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Bearing life calculator: L10 rating life per ISO 281
Basic rating life L10 in hours and million revolutions from C, equivalent load and speed, with combined loads, duty cycles and factor a1. Free.
- Instant result
- Formula and standards shown
- On desktop and phone
Result
4,502hL10h life
- L10 life
- 405.2Mrev
- Equivalent load P
- 2.000kN
- Factor a1
- 1.000
- Life at target reliability
- 4,502 h
- Caution : Lubrication and contamination are ignored (aISO = 1).
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Bearing life kept with the machine's history
Here, the calculator is free and the result is gone when you close the page. In Reglova, it is attached to the work order on the right machine: you find it again at the next breakdown, and on audit day.
The CMMS software comparison, our gaps included- Attached to the work order with its inputs: the server recalculates it, it stays verifiable.
- On the technician's phone, even without a network.
- In the machine's history, for the next breakdown.
- The asset's nameplate data pre-fills the calculation.
When to check an L10 bearing life
01
Check that a replacement bearing will last the required time before ordering it.
02
Compare two arrangements, ball or roller, for the same load.
03
Explain repeated failures: an actual load above the original design load shortens life quickly.
Good to know
The basic L10 life ignores lubrication and contamination (aISO = 1). For a ball bearing, life varies with the cube of C/P: 10% more load means about 25% less life.
L10 life formula and equivalent load
The basic rating life L10 is the number of revolutions that 90% of a group of identical bearings reach or exceed. It follows from the basic dynamic load rating C in the catalogue and the equivalent load P. The calculator gives it in million revolutions and in hours, for a single load, a combined radial and axial load or a cycle of four loads, and adjusts it to a higher reliability (factor a1).
Formula · Reference documents
L10 = (C/P)^p, p = 3 (ball) or 10/3 (roller) ; L10h = 10⁶/(60·n)·L10 ; Lnm = a1·L10 ; P = X·Fr + Y·Fa ; Pm = (Σ Pi^p·qi / Σ qi)^(1/p)
ISO 281:2007 ; SKF, Rolling bearings
Inputs and accepted ranges
| Input | Unit | Accepted range | Example |
|---|---|---|---|
| Dynamic load rating C | kN | 0.1 to 10,000 | 14.8 kN |
| Rolling elements | 2 options | Ball | |
| Speed | rpm | 1 to 100,000 | 1,500 rpm |
| Target reliability | 8 options | 90 % | |
| Load | 3 options | Equivalent load | |
| Equivalent load Pif Load: Equivalent load | kN | 0.001 to 100,000 | 2 kN |
| Radial load Frif Load: Radial and axial | kN | 0 to 100,000 | |
| Axial load Faif Load: Radial and axial | kN | 0 to 100,000 | |
| Static load rating C0if Load: Radial and axial | kN | 0.1 to 10,000 | Optional |
| Factor f0if Load: Radial and axial | 5 to 20 | Optional | |
| Load 1if Load: Load cycle | kN | 0.001 to 100,000 | Optional |
| Time share 1if Load: Load cycle | % | 0.01 to 100 | Optional |
| Load 2if Load: Load cycle | kN | 0.001 to 100,000 | Optional |
| Time share 2if Load: Load cycle | % | 0.01 to 100 | Optional |
| Load 3if Load: Load cycle | kN | 0.001 to 100,000 | Optional |
| Time share 3if Load: Load cycle | % | 0.01 to 100 | Optional |
| Load 4if Load: Load cycle | kN | 0.001 to 100,000 | Optional |
| Time share 4if Load: Load cycle | % | 0.01 to 100 | Optional |
Calculated results
- L10h lifeh
- L10 lifeMrev
- Equivalent load PkN
- Factor a1
- Life at target reliabilityh
- Factor e
- Factor X
- Factor Y
What the calculator flags
- Lubrication and contamination are ignored (aISO = 1).
- Load above half of C: the formula is no longer reliable.
- Very light load: risk of rolling element skidding.
- f0·Fa/C0 outside the table: value clamped.
- Time shares do not add up to 100%: they are scaled to 100%.
Bearing changes logged in the machine history
- Breakdowns reported by QR code
- Work orders on the phone, even without a network
- Mandatory inspections reminded by email
- Audit file as a PDF, in one click
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