Two-Stroke Oil Calculator

Determine the perfect oil volume for your fuel tank.

Enter the total amount of gasoline you need to mix

Check your equipment manual for the recommended ratio

Required Oil Volume

Metric Volume (Milliliters) 100.0 mL
Imperial Volume (Fluid Ounces) 3.4 fl oz

Frequently Asked Questions About Two-Stroke Oil Mixing

What is a 50:1 fuel mix ratio?

A 50:1 ratio means 50 parts gasoline to 1 part oil. For example, for every 50 gallons of gas, you would add 1 gallon of oil. This is the most common ratio for modern two-stroke engines.

How do I mix 2-stroke fuel for a chainsaw?

First, check your chainsaw manual for the recommended ratio. Use our calculator to determine the correct amount of oil for your gasoline volume. Always add oil to a small amount of gas first, mix thoroughly, then add the remaining gas and mix again.

What happens if I use too much oil in my 2-stroke mixture?

Too much oil (a “rich” mixture) can cause excessive smoke, spark plug fouling, carbon buildup, and reduced engine performance. In severe cases, it can lead to engine damage.

What happens if I use too little oil in my 2-stroke mixture?

Too little oil (a “lean” mixture) is much more dangerous. It can cause engine overheating, piston seizure, and catastrophic engine failure due to insufficient lubrication.

Can I use the same 2-stroke oil for all my equipment?

While many 2-stroke oils are formulated for multiple applications, it’s best to use oil specifically recommended for your equipment. Marine engines, for example, often require different additives than lawn equipment.