Mechanical & Civil Engineering
Ball Bearing L10 Life Calculator
Estimate the L10 fatigue life in millions of revolutions for a ball bearing under load.
Your inputs
Change any value to update the result instantly.
L10 life
125 million rev
L10 life in hours
1,388.9 hr
Load ratio C/P
5
Speed
1,500 rpm
What this calculator does
Ball Bearing L10 Life Calculator: Applies the standard machine-element relationship used in design textbooks so the capacity, rating or geometry can be worked out step by step.
What your result means
The headline figure is the capacity, rating or geometric result for the element you described. Compare it with the manufacturer's rating and your required service factor.
Formula and working
L10 = (C/P)^3
- 1
Collect the inputs
Basic dynamic load rating (C) = 15,000 N; Equivalent dynamic load (P) = 3,000 N; Rotational speed = 1,500 rpm
- 2
Apply the formula
L10 = (C/P)^3
- 3
Result
L10 life = 125 million rev
Frequently asked questions
Symbols and assumptions
- dynamicRating
- Basic dynamic load rating (C) (N)
- equivalentLoad
- Equivalent dynamic load (P) (N)
- speed
- Rotational speed (rpm)
- • Standard textbook geometry and steady operating conditions are assumed; shock, misalignment and wear factors are not applied automatically.
- • Material and surface-finish allowances must be chosen by the user for their actual component.
Sources and review
Reviewed 2026-09-22 · Next review 2027-09-22
- • This is an educational estimate for learning and checking, not a design deliverable.
- • Real design must follow the governing code or standard for your jurisdiction and be reviewed and signed off by a qualified engineer.
- • Safety factors, load combinations and material certification are the responsibility of the designer, not of this page.
Important limitation
This is an educational estimate based only on the values and formula shown. Verify current rates, rules, units, and professional standards before relying on the result. It is not personalized financial or investment advice.
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