Free Bearing Life Calculator
Estimate the basic rating life of a rolling-element bearing in hours using the L10 life formula.
L10 Life (hours)
1,389 hours
L10 Life (hours) vs Dynamic Load Rating (C)
Rolling Bearing L10 Life
The L10 life is the number of revolutions (or hours) at which 90% of identical bearings will survive.
Formula
L10 = (C/P)^p x 10^6 revolutions
L10h = L10 / (60 N) (hours)
where C is the dynamic load rating from the manufacturer, P is the equivalent dynamic bearing load, N is speed in RPM, and p is the life exponent (3 for ball bearings, 10/3 for roller bearings).
Example Calculation
A ball bearing with C=50 kN, operating load P=10 kN, at 1500 RPM.
- 01C/P = 50/10 = 5
- 02L10 = 5^3 x 10^6 = 125 x 10^6 = 125,000,000 rev
- 03L10h = 125,000,000 / (60 x 1500) = 1,388.9 hours
- 04At 8 hours/day, this is about 174 operating days.
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