Free Engineering Tools
Engineering Calculators built by engineers
Quick, accurate, mobile-friendly tools for the calculations you do every day. No sign-up, no friction — and every result ends with a direct path to quote the part you need.
Belt Length & Centre Distance Calculator
Find the belt length for a two-pulley drive, or work back to the centre distance for a given belt. Metric & imperial.
Calculate belt lengthBelt Speed & RPM Calculator
Enter driver RPM and both pulley diameters to get the driven shaft speed and belt speed in m/s and ft/min.
Calculate belt speedBearing Failure Diagnosis Wizard
Answer three questions about the damage and get the likely failure mode, root causes and prevention advice.
Diagnose a failureChain Length Calculator
From our sister company Chain Supply UK — calculate roller chain length for two-sprocket drives.
Bearing Interchange Search
Cross-reference any competitor's bearing part number to an equivalent in our 17,000+ line bearing stock.