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Specified Petrol-to-Oil Volume Calculator

Calculate the oil amount for a supplied petrol-to-oil ratio.

  • Formula & worked example
  • Private in your browser
  • No signup
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Calculator inputs

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Edit a calculated value to solve backwards, or lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

Private by default

Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.

Formula and method

At a petrol-to-oil ratio of 50:1, five litres of petrol require 0.1 litre, or 100 mL, of oil.

Oil volume = petrol volume ÷ petrol-to-oil ratio

Worked example

Enter these known values and leave the other values blank.

Gas-to-oil ratio
50 :1
Gas (petrol) volume
5 L
Oil volume
0.1 L

Assumptions and limitations

  • No. Enter the ratio and oil specification required by the equipment manufacturer. The ratio compares petrol volume with oil volume; it is not oil as a percentage of the combined mixture. This tool does not determine fuel compatibility.
  • Match the units shown and use measured inputs where available. The result follows the stated model and does not account for unentered changes.

Common questions

Does the calculator choose the correct engine mixture?

No. Enter the ratio and oil specification required by the equipment manufacturer. The ratio compares petrol volume with oil volume; it is not oil as a percentage of the combined mixture. This tool does not determine fuel compatibility.

References

The calculation equations, inverse formulas, units, and input rules were imported from this source. Bookify provides the interface and equation solver.

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