Pulley / Belt Drive Ratio Calculator

🧮 Pulley / Belt Drive Ratio Calculator

Enter parameters and get instant results to guide your selection.

Enter drive/driven pulley parameters to calculate the ratio, driven speed and belt linear speed.

⚙️ Method A: By diameter (V-belt pulleys)

Drive pulley D₁ (mm)

Driven pulley D₂ (mm)

Drive speed n₁ (rpm)

⚙️ Method B: By teeth (timing belt)

Drive teeth Z₁

Driven teeth Z₂

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⚠️ Results are for reference only. Always verify against official brand catalogs and qualified engineers. View all tools →