Fuel Mix Calculator
Oil Required:
Fuel Mix Calculation Report
Your personalized fuel-oil mixture calculation
Fuel Details
Calculation Results
Mixing Instructions
Note: This calculation is based on standard mixing ratios. Always consult your engine manufacturer’s recommendations for the correct fuel-oil ratio.
If you use chainsaws, dirt bikes, or other small engines that need a gas-and-oil mix, getting the ratio right is important. The Fuel Mix Calculator helps you quickly find the right mix for your 2-stroke engine.
What’s a 50:1 Fuel Mix in Litres?
A 50:1 mix means you use 50 parts of fuel for every 1 part of 2-stroke oil.
Quick Reference Chart:
| 1 L | 20 ml |
| 2 L | 40 ml |
| 5 L | 100 ml |
| 10 L | 200 ml |
This chart tells you how much 2-stroke oil to add so your engine runs smoothly.
How Much 2-Stroke Oil for a Gallon of Gas?
If you measure in gallons, use these amounts of oil:
- 50:1 → 2.6 oz oil per gallon
- 40:1 → 3.2 oz oil per gallon
- 25:1 → 5.1 oz oil per gallon
Always check your mix ratio chart to be sure you get it right.
What About a 25:1 Ratio in Litres?
A 2A 25:1 ratio means you use more oil compared to fuel. For 1 L of fuel, add 40 ml of oil.
- For 5 L, add 200 ml of oil.
This richer mix is often best for breaking in a new engine or caring for an older one.
What will Happen If You Use 50:1 Fuel in a 40:1 Engine?
Using the wrong mix can cause problems.
ll If you use 50:1 fuel in a 40:1 engine, there is not enough oil. This can cause overheating, extra wear, or even damage.
If you make a mistake, you can fix it by adding more oil.
How to Mix 2-Stroke Oil and Gas
- Check your mix ratio, such as 40:1 or 50:1. Pour the 2-stroke oil into your fuel can first, then add the fuel. Mix everything evenly.
- Label the can clearly. For example, write “50:1 gas-oil” to calculate the Fuel-Air ratio. Most engines work best with a fuel-air ratio of about 14.7:1. This means 14.7 parts air for every 1 part fuel.t Lower, or richer, ratios burn cooler.cooler.
- Higher, or leaner, ratios burn hotter.
How to Calculate an Octane Mix
To mix fuels with different octane ratings, use this simple formula:
Final Octane = (O₁ × V₁ + O₂ × V₂) ÷ (V₁ + V₂)
Example:
To make 91-octane fuel from 93 and 87, mix 3.3 gallons of 93-octane with 1.7 gallons of 87-octane. How Much Oil for Five Gallons of Pump Gas?
- 50:1 → 12.8 oz oil
- 40:1 → 16 oz oil
- 32:1 → 20 oz oil
Always double-check your oil mix ratio before adding it.
If I Can’t Find 25:1 2-Stroke Oil, Can I Just Double the Amount?
Yes, you can use any 2-stroke oil for a 25:1 mix by doubling the amount you would use for a 50:1 mix.
The most important thing is the mix ratio, not the label on the oil.
Fuel-to-Oil Ratio for Baja 5SC
Most Baja 5SC owners use a 25:1 or 32:1 oil mix with good-quality synthetic 2-stroke oil.
Always check your owner’s manual first. Octane & Ethanol Mix Tips
To mix E85 and regular gasoline, use this simple formula: to make E30 fuel (30% ethanol) with a total of 12 gallons, mix 3.2 gallons of E85 with 8.8 gallons of regular gasoline.
Quick Reference Chart
| 25:1 | 40 | 5.1 | Old 2-stroke engines |
| 32:1 | 32 | 4.0 | Dirt bikes |
| 40:1 | 25 | 3.2 | Chainsaws, trimmers |
| 50:1 | 20 | 2.6 | Modern 2-strokes |
Too little oil can cause engine wear or even damage. Using the right mix is very important.
- Too little oil can cause engine wear or damage.
- Too much oil can cause smoke and foul spark plugs. Always use the mix ratio recommended for your engine.
Final Thoughts
The Fuel Mix Calculator makes mixing oil simple.
Just enter how much fuel you need and your preferred mix ratio, and it will tell you the right amount of oil for your 2-stroke engine.
It’s never been easier to get the right oil ratio.
