engineering

Bearing Life Calculator

Calculate L10 bearing life in revolutions and hours for ball and roller bearings using basic dynamic load rating

Bearing Life Calculator

Calculate L₁₀ bearing life in revolutions and hours for ball and roller bearings.

Formula

L₁₀ = (C/P)^p × 10⁶ revolutions
p = 3 (ball), 10/3 (roller)
L_adj = a₁ · L₁₀   (reliability adjustment)
L₁₀h = L₁₀ / (60 × n) hours

From bearing catalog

P = X·Fr + Y·Fa

L₁₀ Life (90% Reliability)

L₁₀ (revolutions)

2.700e+7

L₁₀ at 1500 RPM

300 h

Calculation

C/P = 30000/10000 = 3.0000
(C/P)^p = (3.0000)^3.0000 = 27.0000
L₁₀ = 27.0000 × 10⁶ rev

Typical Design Life Targets

Electric motors: 20,000 hIndustrial gearboxes: 30,000 hAutomotive: 3,000–5,000 hPrecision equipment: 50,000 h

How to Use This Calculator

1

Enter your input values

Fill in all required input fields for the Bearing Life Calculator. Most fields include unit selectors so you can work in your preferred unit system.

2

Review your inputs

Double-check that all values are correct and that you have selected the right units for each field. Incorrect units are the most common source of calculation errors.

3

Read the results

The Bearing Life Calculator instantly computes the output and displays results with units. All calculations happen in your browser — no loading time and no data sent to a server.

Formula Reference

Bearing Life Calculator Formula

See calculator inputs for the governing equation

Variables: All variables and their units are labeled in the calculator interface above.

When to Use This Calculator

  • •Use the Bearing Life Calculator when solving homework or exam problems that require quick numerical verification of your hand calculations.
  • •Use it during the design phase to rapidly iterate on parameters before running detailed finite element simulations.
  • •Use it when reviewing a colleague's calculation or checking a vendor's data sheet for plausibility.
  • •Use it to generate reference data for a technical report or presentation without manual computation.

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