What is L10 bearing life?

L10 life is the basic rating life associated with a 90% reliability rate, representing the number of revolutions that 90% of a group of identical bearings will achieve or exceed before fatigue occurs.

How does the bearing type affect the calculation?

The calculation uses different exponents based on contact geometry: p = 3 for ball bearings (point contact) and p = 10/3 for roller bearings (line contact).

What units should I use for the loads?

Both the dynamic load rating (C) and the equivalent load (P) must be entered in Newtons (N) to ensure correct calculation.

Is shaft speed required for the calculation?

No, speed is optional. If omitted, the tool calculates life in millions of revolutions. If provided, it also outputs the life in operating hours (L10h).

Does this calculator account for lubrication or contamination?

No, this calculator computes the basic rating life (L10) according to ISO 281. It does not calculate the adjusted rating life (Lnm) which considers lubrication, contamination, or reliability factors.

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Bearing Life L10 Calculator

Calculate the basic rating life of a rolling bearing: L10 = (C/P)^p, with p = 3 for ball bearings and p = 10/3 for roller bearings. When a speed is provided, converts to L10h in operating hours.

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1 examples

Ball bearing: C=22000 N, P=4400 N

p=3. L10 = (22000/4400)^3 = 5³ = 125 (×10⁶ rev).

{"result":"Ball bearing life L10 = (C/P)^p = (22000/4400)^3 = 5^3 = 125 × 10⁶ revolutions.","metadata":{"input":{"bearingType":"ball","dynamicLoadRating":22000,"equivalentLoad":4400},"result":{"l10":125,"l10Unit":"million revolutions","exponent":3,"bearingType":"ball"}}}

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5 options

SettingsAdjust formats, ranges, numbers, and modes.5

Bearing TypeselectOptionalDynamic Load Rating C (N)numberRequiredEquivalent Load P (N)numberRequiredSpeed n (rpm)numberOptionalOptional. If provided, the life in hours L10h = L10 × 10⁶ / (60 · n).Decimal PlacesnumberOptional

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Bearing Life L10 Calculator

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Examples

1. Calculating Ball Bearing Life for an Electric Motor

2. Evaluating Roller Bearing Life for a Heavy Conveyor

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