Mass–energy Equivalence Calculator
☢ Nuclear & Decay. Use the Mass–energy equivalence formula to find energy, mass change δm: pick the value you want, type the others, and the answer updates as you go.
In nuclear units: 1 u of mass = 931.5 MeV.
Energy92.218 MeV
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 | MeV |
| Mass change Δm | u |
Worked example
Find the energy when Mass change Δm = 0.099 u.
Using E = Δ m c²: Energy = 92.218 MeV.
Frequently asked questions
What is the formula for Mass–energy equivalence?
E = Δ m c². In nuclear units: 1 u of mass = 931.5 MeV.
What do the letters stand for, and what units are used?
Energy in MeV, Mass change Δm in u.
How do you calculate energy?
Put the values into E = Δ m c². For example, with Mass change Δm = 0.099 u, energy = 92.218 MeV.
Can I solve for a different value?
Yes. In the calculator above, pick the circle next to any value (energy, mass change δm) and fill in the others: it rearranges the formula for you.
