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2-Stroke Fuel Mix Calculator

Find the oil to add to a measured gasoline amount, or the gasoline to mix with a measured oil portion. Enter the ratio required by your equipment and oil instructions. All ratios here name gasoline first and oil second.

New premix batch

Enter gasoline only, not the finished mixture. Changing the input unit reinterprets the number.

For 50 parts gasoline to 1 part oil, enter 50. This form names gasoline first; do not enter 1:50 or 50:1.

Oil to add

Enter a volume and ratio to see the result.

Use the ratio and suitable oil specified in the instructions for your equipment and oil.

Calculation details

Oil volume = gasoline volume ÷ gasoline parts per one oil part, after converting units.

  • Results are shown to up to four significant digits. Measure using suitable marked equipment; display digits do not guarantee measurement accuracy.

  • Use the ratio and suitable oil specified in the instructions for your equipment and oil.

Convert other volumes with Unit Converter

How to calculate a two-stroke mix

  1. Choose oil needed or gasoline from oil. Enter the measured component and its unit.
  2. Enter the number of gasoline parts per one oil part, using the ratio specified in your instructions.
  3. Choose a result unit and read the approximate result. Measure with suitable marked equipment.

Understanding gasoline-to-oil ratios

A 50:1 gasoline:oil ratio means 50 equal volumes of gasoline for each volume of oil. This calculator always names gasoline first.

Some instructions write oil first, such as 1:50. If that means one part oil to 50 parts gasoline, enter 50; the form already shows :1.

For known gasoline, divide its volume by the ratio. For known oil, multiply its volume by the ratio. Convert units consistently.

US and Imperial gallons and fluid ounces differ. Fluid ounces here measure volume, not mass.

Examples

At 50:1, 5 litres of gasoline require about 100 millilitres of oil.

At 32:1, 5 litres of gasoline require about 156.3 millilitres of oil after display rounding.

At 50:1, 100 millilitres of oil correspond to about 5 litres of gasoline.

What this calculator does not solve

Enter gasoline before adding oil, or a measured oil portion for a new batch. A finished mixture or the capacity of a container is not a valid input.

The calculator does not choose a ratio or oil, correct existing premix, or assess equipment compatibility. Follow the relevant instructions.

Your entries

The arithmetic runs in your browser. This tool adds no input upload, saved record or input-bearing URL. Existing website consent, analytics and network services remain separate.

Two-stroke mix questions

No. Enter the volume ratio required by the instructions for your equipment, oil and application. Examples do not establish a universal ratio.

First identify the component order. If that means one oil part for 50 gasoline parts, enter 50: this form names gasoline first and already shows :1.

An Imperial gallon is about 4.54609 litres; a US liquid gallon is about 3.78541 litres. More gasoline at the same ratio requires more oil. Their fluid ounces also differ.

No. Enter gasoline before adding oil, or a measured oil portion for a new batch. Neither mode determines the contents of an existing mixture or how much fits in a container.

Sources

References for ratio interpretation and volume conversions:

Checked on October 29, 2026.

These sources do not endorse this tool. Follow the instructions for your equipment and oil.

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