E = mc² Calculator

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Calculates the energy equivalent of mass (or vice-versa) using Einstein's famous equation.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Mass (kg) and Energy (J) in the units shown.

Step 2

Read Speed of Light (m/s), Mass (kg), and Energy (J) in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

See the inputs and their calculated results.

Mass (kg): 1 kg; Energy (J): 0 J

Speed of Light (m/s): 299,792,458 m/s; Mass (kg): 0 kg; Energy (J): 89,875,517,870,000,000 J

Mass (kg): 0.001 kg; Energy (J): 0 J

Speed of Light (m/s): 299,792,458 m/s; Mass (kg): 0 kg; Energy (J): 89,875,517,870,000 J

Mass (kg): 10 kg; Energy (J): 0 J

Speed of Light (m/s): 299,792,458 m/s; Mass (kg): 0 kg; Energy (J): 898,755,178,700,000,000 J

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