Bearing Life Calculator (ISO 281)

Calculate the basic rating life (L10) and adjusted rating life (L10a) of rolling element bearings according to ISO 281:2007. Enter the bearing parameters and operating conditions below.

Bearing Parameters

Bearing Type

Dynamic Load Rating (C) N

Static Load Rating (C0) N

Operating Conditions

Radial Load (Fr) N

Axial Load (Fa) N

Rotational Speed (n) rpm

Radial Factor (X)

Axial Factor (Y)

Life Adjustment (ISO 281:2007)

Reliability Factor (a1)

Life modification factor (aISO)

Results

Equivalent Dynamic Load (P) –

Load Ratio (C/P) –

Basic Rating Life (L10) –

Basic Rating Life (L10h) –

Adjusted Rating Life (L10a) –

–

Adjusted Rating Life (L10a) in hours

L10 = (C/P)^p × 10⁶ revolutions
L10h = L10 / (60 × n) hours
L10a = a1 × aISO × L10

Note: This calculator provides theoretical bearing life estimates. Actual bearing life depends on lubrication conditions, contamination, alignment, temperature, and other factors. For critical applications, consult the bearing manufacturer's engineering data.