Bearing Life Estimator
Basic rating life only: L10 = (C/P)^p million revolutions, with p=3 for ball bearings and p=10/3 for roller bearings. Hours = L10 × 1,000,000 ÷ (60 × rpm). At zero rpm, time-based life is undefined. This does not select a product or establish actual service life; reliability, lubrication, fit, contamination, misalignment, temperature and application conditions are outside scope.
Estimated basic rating life
- million revolutions
- operating hours
- years at stated annual hours
A QUICK WALKTHROUGH
How to use this tool
- Enter rated C, equivalent load, speed, and annual operating hours.
- Use finite positive C and P, nonnegative speed, and positive annual hours.
- Estimate life
Formula and scope
Basic rating life only: L10 = (C/P)^p million revolutions, with p=3 for ball bearings and p=10/3 for roller bearings. Hours = L10 × 1,000,000 ÷ (60 × rpm). At zero rpm, time-based life is undefined. This does not select a product or establish actual service life; reliability, lubrication, fit, contamination, misalignment, temperature and application conditions are outside scope.
Source basis and data boundary
Source basis: SKF rolling-bearing basic rating-life method. This page implements only the stated basic L10 relationship and does not reproduce a catalogue or product data. Reference: https://evolution.skf.com/the-skf-formula-for-rolling-bearing-life/
Browser processing
Inputs and reports stay in this browser; no bearing catalogue or product dataset is bundled.
GOOD TO KNOW
Common questions
Which load rating should I enter?
Enter a traceable manufacturer basic dynamic load rating C and an application-specific equivalent dynamic bearing load P in the same units. The page supplies no bearing data or defaults.