About This Launch
Calculator Cosmos is a set of free, browser-based calculators for maths, money, health, fitness and time. Every answer shows the formula and working so you can verify it. No account required; inputs stay on your device.
Why I Built This
Most online calculators give a number with no explanation. I wanted free calculators that show the formula and working, so anyone can check the answer, with no sign-up.
Launch Details
CategoryProductivity
StageLive
ListedOctober 14, 2026