A storm dropped an oak and the log calculator says there's 100+ board feet in it. An Alaskan-style chainsaw mill is the cheapest ticket from that log to slabs — here's what the catalog pages don't spell out.
A chainsaw mill is a rail jig that clamps to your saw's bar and rides a guide across the log, holding the cut at a fixed depth. First pass runs on a ladder or rail screwed to the log; every later pass rides the flat you just made. That's the whole machine — $150–300 of aluminum for the classic Granberg-pattern mills — which is why the real cost question is the saw, not the mill.
Chainsaw kerf eats ⅜″ per pass and simple slabbing skips the side-board recovery that band mills chase, so real-world yield lands near the Doyle figure rather than International ¼″. That 16″ × 12′ log scaling 108 bf Doyle? Expect about that in 8/4 slabs, less if you chase one thick centerpiece. Sticker the slabs the same day, paint the ends, and check them with a moisture meter over the following year — air-drying runs roughly one year per inch of thickness.
Past a few logs a year, the arithmetic flips: portable band mills cut faster, waste half the kerf, and don't ask your spine to feed them. Hiring a mobile sawyer typically runs $80–120/hour or ~$0.35–0.50/bf — if the tally on your log pile clears a thousand board feet, get quotes before buying a bigger saw. The chainsaw mill still earns its shelf space for the one huge yard tree, the remote drop, and the "I want to say I milled it myself" itch, which is, honestly, most of us.
Affiliate note: any future retail links get disclosed here. Guidance compiled from manufacturer specs (Granberg-pattern mills) and long-running milling-community consensus; yield framing per Doyle vs International ¼″ rule behavior.
Plan the session like a scaler, not a hero. Scale the log first with the three-rule calculator so you know what "success" is; Purdue's FNR-191 is the reference if you want the scaling craft behind it. Buck to a length you can actually handle (8–10′ beats 16′ for a first mill), screw the guide rail dead straight, and take a shallow first cut — the slab reveals the log's tension before you've committed the good wood. Seal end grain the same day, sticker on level bearers with weight on top, and label each slab with species and date; a year per inch of air-drying later, the weight calculator will tell you how much water left the pile. The difference between "I milled a log" and "I made lumber" is mostly what happens after the saw stops.