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info Overview

Enter gasoline volume in US gal or L and pick 25:1, 40:1, 50:1 or a custom whole-number ratio to get the oil in fl oz or ml for chainsaws and trimmers.

📘 How to Use

  1. Choose US gal / fl oz or L / ml with the unit switch, then set the gasoline volume with the slider or the number field
  2. Select the Mix Ratio (25:1, 40:1, 50:1, or a custom whole number from 1 to 100)
  3. Read the Required Engine Oil and the Total Mixed Fuel in the result card

2-Stroke Fuel Mix Calculator

Unit system

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 | 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.

The unit switch at the top (English version only) starts with US gallons and fluid ounces, and a second choice shows litres and millilitres. For example, 1 US gallon at 50:1 needs 2.56 fl oz of oil, which maker charts round to 2.6 fl oz. The gasoline volume can be 0.1 to 100 L (0.01 to 30 gal), and a custom ratio is a whole number from 1 to 100.

🧐 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.