E = mc² Calculator

Find the energy equivalent of a mass.

Energy (J) 89,875,517,873,681.77

Energy (kilotons TNT) 21.481

Formula: E = m · c²

Step-by-step with your numbers:

1. Values used:

2. Mass = 0.001

4. Energy = 89,875,517,873,681.77J

5. Energy = 21.481kilotons TNT

Did we solve your problem today?

Einstein's equation gives the enormous energy stored in mass.

The math behind it

E = mass × speed of light² (c = 3 × 10⁸ m/s).

1 gram → 8.99 × 10¹³ J (~21.5 kilotons TNT).

Why so much?

c² is a huge multiplier — tiny mass yields immense energy.