How do you figure the length for a bandsaw that doesn't have a blade to measure from?

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If you lost your bandsaw owner's manual and don't have a blade to measure from, or if you've added riser blocks, put this simple math formula to work to determine your tool's blade length:
Blade length = (2xA) + (3.14xB)

Key:
A= distance in inches between bandsaw wheel centers when the upper wheel is midway in its adjustment range
B= bandsaw wheel diameter