2 Stroke Oil Mixing Calculator
Calculate the exact amount of 2-stroke oil needed for your fuel mix.
Units of Measurement
Please enter a valid number.
Please enter a valid number.
: 1
Result
-How the 2 Stroke Oil Mixing Calculator Works
Enter your total fuel volume in gallons or liters, then choose your desired gas-to-oil mix ratio (such as 25:1, 40:1, or 50:1). The calculator divides the fuel amount by the ratio to show how much 2-stroke oil you need. This helps protect your engine from running too lean (not enough oil) or too rich (too much oil), ensuring smoother performance and longer engine life.
Common 2-Stroke Mix Ratios Table
| Fuel | Ratio | Oil Required |
|---|---|---|
| 1 gal (3.79 L) | 25:1 | 5.1 oz (150 ml) |
| 1 gal (3.79 L) | 32:1 | 4.0 oz (120 ml) |
| 1 gal (3.79 L) | 40:1 | 3.2 oz (95 ml) |
| 1 gal (3.79 L) | 50:1 | 2.6 oz (75 ml) |
| 2 gal (7.57 L) | 25:1 | 10.2 oz (300 ml) |
| 2 gal (7.57 L) | 32:1 | 8.0 oz (240 ml) |
| 2 gal (7.57 L) | 40:1 | 6.4 oz (190 ml) |
| 2 gal (7.57 L) | 50:1 | 5.1 oz (150 ml) |
| 2.5 gal (9.46 L) | 25:1 | 12.8 oz (380 ml) |
| 2.5 gal (9.46 L) | 32:1 | 10.0 oz (300 ml) |
| 2.5 gal (9.46 L) | 40:1 | 8.0 oz (240 ml) |
| 2.5 gal (9.46 L) | 50:1 | 6.4 oz (190 ml) |
| 5 gal (18.93 L) | 25:1 | 25.6 oz (760 ml) |
| 5 gal (18.93 L) | 32:1 | 20.0 oz (600 ml) |
| 5 gal (18.93 L) | 40:1 | 16.0 oz (475 ml) |
| 5 gal (18.93 L) | 50:1 | 12.8 oz (380 ml) |
Frequently Asked Questions
How long does 2 stroke fuel last?
Ideally use 2-stroke fuel within 30 days. In a sealed container it may be okay for up to about 2–3 months (longer with stabilizer), but if it smells bad or looks off, mix a fresh batch.
50 to 1 ratio in litres?
At 50:1 you add 20 ml of 2-stroke oil per 1 liter of fuel. Examples: 2 L = 40 ml, 5 L = 100 ml.
How many ounces of 2 stroke oil for 5 gallons?
For 5 gallons: at 50:1 use 12.8 fl oz, at 40:1 use 16 fl oz, at 32:1 use 20 fl oz of oil.
How much 2 stroke oil per gallon?
For 1 US gallon: 50:1 = 2.6 fl oz, 40:1 = 3.2 fl oz, 32:1 = 4.0 fl oz, 25:1 = 5.1 fl oz.
How many ounces of oil for 50 to 1 mix ratio?
At 50:1 use about 2.6 fl oz per gallon (5.1 fl oz for 2 gal, 6.4 fl oz for 2.5 gal, 12.8 fl oz for 5 gal).