This application calculates belt length for 2 pulleys.
Please set 2 pulleys radius and distance of axles, you get lap length for 2 pulleys.
When you tap the pulleys or line between axis, The spin button will be occurred.
The unit was not decided, please take unit for each purpose.
The values was calculated by simple geometry.
Deflection and margin, dose not include this value, such as contact surface of the V-belt.