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info Overview

Enter gasoline volume and pick 25:1, 40:1, 50:1 or a custom ratio to get exact oil in ml for chainsaws and trimmers.

📘 How to Use

  1. Set the gasoline volume using the slider or number input
  2. Select the mix ratio (25:1, 40:1, 50:1, or enter a custom value)
  3. The required engine oil amount and total fuel volume are displayed instantly

2-Stroke Fuel Mix Calculator

local_gas_station Gasoline Volume

L
0.5L 10L 20L

tune Mix Ratio

:1

water_drop Result

Required Engine Oil

200 ml

Total Mixed Fuel

5.2 L

warning Gasoline is a highly flammable liquid. Always mix fuel outdoors in a well-ventilated area, away from heat and open flames. Refer to your engine manufacturer's manual for the recommended mix ratio and oil type.

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Article

2-Stroke Fuel Mix Calculator | Instantly Calculate Oil-to-Gas Ratios

Two-stroke (2-cycle) engines used in chainsaws, string trimmers, leaf blowers, and small outboard motors require a precise mixture of gasoline and 2-stroke oil. This calculator determines the exact amount of oil you need based on your fuel volume and the manufacturer's specified ratio.

💡 Tool Overview

Unlike four-stroke engines that have a separate oil sump, two-stroke engines rely on oil mixed directly into the fuel for internal lubrication. Getting the ratio right is critical: too little oil causes overheating and engine seizure, while too much leads to carbon buildup, fouled spark plugs, and excessive smoke.

Common mix ratios include:

  • 25:1 — Older engines and some heavy-duty chainsaws
  • 40:1 — Standard for many consumer-grade trimmers and blowers
  • 50:1 — Modern high-performance engines (Husqvarna, Stihl, Echo)

Always check your equipment's owner manual for the correct ratio before mixing.

🧐 FAQ

Can I store premixed fuel?

Premixed fuel degrades over time. Use it within 30 days for best results. A fuel stabilizer can extend shelf life, but mixing only what you need for each session is ideal.

What type of oil should I use?

Use only oil specifically labeled for 2-stroke / 2-cycle engines. Never use automotive motor oil. Look for oils meeting ISO-L-EGD, JASO FC/FD, or API TC standards.

What happens if I use the wrong ratio?

A leaner mix (less oil) risks engine damage from insufficient lubrication. A richer mix (more oil) causes carbon deposits and spark plug fouling but is generally less destructive in the short term.