Physics Tool
E = mc² Calculator
Explore Einstein's theory of relativity by calculating the energy equivalent of mass.
Energy in Joules
8.9876e+16 J
In Kilowatt-hours (kWh)
2.4965e+10
Tons of TNT Equivalent
2.1481e+4 Kt
Calculated using c = 299,792,458 m/s
Σ The Formula
Energy (E) = mass (m) × speed of light (c)²
Real World Examples
One Kilogram
1 kg of mass is equivalent to ~90 Quadrillion Joules of energy.
Single Gram
Even a single gram contains enough energy to power a city for years.
# About This Calculator
Einstein's most famous equation, E = mc² (Mass-Energy Equivalence), states that energy and mass are the same thing, just in different forms. It shows that a very small amount of mass can be converted into a tremendous amount of energy.
In this formula:
- E is the energy (Joules).
- m is the mass (Kilograms).
- c is the speed of light (~300,000,000 meters per second).
How To Use
- Enter the **Mass** of the object.
- Select the **Unit** (kg, g, or lb).
- The **Joules**, **kWh**, and **TNT equivalent** are calculated instantly.
- Observe how the energy values change when you modify the mass.
Frequently Asked Questions
Does this mean I can turn mass into electricity?+
In theory, yes. Processes like nuclear fission (in power plants) and fusion (in the sun) work by converting a small fraction of mass into energy using exactly this principle.
Is the speed of light exact?+
Yes. The speed of light in a vacuum is defined as exactly 299,792,458 meters per second.
Is E = mc² Calculator free to use?+
Yes, E = mc² Calculator on Matheric is completely free to use. We believe in accessible education and utility for everyone.
How accurate is E = mc² Calculator?+
We use standard mathematical formulas and high-precision computing algorithms to ensure results for E = mc² Calculator are accurate for academic and professional use.
Can I use E = mc² Calculator on my phone?+
Yes! E = mc² Calculator is fully responsive and optimized for all devices, including smartphones, tablets, and desktops.
Do you save my data?+
No. We prioritize your privacy. All calculations are performed in your browser or temporarily processed, and we do not store your personal input data.
About
Einstein's most famous equation, E = mc² (Mass-Energy Equivalence), states that energy and mass are the same thing, just in different forms. It shows that a very small amount of mass can be converted into a tremendous amount of energy.
In this formula:
- E is the energy (Joules).
- m is the mass (Kilograms).
- c is the speed of light (~300,000,000 meters per second).