donut_largeMechanical Design

Bearing Life Calculator

Calculate bearing L10 life (basic rating life) based on dynamic load rating, equivalent load, and operating speed.

check_circleL10 Life: Basic rating life in millions of revolutions.
check_circleHours of Life: Estimated operating hours at given RPM.
check_circleBall vs Roller: Different exponents for bearing types.
check_circleIndustry Standard: Based on ISO 281 bearing life calculation.

Bearing Life Calculator

Units:

mminch

Dynamic Load Rating (C)

Equivalent Dynamic Load (P)

Rotational Speed

RPM

Bearing Type

school Theory & Formulas

Bearing Life Formula (ISO 281):

L10 (millions of revolutions):
L₁₀ = (C / P)^p

L10h (hours):
L₁₀h = (10⁶ × L₁₀) / (60 × n)

Where:
- C = Dynamic load rating (from bearing catalog)
- P = Equivalent dynamic load
- p = Exponent (3 for ball, 10/3 for roller)
- n = Rotational speed (RPM)

Reliability Factors:
- L10 = 90% reliability
- L5 = 95% reliability (0.62 × L10)
- L1 = 99% reliability (0.21 × L10)