Saw: Chainsaw & Fuel Mix Calc

Mix 2-stroke fuel right, pick the right file for your chain, and buy the right chain first try. OEM, Oregon, OPEI & OSHA cited. Pay once. No subscription.

Pay once. No subscription, no ads, no account. Works offline.

Saw is the chainsaw companion. Mix 2-stroke fuel exactly, know which round file your chain takes before you ruin a cutter, and walk into the store with the three numbers that buy the right replacement chain — every figure cited to its source.

Free forever • Fuel mix calculator — 50:1, 40:1, 32:1, 25:1 or custom, any tank size, in fluid ounces and millilitres (modern Stihl and Husqvarna equipment runs 50:1 — your manual is final) • Fuel rules that save engines — never above 10% ethanol, never fuel older than ~30 days, per OPEI • Chain & file chart — the right round file for 1/4", 3/8" low-profile, .325", 3/8" and .404" pitch, from Oregon file-guide sizing, plus angle and depth-gauge guidance • Cut Safe — OSHA kickback, starting, and PPE rules, cited

Saw Pro — one-time unlock • Chain ID — measure across three rivets and get your pitch; add gauge and drive-link count and you have exactly the chain to buy, first try • Chain tracker — every chain you own: which saw it fits, its exact spec, and its sharpening log. Honest by design: a chain retires at the wear mark on its cutters — the count is a planning proxy, and the app says so.

Works for every 2-stroke you own: chainsaws, trimmers, blowers, outboards, dirt bikes — the mix math is the same.

For firewood cutters, rural homeowners, homesteaders, and storm-cleanup crews.

$6.99 one-time for Saw Pro. No subscription, no ads, no account.

Privacy: Saw collects nothing. No analytics, no accounts, no cloud. Your chains live on your device.