Bearing L10 life is the basic rating life of a rolling bearing at 90% reliability per ISO 281. Use the formula L10 = (C/P)^p × 10⁶ revolutions where C = dynamic load rating, P = equivalent load, p = 3 for ball bearings or 10/3 for roller bearings per ISO 281.
ISO 281 Bearing Dynamic Load Life Calculator
Calculate bearing dynamic load rating, equivalent load, and L10/Average life for ball and roller bearings per ISO 281:206. Includes relubrication life adjustment.
Calculation Results
Equivalent dynamic bearing load.
Basic rating life in millions of revolutions.
Basic rating life in operating hours.
Expected average life (5 × L10).
Life adjustment for reliability.
Calculation Summary
| Radial Load | 5000N |
| Thrust Load | 1000N |
| Dynamic Load Rating (C) | 50000N |
| Speed Factor (na) | 1 |
| Bearing Type | 3 |
| Speed | 1500rpm |
| Equivalent Load (P) | 6250.00N KEY |
| L10 Life (Revolutions) | 6250.00Million Revs |
| L10 Life (Hours) | 6250.00hours |
| Average Life (Hours) | 6250.00hours |
| Reliability Factor (a1) | 6250.00 |
Mathematical Models & Equations
P = X × Fr + Y × FaL10 = (C / P)^pL10h = L10 × 10^6 / (60 × n)L_avg = a1 × a2 × L10 × 5Verification Calculation Log
- 1Retrieve input parameters from form controls.
- 2Substitute first active variable: Input = 5000.
- 3Sprint 3 Placeholder: Formula computations will activate in future releases.
Engineering Application Notes
Implements ISO 281:206 methodology for rolling bearing dynamic load rating calculations. Calculates L10 (90% reliability) and average life with speed and reliability adjustment factors. For roller bearings, use p=10/3.
Standard Citations & References
- ISO 281:206: Rolling bearings — Dynamic load ratings and rating life
- SKF Bearing Selection Guide
- NSK Catalog: Bearing Life Calculations