Premix Calculator

2-Stroke gas / oil mix ratio calculator

Calculate fuel mixtures 50:1, 40:1 and more

Units of measurement
Gas / oil mix ratio

Result

100 milliliters

of oil for 5 liters of gas at 50:1

2T oil in stock

Your result is the oil amount for your fuel. Pick a 2-stroke oil for your engine, and check the mix ratio in your engine manual.

Check the mix ratio in your engine manual before you add oil.

See all 2T oils
How to mix it right
  • Always pour the oil into the empty (or near-empty) jerry can first, then add the fuel — it mixes far better than the other way around.
  • Cap the can and shake it for 20–30 seconds. The fuel should look slightly tinted but clear, with no streaks of oil.
  • Use the ratio your engine manual specifies, or the ratio printed on the oil label.

How the 2-stroke premix calculator works

A 2-stroke premix calculator does one job: it tells you exactly how much pre-mix oil to add to a given amount of fuel so the gas-to-oil ratio in your tank matches what your engine needs. Enter the fuel volume in litres or US gallons, pick a ratio (50:1, 40:1, 32:1, 60:1 or a custom value), and the calculator returns the oil amount in millilitres or fluid ounces. The result is the fuel volume divided by the ratio you pick.

How to mix 2-stroke fuel correctly

  1. Use the ratio your engine manual specifies, or the ratio printed on the oil label.
  2. Use the calculator above to convert your fuel can size into the exact oil amount. A 5 L can at 50:1 needs 100 ml of oil; the same can at 32:1 needs roughly 156 ml.
  3. Pour the oil into the empty (or near-empty) jerry can first, then add the fuel on top.
  4. Cap the can and shake for 20–30 seconds.

Common 2-stroke mix ratios — what each one means

  • 50:1 — 20 ml of oil per 1 L of fuel.
  • 60:1 — ≈17 ml per 1 L.
  • 40:1 — 25 ml per 1 L.
  • 32:1 — ≈31 ml per 1 L.

Premix vs. oil injection (TPI / autolube)

Fuel-injected 2-strokes take oil from a separate reservoir, so the fuel tank holds neat petrol. This calculator is for premix mixing.

Frequently asked questions

What is the right 2-stroke oil ratio for my bike?

Use the ratio in your engine manual, or the ratio printed on the oil label. The calculator converts any ratio you enter.

How much 2-stroke oil per litre of fuel at 50:1?

At 50:1 you add 20 ml of oil for every 1 L of fuel. A 5 L can needs 100 ml. A 10 L can needs 200 ml. A 20 L jerry can needs 400 ml. The calculator at the top of the page gives the exact number for any can size.

How much oil per US gallon at 40:1?

At 40:1 you add 3.2 fl oz of oil for every 1 US gallon of fuel. A 2 gal can needs 6.4 fl oz; a 5 gal jerry can needs 16 fl oz. Toggle the calculator above to US units to convert any volume.

Can I use a richer or leaner ratio than the manual says?

The ratio is set by your engine manual or the oil label. The calculator converts any ratio you enter into an oil amount.

Do I need premix on a fuel-injected 2-stroke?

No. Fuel-injected 2-strokes take oil from a separate reservoir, so the fuel tank gets neat petrol. This calculator is for premix mixing.