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Bearing Life (L10)
Calculate L10 and L10h from C, P, type, and rpm.
Calculator tabs
Inputs
Enter bearing ratings and speed.
Results
Basic rating life from the standard equation.
L10 (million rev)
15.63
L10h (hours)
173.61
Lna, adjusted life (million rev)
15.63
Lnah, adjusted life (hours)
173.61
Exponent p
3.000
How it is calculated
Formulas used
L10 = (C / P)^p
L10h = (L10 * 10^6) / (60 * n)
Lna = a1 * L10
Lnah = a1 * L10h
Variables
- C
- Dynamic load rating.
- P
- Equivalent load.
- p
- Exponent (3 for ball, 10/3 for roller).
- a1
- Reliability adjustment factor.
- n
- Speed (rpm).
- L10
- Basic rating life (million rev).
- L10h
- Basic rating life in hours.
- Lna
- Life adjusted by a1; it is not labelled L10 when a1 differs from 1.
Usage notes
- Assumes constant load and speed.
- Based on standard rating life equation.
Show reports, charts, and comparison tools
After checking the basic result, open sharing, PDF, method notes, and comparison panels.
Tool-Specific Documentation
Bearing Life (L10)Scope: What does this tool calculate?
Calculates basic L10/L10h life from dynamic capacity C, equivalent load P, bearing type, and speed, then applies the a1 factor for an adjusted Lna estimate.
Assumptions and Units
- Enter C and P in the same load unit; L10 is reported in million revolutions and L10h in hours.
- The model assumes constant load and speed; p=3 is used for ball bearings and p=10/3 for roller bearings.
- a1 is a user-supplied multiplier for the basic L10 value; actual reliability and operating conditions need separate verification.
Limits / Boundaries
- Lubrication, contamination, misalignment, temperature, mounting, and variable-load effects are not resolved in this quick model.
- The L10 result is not a bearing-selection or service-life guarantee; verify it with the manufacturer catalogue and project load spectrum.
Applicable References
- ISO 281 (rolling bearing life calculations)
- Verification against manufacturer catalogue data and the project specification
Validation Example
Basic L10 check
| Input | Expected Output |
|---|---|
| C=25 kN, P=10 kN, ball bearing, n=1500 rpm, a1=1 | L10=15.625 million revolutions; L10h≈173.6 hours |
Note: Cross-check the result against the actual load spectrum, manufacturer data, and project conditions.
Version and Update
- Version
- v1.0.0
- Last updated
- 2026-02-07
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