table

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Premix Calculator

To calculate how much oil to add to your gasoline:

  1. Type the number of gallons (or liters) of fuel you are using in the first box.
  2. Adjust the ratio desired in the second box.
  3. Hit your Enter key.

The calculated amount of Two-Cycle Oil to use will be displayed in the final box.

Fuel to premix Ratio Two-Cycle Oil
US Gal:   Ratio: :1 Fluid oz
Liter(s): Ratio: :1 cc(s) or mL(s)

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Premix Quick Reference Table

Ratio = Percent
   17:1 = 6% 
  20:1 = 5% 
  25:1 = 4% 
  32:1 = 3% 
  50:1 = 2%  

 

Gallons of fuel to Ounces of oil
Ratio
Gas:Oil
1      2 3 4        5        6        7        8        9        10     
17:1 7.5 15.1 22.6 30.1 37.6 45.2 52.7 60.2 67.8 75.3
20:1 6.4 12.8 19.2 25.6 32.0 38.4 44.8 51.2 57.6 64.0
25:1 5.1 10.2 15.4 20.5 25.6 30.7 35.8 41.0 46.1 51.2
32:1 4.0 8.0 12.0 16.0 20.0 24.0 28.0 32.0 36.0 40.0
50:1 2.6 5.1 7.7 10.2 12.8 15.4 17.9 20.5 23.0 25.6

Gallons of fuel to Ounces of oil
Ratio
Gas:Oil
11 12 13 14 15 16 17 18 19 20
17:1 82.8 90.4 97.9 105.4 112.9 120.5 128.0 135.5 143.1 150.6
20:1 70.4 76.8 83.2 89.6 96.0 102.4 108.8 115.2 121.6 128.0
25:1 56.3 61.4 66.6 71.7 76.8 81.9 87.0 92.2 97.3 102.4
32:1 44.0 48.0 52.0 56.0 60.0 64.0 68.0 72.0 76.0 80.0
50:1 28.2 30.7 33.3 35.8 38.4 41.0 43.5 46.1 48.6 51.2

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