Belt Drive Calculator
Calculate belt length, speed ratio, belt tensions, and required belt width for V-belt and flat-belt drives
Belt Drive Calculator
Calculate belt length, speed ratio, angle of wrap, and belt tensions for open belt drive systems.
Formulas
Flat rubber: 0.3–0.5 | V-belt: 0.5–0.7
Belt Geometry
Belt Length L
2.3139 m
Speed Ratio i
2.0000
Wrap Angle (small pulley)
169.24°
= 2.9538 rad
Driven Speed n₂
750.0 RPM
Belt Speed v
23.562 m/s
Belt Tensions
Tight Side F₁
361.0 N
Slack Side F₂
148.8 N
Effective F_e = F₁−F₂
212.2 N
Design Rule: Center Distance
How to Use This Calculator
Enter your input values
Fill in all required input fields for the Belt Drive Calculator. Most fields include unit selectors so you can work in your preferred unit system.
Review your inputs
Double-check that all values are correct and that you have selected the right units for each field. Incorrect units are the most common source of calculation errors.
Read the results
The Belt Drive Calculator instantly computes the output and displays results with units. All calculations happen in your browser — no loading time and no data sent to a server.
Formula Reference
Belt Drive Calculator Formula
See calculator inputs for the governing equation
Variables: All variables and their units are labeled in the calculator interface above.
When to Use This Calculator
- •Use the Belt Drive Calculator when solving homework or exam problems that require quick numerical verification of your hand calculations.
- •Use it during the design phase to rapidly iterate on parameters before running detailed finite element simulations.
- •Use it when reviewing a colleague's calculation or checking a vendor's data sheet for plausibility.
- •Use it to generate reference data for a technical report or presentation without manual computation.
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