How does the Belt Drive Calculator work?

Calculate: Speed ratio = D_driven / D_driver where D is pulley diameter Then: Torque: T = P / ω (power divided by angular velocity) Then: Tension and slippage determine power capacity.

Can you give an example of how to use the Belt Drive Calculator?

Example: Input Driver 100 mm diameter at 1800 rpm, driven 200 mm gives a result of Output speed = 900 rpm, 2:1 reduction (Torque doubles).

Is the Belt Drive Calculator free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Belt Drive Calculator?

Our Belt Drive Calculator uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

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Belt Drive Calculator

Drive Pulley Diameter (in)

Driven Pulley Diameter (in)

Center Distance (in)

Drive Pulley RPM

Belt drive transmits power between shafts using flexible belt around pulleys. It's simple, quiet, and provides overload protection through slipping.

Symbol	Name	Unit	Description
D	D value	—	Variable used in the calculation

Difficulty:intermediate

References

›Belt Drive — Wikipedia

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Belt Drive Calculator

Belt Drive Calculator

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Belt Drive Calculator