Mass-Energy Equivalence Calculator (E = mc²)
Mass-Energy Equivalence Calculator (E = mc²)
Einstein's mass-energy equivalence shows that mass and energy are interchangeable, related by the speed of light squared - an enormous conversion factor that means even tiny amounts of mass correspond to huge amounts of energy. Choose whether to solve for energy or mass, enter the known value, and this calculator computes the other.
- E = mc², where c is the speed of light (about 299,792,458 m/s) - so even 1 gram of mass equals about 8.99 × 10¹³ joules, comparable to the energy released by tens of kilotons of TNT.
- This is why nuclear reactions release so much energy - they convert a tiny fraction of mass directly into energy, unlike chemical reactions which barely touch the mass of the atoms involved.
- Results are shown in scientific notation when very large or very small, since mass-energy conversions routinely span many orders of magnitude.
How do I calculate energy from mass using E=mc²?
Multiply the mass by the speed of light squared: E = m × c², where c ≈ 299,792,458 m/s.
How much energy is in 1 gram of mass?
E = 0.001 × (299,792,458)² ≈ 8.99 × 10¹³ joules.
Mass-Energy Equivalence Calculator (E = mc²)
Einstein's mass-energy equivalence shows that mass and energy are interchangeable, related by the speed of light squared - an enormous conversion factor that means even tiny amounts of mass correspond to huge amounts of energy. Choose whether to solve for energy or mass, enter the known value, and this calculator computes the other.
- E = mc², where c is the speed of light (about 299,792,458 m/s) - so even 1 gram of mass equals about 8.99 × 10¹³ joules, comparable to the energy released by tens of kilotons of TNT.
- This is why nuclear reactions release so much energy - they convert a tiny fraction of mass directly into energy, unlike chemical reactions which barely touch the mass of the atoms involved.
- Results are shown in scientific notation when very large or very small, since mass-energy conversions routinely span many orders of magnitude.
How do I calculate energy from mass using E=mc²?
Multiply the mass by the speed of light squared: E = m × c², where c ≈ 299,792,458 m/s.
How much energy is in 1 gram of mass?
E = 0.001 × (299,792,458)² ≈ 8.99 × 10¹³ joules.