Calculator cluster

Belts & Pulleys Calculators

Belt length, pulley ratio, RPM, center distance, belt speed, tension, frequency, and wrap-angle calculators for belt drives.

12 calculators in this cluster

Belt-drive calculations usually start with geometry and speed ratio, then move into belt speed, wrap, tension, and transmitted power. Keeping those steps separate makes it easier to check whether a proposed drive is geometrically possible before applying manufacturer-specific belt ratings.

The calculators in this cluster use ideal geometry or basic mechanics unless a page states otherwise. They are useful for layout work, quick checks, and troubleshooting, but final belt selection should still follow the belt manufacturer's rating tables, service factors, minimum pulley sizes, and installation-tension procedure.

A practical calculation workflow

Step 1

Size the layout

Estimate the open-belt length from pulley diameters and shaft center distance, then compare the result with an available standard belt length.

Open Belt Length

Step 2

Check speed ratio

Use driver and driven diameters to verify the expected speed reduction or increase before checking belt speed.

Open Pulley RPM

Step 3

Check operating conditions

Use belt speed, wrap angle, and tension-related tools as screening calculations before applying product-specific ratings.

Open Belt Speed

All Belts & Pulleys calculators

Choose the variable you know and the quantity you need to solve. Each tool shows its formula, default worked example, and nearby calculations.

Belt Length Calculator

Calculate approximate open-belt length from pulley diameters and center distance, with metric and imperial results.

Pulley Ratio Calculator

Calculate belt-drive speed ratio from driver and driven pulley diameters.

Pulley RPM Calculator

Calculate driven pulley RPM from driver RPM and pulley diameters.

Pulley Diameter Calculator

Calculate the driven pulley diameter needed for a target RPM.

Belt Speed Calculator

Calculate belt linear speed from pulley diameter and rotational speed.

Belt Center Distance Calculator

Estimate pulley center distance from belt length and two pulley diameters.

Pulley Wrap Angle Calculator

Calculate approximate belt wrap angle on the small and large pulleys of an open belt drive.

Pulley Torque Ratio Calculator

Estimate ideal driven-shaft torque from input torque and driver/driven pulley diameters.

Belt Effective Tension Calculator

Calculate effective belt pull from transmitted mechanical power and belt linear speed.

Belt Power Calculator

Calculate mechanical power transferred by a belt from effective tension and belt speed.

Belt Frequency Tension Calculator

Estimate belt span tension from measured natural frequency, span length, and belt mass per unit length.

Belt Natural Frequency Calculator

Estimate belt span natural frequency from static tension, free span length, and belt mass per unit length.

Practical notes