2-Cycle Oil Mix Calculator is a free web tool for anyone who fuels a two-stroke engine. Instead of hunting through forum threads for a single number in the wrong units, you enter your gas in US gallons or litres and a ratio (100:1, 50:1, 40:1, 32:1, 25:1, 20:1 or custom) and get the exact oil in ounces and millilitres.

An Oil to Fuel mode reverses the calculation, results can be shared with a link, and the tool remembers your last inputs on your device. Around the calculator sit equipment pages for chainsaws, string trimmers, leaf blowers, lawn mowers, dirt bikes and outboard motors, printable mix charts in US and metric units, an FAQ and mixing guides.

No accounts, no paywall, no app to install; English and Spanish.