⛽ 2-STROKE OIL MIX CALCULATOR
2 Stroke Oil Mix
Calculator
Calculate exact oil amounts for any fuel-to-oil ratio. Chainsaws, dirt bikes, outboard motors, and all 2-stroke engines.
⛽ 2-Stroke Mix Calculator
16:1
Older 2-strokes
25:1
Older chainsaws
32:1
Many outboards
40:1
Dirt bikes, ATVs
50:1
Modern chainsaws
Custom
Enter below
Fuel:Oil (e.g. 50 for 50:1)
–Oil (mL)
–Oil (fl oz)
–Oil (tsp)
–Mix Ratio
Common 2-Stroke Ratios
Every 2-stroke engine has a manufacturer-specified fuel-to-oil ratio that must be followed precisely. Too little oil causes engine seizure from inadequate lubrication. Too much oil causes carbon buildup, spark plug fouling, and excessive smoke. Always follow your equipment manual.
| Ratio | Oil per US Gallon | Oil per Litre | Common Equipment |
|---|---|---|---|
| 16:1 | 8.0 fl oz | 62.5 mL | Vintage 2-strokes, some outboards |
| 25:1 | 5.1 fl oz | 40.0 mL | Older chainsaws, leaf blowers |
| 32:1 | 4.0 fl oz | 31.3 mL | Many outboard motors |
| 40:1 | 3.2 fl oz | 25.0 mL | Dirt bikes, ATVs, some chainsaws |
| 50:1 | 2.6 fl oz | 20.0 mL | Modern chainsaws, trimmers, blowers |
⚠️ Always use the ratio specified in your engine’s owner manual. Pre-mixed fuel is available from brands like Stihl MotoMix and TruFuel for convenience and longer shelf life.
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FAQ
Too lean (not enough oil): The engine overheats and seizes — this is the most dangerous mistake and can permanently destroy the engine within minutes of operation. Too rich (too much oil): Engine produces excessive blue smoke, fouls spark plugs, causes carbon buildup on piston/cylinder, and reduces performance. Always err slightly rich if uncertain.
Use a high-quality 2-stroke oil meeting your engine’s specifications. For air-cooled engines (chainsaws, trimmers), use ISO-L-EGD certified oil. For water-cooled outboard motors, use NMMA TC-W3 certified oil. Never use automotive motor oil in a 2-stroke engine — it lacks proper additives and will cause significant engine damage.
Standard pump gasoline mixed with 2-stroke oil has a shelf life of 30–60 days before ethanol-related degradation begins to cause problems. Pre-mixed fuel products like Stihl MotoMix and TruFuel use higher-quality alkylate fuel and last up to 2 years in a sealed container and several months in equipment.