CosmosCalc is a free collection of science tools and articles for anyone who wants to explore the universe through numbers.
CosmosCalc is a free science tool site covering physics, astronomy, aerospace, and nuclear science. Every calculator on this site runs entirely in your browser — no account required, no data collected, free forever.
We believe science should be accessible to everyone. Whether you're a student checking your homework, a hobbyist planning a stargazing night, or just someone who thinks the universe is fascinating — these tools are for you.
| Topic | Tools Available | Who It's For |
|---|---|---|
| ⚛️ Physics | Kinetic energy, gravity, waves, Ohm's Law, free fall, photon energy | Students Engineers |
| 🔭 Astronomy | Escape velocity, moon phases, orbital periods, light-year conversions | Enthusiasts Students |
| 🚀 Aerospace | Mach speed, delta-V, thrust-to-weight ratio, orbital velocity | Engineers Students |
| ☢️ Nuclear | Radioactive decay, half-life reference, E=mc² converter | Students Researchers |
Jump into our free science tools — from escape velocity to radioactive decay.
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