Gas Oil Mix Ratio Calculator
Required Oil:
*Always refer to your engine manufacturer's manual for specific ratio requirements.
Understanding 2-Stroke Fuel Ratios
Two-stroke (2-cycle) engines, commonly found in chainsaws, weed eaters, leaf blowers, and outboard motors, do not have a dedicated oil reservoir like a car engine. Instead, they require oil to be mixed directly with the gasoline to provide lubrication to the engine's internal moving parts. Getting the ratio correct is vital for the performance and longevity of your equipment.
Common Mix Ratio Examples
The "ratio" refers to the parts of gasoline relative to one part of oil. For example, a 50:1 ratio means 50 parts of gasoline for every 1 part of oil.
| Ratio | Oil for 1 Gallon Gas (fl oz) | Oil for 5 Liters Gas (ml) |
|---|---|---|
| 50:1 | 2.6 oz | 100 ml |
| 40:1 | 3.2 oz | 125 ml |
| 32:1 | 4.0 oz | 156 ml |
| 25:1 | 5.1 oz | 200 ml |
How to Use This Calculator
1. Amount of Gasoline: Enter how much gas you have in your container.
2. Units: Select whether you are measuring in Gallons (US) or Liters.
3. Ratio: Enter the engine manufacturer's suggested ratio. If the manual says 50:1, just enter "50".
4. Result: If using Gallons, the result will show in Fluid Ounces. If using Liters, the result will show in Milliliters.
Important Mixing Tips
- Use Fresh Fuel: Use gasoline with an octane rating of 87 or higher. Avoid fuel with more than 10% ethanol.
- The Right Oil: Only use oil specifically labeled for "2-Cycle" or "2-Stroke" engines. Never use regular motor oil (SAE 30, etc.).
- The Mixing Process: Always pour the oil into the gas can first, then add the gasoline. This helps the oil and gas mix more thoroughly. Shake the container gently before filling your equipment.
- Storage: Mixed fuel begins to degrade after 30 days. Only mix what you plan to use within a month.