Velocity Addition Calculator

Add velocities the relativistic way.

Combined velocity (c) 0.8824

Formula: w = (u + v) ÷ (1 + u·v/c²)

Step-by-step with your numbers:

1. Values used:

2. Velocity u (fraction of c) = 0.6 c

3. Velocity v (fraction of c) = 0.6 c

5. Combined velocity = 0.8824c

Did we solve your problem today?

Velocities don't simply add near light speed — relativity keeps the result below c.

The math behind it

w = (u + v) ÷ (1 + uv/c²), using fractions of c. The result never exceeds c.

0.6c + 0.6c → about 0.882c, not 1.2c.

What if one velocity is c?

The result is exactly c — light moves at c in every frame.