Bandsaw Blade Length Calculator
Lost the manual? Two wheel measurements and a center distance give you the blade length your saw takes.
Checks: Not independently benchmarked. Method: textbook belt-length formula (exact for equal wheels), shown below. · Last reviewed October 20, 2026
93.48″ blade length · 237.4 cm
Formula: 2 × 24.75 + π × (14 + 14) ÷ 2. Measure the center distance with the tension adjuster at its mid position so the tensioner can take up the difference from a stock blade size.
Order the nearest stock blade length; how much length difference the tensioner can take up depends on the saw. Your saw’s manual trumps the math if they disagree.
The formula
A blade wraps half of each wheel plus the two straight runs between them:
Length = 2 × C + π × (D₁ + D₂) ÷ 2
where C is the distance between wheel centers and D₁, D₂ are the wheel diameters. When both wheels match it collapses to 2C + πD, which is exact. When they differ the straight runs tilt slightly and the true length is longer by about (D₁ − D₂)² ÷ 4C — 0.04″ for 14″ and 12″ wheels at 24.75″ centers — so treat that case as a very close estimate.
A check against a real saw: Grizzly lists a 93½″ blade for its G0555LX, a 14″ bandsaw. If the wheels are 14″ across, 2C + 14π = 93.5 puts the centers about 24.75″ apart, which is what the calculator loads with (93.48″). Those wheel and center figures are backed out of the 93½″ length, not taken from a spec sheet. Grizzly’s T25555 riser kit doubles that saw’s cutting height, from 6″ to 12″, and changes the blade to 105″; adding about 6″ to C in the same formula gives 105.5″, within half an inch of that.
Measure once, buy for years
Do the measurement with the tensioner at mid-travel, write the resulting length on the saw with a paint pen, and every future blade order becomes a thirty-second job. Blade length is fixed by the saw; width, tooth pitch, and steel are where the real choices live. Narrow blades (1/8″–1/4″) track tight curves; wide blades resaw thick stock straight — and resawn lumber is tallied like any other with the board foot calculator.
Frequently asked questions
How do I measure the wheel center distance?
Set the tension/tracking adjuster to the middle of its travel, then measure from the center of the upper wheel axle to the center of the lower one. Measure each wheel across its tire, where the blade rides. Measuring at mid-travel leaves the tensioner room to tighten a slightly short blade or ease off a slightly long one.
My calculated length isn’t a size anyone sells. What do I order?
Order the nearest stock length. The tension adjuster can take up a small difference, but how much varies by saw, so stay close to the factory length and check your manual. Some blade suppliers will also weld a blade to a custom length, so it is worth asking.
Does blade width change the length I need?
No — length is set by the wheel geometry alone. Width changes what the blade can do: narrow blades (1/8″–1/4″) track tight curves, wide blades (1/2″+) resaw straighter. Buy several widths in your saw’s one length.
What if my saw has three wheels?
The two-wheel formula doesn’t apply. For three-wheel saws, check the manual, or wrap a tape (or string) around the wheels along the blade path with the tensioner at mid-travel and measure directly.
Sources & further reading
- Open-belt geometry: L = 2C + π(D₁ + D₂)/2. Exact when both wheels are the same size (the straight runs are parallel to the line of centers) and slightly short when they differ; derived on this page, no outside source
- Your bandsaw manual, which lists the factory blade length when you can find it
- Grizzly G0555LX 14-inch bandsaw, specifications: blade size 93-1/2 in
- Grizzly T25555 riser block kit for the G0555LX: cutting height goes from 6 in to 12 in and the blade length changes from 93-1/2 in to 105 in
Embed this calculator
Add this calculator to your site — copy the snippet below. Reword the credit or add rel="nofollow" to its link if you prefer.
Dark site? Append ?theme=dark to the iframe src.