Everyday calculators & unit converters, free
Math, algebra, geometry, unit conversion, physics and engineering calculators. Scientific calculator, fractions, equations, Ohm's law and 50+ tools that run locally.
In-content · after first value section
Why CalcSphere?
One fast engine for all everyday math: exact formulas, steps, unit tables and offline support — no account, no waiting, no uploads.
FAQ
Is it free?
Yes — every tool is free with no signup and no credits.
Is my data uploaded?
No. Tools run locally in your browser; files never leave your device. Check DevTools → Network.
Does it work offline?
After the first visit the app shell is cached, so calculators and generators keep working offline.
Does it work on mobile?
Yes — touch-friendly, one-tap download, adaptive workers for weak devices.
How do you make money?
Clearly-labeled ads, spaced away from buttons. No paywall, no fake download buttons.
Guides
Fractions without fear: a 10-minute guide · Unit conversion: exact factors vs approximations · Ohm's law in practice — practical, original explainers with examples.