50:1 fuel mix: how much oil per gallon?
For a 50:1 mix, add 2.6 fl oz (76 ml) of 2-stroke oil to each US gallon of gas, or 20 ml per liter. That is 2 % oil.
A 2.6 fl oz bottle of oil goes with 1.02 gal (3.84 L) of gas at 50:1.
50:1 oil per US gallons of gas
50:1 oil per US gallons of gas| Gas | Oil | In spoons |
|---|
| 1 gal | 2.6 fl oz (76 ml) | 5.1 tbsp · 15.4 tsp |
|---|
| 2 gal | 5.1 fl oz (151 ml) | 10.2 tbsp · 30.7 tsp |
|---|
| 2.5 gal | 6.4 fl oz (189 ml) | 12.8 tbsp · 38.4 tsp |
|---|
| 3 gal | 7.7 fl oz (227 ml) | 15.4 tbsp · 46.1 tsp |
|---|
| 5 gal | 12.8 fl oz (379 ml) | 25.6 tbsp · 76.8 tsp |
|---|
50:1 oil per liters of gas
50:1 oil per liters of gas| Gas | Oil |
|---|
| 1 L | 20 ml (0.7 fl oz) |
|---|
| 4 L | 80 ml (2.7 fl oz) |
|---|
| 5 L | 100 ml (3.4 fl oz) |
|---|
| 10 L | 200 ml (6.8 fl oz) |
|---|
| 20 L | 400 ml (13.5 fl oz) |
|---|
Every common ratio, per gallon and per liter
Every common ratio, per gallon and per liter| Ratio | Oil per gallon | Oil per liter |
|---|
| 50:1 | 2.6 fl oz (76 ml) | 20 ml |
|---|
| 40:1 | 3.2 fl oz (95 ml) | 25 ml |
|---|
| 32:1 | 4 fl oz (118 ml) | 31 ml |
|---|
| 25:1 | 5.1 fl oz (151 ml) | 40 ml |
|---|
| 20:1 | 6.4 fl oz (189 ml) | 50 ml |
|---|
50:1 means 50 parts gas to 1 part oil: oil = gas ÷ 50, gas = oil × 50. 1 US gal = 128 fl oz = 3.785 L; 1 imperial gal = 4.546 L. Spoons are US: 1 tbsp = 1/2 fl oz, 1 tsp = 1/6 fl oz.
Estimates. Follow your engine manual’s ratio and the oil maker’s label. Mix outdoors in an approved fuel can, away from sparks and flames.
Frequently asked questions
How much oil per gallon at 50:1?
For a 50:1 mix, add 2.6 fl oz (76 ml) of 2-stroke oil to each US gallon of gas, or 20 ml per liter. That is 2 % oil.
How much oil for 5 gallons at 50:1?
12.8 fl oz (379 ml): 5 × 128 = 640 fl oz of gas, and 640 ÷ 50 = 12.8.
What percent oil is 50:1?
2 %: 1 part oil to 50 parts gas, and 1 ÷ 50 = 0.02. Use the ratio your engine’s manual gives.