Toolnoza

ENGINEERING TOOL

Pulley Speed Calculator

Calculate driven pulley RPM, transmission ratio and driver belt speed with an optional slip allowance.

Pulley Speed Calculator

FREE ONLINE TOOL

Output speed

600 RPM

Transmission ratio

2.5

Ideal driver belt speed

7.854 m/s

Formula and assumptions

n2 = n1 × D1/D2 × (1−slip); vbelt = πD1n1/60

Use pitch diameters and a two-pulley belt drive. The belt speed shown is the ideal driver rim speed; slip reduces driven RPM. Does not check belt rating or shaft loads.

Technical reference: Gates — Belt Sizing Guide

STEP BY STEP

How to use pulley speed calculator

  1. Check the input units and assumptions.
  2. Review the result and example.

IN PRACTICE

Example

100 mm driver / 250 mm driven, 1500 RPM, no slip: 600 RPM and 7.854 m/s.

GOOD TO KNOW

Which model does this calculator use?

Use pitch diameters and a two-pulley belt drive. The belt speed shown is the ideal driver rim speed; slip reduces driven RPM. Does not check belt rating or shaft loads.

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