Two-Stroke Fuel Mix Table: Oil to add by Petrol quantity
Reference table of oil to add for Two-Stroke Fuel Mix across a range of petrol quantity values — exact, engine-computed figures you can read off at a glance.
Two-Stroke Fuel Mix Calculator
Verified formula Updated Jun 2026 Private — runs on your device
Verified formula
Private
Oil to add
100.0
For general information only — not financial, tax, legal or medical advice. Verify before you rely on it.
How to use the Two-Stroke Fuel Mix Calculator
The Two-Stroke Fuel Mix Calculator works out your oil to add in an instant. Enter petrol quantity and mix ratio (fuel : oil) and the result updates as you type — it is free, needs no sign-up, and runs entirely in your browser so your figures stay private.
- Enter the petrol quantity.
- Enter the mix ratio (fuel : oil).
- Read off your oil to add — the calculator updates automatically, with no button to press.
Formula
The Two-Stroke Fuel Mix Calculator uses the formula:
Oil to add = Petrol quantity × 1000 ÷ Mix ratio (Petrol quantity : oil)
Worked example
For example, with petrol quantity of 5 litres and mix ratio (fuel : oil) of 50, the oil to add is 100.0.
| Petrol quantity | 5 litres |
|---|---|
| Mix ratio (fuel : oil) | 50 |
| Oil to add | 100.0 |
|---|
Results are estimates for educational use, not professional advice.
Key terms explained
- Ratio
- A comparison of two quantities showing how many times one contains the other.
Frequently asked questions
Divide the petrol in millilitres by the ratio. 5 litres at 50:1 needs 100 ml of two-stroke oil.
It means 50 parts petrol to 1 part oil by volume. A lower number, like 25:1, means more oil.
Too little oil can seize the engine; too much causes smoke and fouling. Always follow the manufacturer's ratio.
Use oil designed for air-cooled two-stroke engines, matched to your equipment's specification.
The Two-Stroke Fuel Mix Calculator uses the formula: Oil to add = Petrol quantity × 1000 ÷ Mix ratio (Petrol quantity : oil). For example, with petrol quantity of 5 litres and mix ratio (fuel : oil) of 50, the oil to add is 100.0.
Enter the petrol quantity. Enter the mix ratio (fuel : oil). Read off your oil to add — the calculator updates automatically, with no button to press.
Related guides
How to Calculate Two-Stroke Fuel Mix: Formula, Steps & Examples
Learn how to calculate Two-Stroke Fuel Mix — the formula explained step by step, with worked examples and a free calculator to check your answer.