Chainsaw Bar Length Calculator: What Size Chainsaw Do I Need

For typical firewood rounds of 8 to 16 inches, an 18 inch bar is the most common homeowner choice, with a 40 to 50 cc gas engine or a 56V to 80V battery saw. If you regularly cut larger hardwood logs up to 18 inches, step up to a 20 inch bar on a 50 to 60 cc saw. Match the bar to the wood you cut most, not the biggest log you might see.

Experienced users can cut wood up to about twice the bar length by cutting from both sides, but it is slower and increases the chance of pinching and kickback. For felling, leaning or storm-damaged trees near that size, the risks rise sharply. If the wood is much larger than your bar, use a longer saw or hire a certified arborist rather than pushing a small saw past its range.

A 16 inch saw is lighter and easier to handle for limbing, pruning and storm cleanup on wood up to about 14 inches. An 18 inch saw cuts firewood rounds up to about 16 inches in one pass and is the more versatile homeowner size if you burn wood. Beginners who mostly do yard cleanup are often better served by the 16 inch.

Yes. A longer bar carries more chain in the cut, which needs more power to keep chain speed and cutting efficiency up. As a guide, 12 to 14 inch bars pair with 30 to 40 cc engines or smaller battery systems, 16 to 18 inch bars with 40 to 50 cc or higher-voltage battery saws, and 20 inch bars with 50 to 60 cc engines. Always use bar lengths the saw maker lists as compatible.

A 14 to 16 inch battery chainsaw is usually the best start: no fuel mixing or pull starting, lighter weight and instant stopping when you release the trigger. It handles most yard cleanup and small firewood. Take a basic chainsaw safety course, wear chaps, a helmet with face screen and eye and ear protection, and learn kickback avoidance before cutting anything under tension.