# E = mc² Calculator

> Convert mass to rest energy with Einstein’s mass-energy equivalence.

Page: https://askcalculators.com/calculator/e-mc2-calculator/
Definition: https://askcalculators.com/calculator/e-mc2-calculator/definition.json
JSON Schema: https://askcalculators.com/calculator/e-mc2-calculator/schema.json
Version: 1.0.0
Maintained by: AskCalculators (software project; not a credentialed reviewer)
Qualified review: pending. Automated checks do not establish professional approval.
Page status: Live
Review status: Pending

## Use
Open the calculator page and enter values. Query-string parameters can restore and bookmark a calculation.
Example: https://askcalculators.com/calculator/e-mc2-calculator/?mass=1

## Inputs
- mass: Mass (kg); type=number; required; default=1; min=0

## Outputs
- energy: Energy (joules); format=number; primary
- kilowattHours: Energy (kWh); format=number
- tntEquivalent: TNT equivalent (metric tons); format=number

## Formula
E = mc², where c = 299,792,458 m/s

## Rules
- Empty optional inputs are undefined, not zero.
- Hidden conditional inputs are ignored.
- Do not invent missing required inputs.