Before measuring manually, you should know that Sawblade.com has an extensive database of bandsaw makes and models.
So, if you don't feel like mathing, and if you already know your machine’s brand and model number, you can use the Blade Wizard located on every blade ordering page to find the correct length — no calculation required and we will even load the results in the form for ya!
However, if your bandsaw is older, modified, missing its label, or you simply want to double-verify the size, measuring the saw yourself is the most reliable method. Determining blade length is easy once you understand two key measurements — wheel diameter and axle spacing. When combined, they provide the exact length you need to order a replacement blade with confidence.
Start by setting your tension mechanism about one-third of the way from fully closed. This allows room for adjustment during installation while giving you a true operating range for accurate measurement. Then follow the steps below to calculate your blade length.
Now, for the Math-ing part
1) Adjust the tension mechanism to roughly one-third from fully tightened.
2) Measure the diameter of each wheel where the blade runs.
• Multiply each diameter by 3.14 (π).
• On a two-wheel saw, divide each result by two, then add both values.
Example:
14" wheel → 14 × 3.14 = 43.96 ÷ 2 = 21.98
12" wheel → 12 × 3.14 = 37.68 ÷ 2 = 18.84
Wheel total = 21.98 + 18.84 = 40.82"
3) Measure the distance between wheel axles (center-to-center).
• Two-wheel saw → multiply this distance by two.
• Three or more wheels → measure axle-to-axle around the loop until you return to the start.
Example:
Axle spacing = 36" → 36 × 2 = 72"
4) Add axle distance to wheel total to get blade length:
40.82" + 72" = 112.82"
5) Convert to feet/inches if needed:
112.82" ≈ 9' 4 13/16"
Your final number is the blade length you should order for your saw.
If you have any questions or want help verifying your measurements, call Sawblade.com at 800-754-6920. Our experienced customer service professionals are ready to assist.
