Mass–energy Calculator
⚛ Modern physics. Use the Mass–energy formula to find energy, mass: pick the value you want, type the others, and the answer updates as you go.
Energy8.988 × 10¹³ J
Pick the ○ next to the value you want to find, fill in the others, and it solves as you type.
What each letter means
| Quantity | Unit |
|---|---|
| Energy | J |
| Mass | kg |
Worked example
Find the energy when Mass = 0.001 kg.
Using E = mc²: Energy = 8.988 × 10¹³ J.
Frequently asked questions
What is the formula for Mass–energy?
E = mc².
What do the letters stand for, and what units are used?
Energy in J, Mass in kg.
How do you calculate energy?
Put the values into E = mc². For example, with Mass = 0.001 kg, energy = 8.988 × 10¹³ J.
Can I solve for a different value?
Yes. In the calculator above, pick the circle next to any value (energy, mass) and fill in the others: it rearranges the formula for you.
