Our handy oil to gas ratio calculator is a vital tool for owners of two-stroke engines, helping them determine the correct mixture of oil and gasoline.
For example, a chainsaw owner might need to mix oil and gas at a 50:1 ratio. The calculator help determine that for 1 gallon of gas, 2.6 ounces of oil are needed.
Oil to Gas Ratio Calculator
| Gas Amount (Gallons) | Ratio | Oil Amount (Ounces) |
|---|---|---|
| 1 | 25:1 | 5.33 |
| 1 | 40:1 | 3.2 |
| 1 | 50:1 | 2.6 |
| 1 | 32:1 | 4 |
| 1 | 16:1 | 8 |
| 2 | 25:1 | 10.67 |
| 2 | 40:1 | 6.56 |
| 2 | 50:1 | 5.2 |
| 2 | 32:1 | 8 |
| 2 | 16:1 | 16 |
| 3 | 25:1 | 16.00 |
| 3 | 40:1 | 9.85 |
| 3 | 50:1 | 7.8 |
| 3 | 32:1 | 12.00 |
| 3 | 16:1 | 24 |
| 4 | 25:1 | 21.33 |
| 4 | 40:1 | 13.41 |
| 4 | 50:1 | 10.4 |
| 4 | 32:1 | 16.00 |
| 4 | 16:1 | 32 |
| 5 | 25:1 | 26.67 |
| 5 | 40:1 | 16.00 |
| 5 | 50:1 | 13.0 |
| 5 | 32:1 | 20.00 |
| 5 | 16:1 | 40.00 |
Oil to Gas Ratio Formula
The formula for calculating the oil to gas ratio is:
Oil Amount = (Gas Amount * Ratio Factor) / (Ratio - 1)Where:
- Oil Amount is in ounces
- Gas Amount is in gallons
- Ratio is the desired oil-to-gas ratio (e.g., 50 for a 50:1 ratio)
Let’s break this down with an example:
For a 40:1 ratio with 2 gallons of gas:
Oil Amount = (2 * 128) / (40 - 1) = 6.56 ouncesHere, 128 is used because there are 128 ounces in a gallon.
Oil to Gas Mix Ratio Chart
| Ratio | Ounces of Oil per Gallon of Gas | Milliliters of Oil per Liter of Gas |
|---|---|---|
| 16:1 | 8 | 500 |
| 20:1 | 6.4 | 320 |
| 24:1 | 5.33 | 250 |
| 32:1 | 4 | 200 |
| 40:1 | 3.2 | 160 |
| 50:1 | 2.6 | 100 |
| 60:1 | 2.1 | 83.3 |
| 80:1 | 1.6 | 62.5 |
| 100:1 | 1.28 | 50 |
How many ounces of 2-stroke oil to 1 gallon of gas?
Let’s use a common 50:1 ratio as an example:
Using the formula:
Oil Amount = (1 * 128) / (50 - 1) = 2.6 ouncesFor a 50:1 ratio, you need 2.6 ounces of 2-stroke oil per gallon of gas.
What is a 50 to 1 oil to gas ratio?
A 50:1 oil to gas ratio means that for every 50 parts of gasoline, there is 1 part of oil. This is a common ratio for many modern two-stroke engines.
For 5 gallons of gas at a 50:1 ratio:
Oil Amount = (5 * 128) / (50 - 1) = 13 ouncesYou would mix 13 ounces of oil with 5 gallons of gas for a 50:1 ratio.
How do you calculate the ratio of oil to gas?
To calculate the ratio of oil to gas, follow these steps:
- Determine the desired ratio (e.g., 40:1)
- Measure the amount of gas in gallons
- Use the formula: Oil Amount = (Gas Amount * 128) / (Ratio – 1)
- Convert the result to a convenient unit (usually ounces)
For 3 gallons of gas at a 40:1 ratio:
Oil Amount = (3 * 128) / (40 - 1) = 9.85 ouncesRound to the nearest convenient measure, in this case, 10 ounces.
How much oil to mix with 5 gallons of gas?
The amount of oil to mix with 5 gallons of gas depends on the required ratio. Let’s calculate for a few common ratios:
- For a 32:1 ratio: Oil Amount = (5 * 128) / (32 – 1) = 20 ounces
- For a 40:1 ratio: Oil Amount = (5 * 128) / (40 – 1) = 16 ounces
- For a 50:1 ratio: Oil Amount = (5 * 128) / (50 – 1) = 13 ounces
Sources / References
- U.S. Forest Service – Two-Cycle Engine Oil Mixing
- Engineering ToolBox – Fuel Oil and Gasoline Mixing Ratios
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