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Two-stroke fuel mix calculator
Work out oil and petrol quantities for a ratio you supply.
A clear answer. Here’s how.
A supplied N:1 petrol-to-oil ratio means N petrol parts for each oil part. If starting with petrol P, oil=P/N; if targeting final volume V, oil=V/(N+1) and petrol=V×N/(N+1). Volumes are assumed additive. Enter the ratio required by the equipment and oil instructions; the example is not a recommendation.
See a worked example
Worked example
A fixed demonstration, separate from the values you enter above.
- Quantity (litres)
- 5
- Petrol-to-oil ratio: petrol parts per 1 oil part
- 50
- Quantity describes
- Petrol before adding oil
Example result
- Petrol volume (litres)
- 5
- Oil volume (millilitres)
- 100
- Oil volume (US fluid ounces)
- 3.38140227018
- Final mixed volume (litres)
- 5.1
Uses your supplied petrol:oil ratio. The example does not select the correct ratio for any equipment.