Bearing Life Calculator

Estimate L10 bearing life (hours) | ⚙️ Based on dynamic load, equivalent load & speed

📊 Dynamic Load (C) — kN

⚖️ Equivalent Load (P) — kN

🔄 Speed (n) — RPM

🔢 Life Exponent (p)

Presets:

L10 Bearing Life (hours)

0.00

Hours at 90% reliability

Millions of Revs

0.00

Load Ratio (C/P)

0.00

Life (years) @ 24/7

0.00

📐 L₁₀ = (C/P)ᵖ × 10⁶ / (60 × n) (hours)

📖 How to Use This Bearing Life Calculator

Enter dynamic load rating (C) – Found in bearing catalogs (kN).

Enter equivalent load (P) – Actual load on the bearing (kN).

Set rotational speed (n) – Operating speed in RPM.

Choose life exponent (p) – 3 for ball, 10/3 for roller bearings.

L10 life is the number of revolutions (or hours at a given speed) that 90% of bearings will achieve before fatigue. The standard formula is:

L₁₀ (hours) = (C / P)ᵖ × 10⁶ / (60 × n)

What does L10 mean?

L10 is the life at which 90% of bearings are expected to survive. It's the most common rating life.

Ball vs roller bearing exponent?

Ball bearings have p = 3. Roller bearings have p = 10/3 ≈ 3.33.

How to find dynamic load rating C?

From bearing manufacturer catalogs (SKF, NSK, Timken).

What is a good bearing life?

10,000–30,000 hours for general machinery, 50,000+ for critical equipment.