2-Stroke Fuel Mix Charts – Gas to Oil Ratio Guides for Every Engine
Whether you’re running a chainsaw, dirt bike, outboard motor, or string trimmer, using the correct fuel-to-oil ratio is critical to keep your 2-stroke engine running strong and lasting longer. This page serves as your go-to guide for 2-stroke fuel mix ratios, with detailed charts and mixing instructions for the most common premix ratios, including 60:1,50:1, 40:1, 32:1, 25:1, and more.
For detailed instructions on what you need and how to mix a batch are here.
Metric Chart (Litres : Millilitres)
| Oil (ml) | ||||||||
|---|---|---|---|---|---|---|---|---|
| Fuel (L) | 16:1 | 20:1 | 24:1 | 25:1 | 30:1 | 40:1 | 50:1 | 60:1 |
| 1 | 63 | 50 | 42 | 40 | 33 | 25 | 20 | 17 |
| 2 | 125 | 100 | 83 | 80 | 67 | 50 | 40 | 33 |
| 3 | 188 | 150 | 125 | 120 | 100 | 75 | 60 | 50 |
| 4 | 250 | 200 | 167 | 160 | 133 | 100 | 80 | 67 |
| 5 | 313 | 250 | 208 | 200 | 167 | 125 | 100 | 83 |
| 7.5 | 469 | 375 | 313 | 300 | 250 | 188 | 150 | 125 |
| 10 | 625 | 500 | 417 | 400 | 333 | 250 | 200 | 167 |
| 15 | 938 | 750 | 625 | 600 | 500 | 375 | 300 | 250 |
| 20 | 1250 | 1000 | 833 | 800 | 667 | 500 | 400 | 333 |
| 25 | 1563 | 1250 | 1042 | 1000 | 833 | 625 | 500 | 417 |
US Chart (Gallons : Fluid Ounces)
| Oil (fl oz) | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Fuel (gal) | 16:1 | 20:1 | 24:1 | 25:1 | 30:1 | 32:1 | 40:1 | 50:1 | 60:1 |
| 1 | 8 | 6 | 5 | 5 | 4 | 4 | 3 | 3 | 2 |
| 1.5 | 12 | 10 | 8 | 8 | 6 | 6 | 5 | 4 | 3 |
| 2 | 16 | 13 | 11 | 10 | 9 | 8 | 6 | 5 | 4 |
| 2.5 | 20 | 16 | 13 | 13 | 11 | 10 | 8 | 6 | 5 |
| 3 | 24 | 19 | 16 | 15 | 13 | 12 | 10 | 8 | 6 |
| 4 | 32 | 26 | 21 | 20 | 17 | 16 | 13 | 10 | 9 |
| 5 | 40 | 32 | 27 | 26 | 21 | 20 | 16 | 13 | 11 |
| 7.5 | 60 | 48 | 40 | 38 | 32 | 30 | 24 | 19 | 16 |
| 10 | 80 | 64 | 53 | 51 | 43 | 40 | 32 | 26 | 21 |
| 15 | 120 | 96 | 80 | 77 | 64 | 60 | 48 | 38 | 32 |
Ratio Specific Charts
To view or download a printable version of a mixture ratio chart for a specific 2 stroke mix ratio , please select your preferred ratio below:
50:1 Fuel Mix Chart
The most common ratio for modern 2-stroke engines. Recommended for newer chainsaws, trimmers, and small engines. Requires 2.6 oz of oil per gallon of gas.
40:1 Fuel Mix Chart
A slightly richer mix used in older or high-RPM tools. Offers extra lubrication. Requires 3.2 oz of oil per gallon of gas.
32:1 Fuel Mix Chart
Popular for vintage engines or machines under heavy load. Requires 4 oz of oil per gallon of gas.
25:1 Fuel Mix Chart
One of the richest oil blends, commonly used in very old 2-stroke motors. Provides maximum lubrication. Requires 5.1 oz of oil per gallon of gas.
What Is a 2-Stroke Fuel Mix Ratio?
A fuel mix ratio describes the amount of gasoline to 2-stroke oil your engine needs to operate safely. For example, a 50:1 ratio means you mix 50 parts gasoline with 1 part oil. Using the correct ratio is essential to:
- Prevent engine wear or seizure
- Ensure proper combustion
- Extend engine lifespan
- Avoid smoke, carbon deposits, and spark plug fouling
Why These Charts Matter
Our mix charts are easy to read and include:
- U.S. measurements (gallons to ounces)
- Metric conversions (litres to millilitres)
- Mixing instructions for safe and accurate prep
- Helpful FAQs and storage tips
Tools for Mixing 2-Stroke Fuel
To get the perfect mix every time, we recommend:
- Fuel-safe measuring jugs or bottles
- Digital fuel mix calculators
- Quality 2-stroke oils (synthetic or semi-synthetic)
- Properly labeled fuel containers
2 Stroke Mix App
If you’re looking for something to help with other ratios and remind you how old your fuel is, please take a look at our app for iPhone and Apple Watch on the front page?
Need Help Choosing a Ratio?
Not sure which mix your engine needs? Always check:
- Your owner’s manual
- The engine casing or carburetor label
- Manufacturer’s website
If in doubt, never go leaner than recommended. Using too little oil can damage your engine permanently.