E=mc² shows that a tiny amount of mass contains enormous energy. 1 kg of matter = 9 × 10^16 joules.
1 gram of uranium-235 completely fissioned releases ~24 MWh — enough to power a US home for 2+ years.
Use this calculator whenever this type of everyday calculation needs to be done accurately and quickly. The tool eliminates the mental arithmetic errors that occur under time pressure or with unusual numbers.
A common mistake is misidentifying which formula applies to the specific version of the problem. Many everyday calculations have superficially similar variants that use different formulas — always check which scenario matches your situation.
A freelancer calculates the exact number of working days between a project start and deadline, accounting for weekends and public holidays. The result tells them whether the timeline is achievable before accepting the brief — not after.
E = 1 × (3×10⁸)² = 9 × 10^16 joules = 25 billion kWh. But practical nuclear conversion is ~0.1%.
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