Temperature Converter
Convert between Celsius, Fahrenheit, Kelvin, Rankine and Réaumur. Affine (non-linear) conversion formulas applied — 0 °C = 32 °F = 273.15 K reference points always correct.
What powers the Temperature Converter
5 scales: Celsius, Fahrenheit, Kelvin, Rankine, Réaumur
Affine formula (handles offset correctly, not just multiplier)
All scales convert simultaneously
Reference points always shown
Works for negative and absolute-zero values
instant
Why the Temperature Converter is different
Browser-native
The Temperature Converter runs entirely in your browser. Input is processed locally — never uploaded, never logged, never cached anywhere outside your device.
No artificial limits
No daily quotas, no character ceilings, no "upgrade for more" walls. Every feature is the complete feature — the same on the first use as the thousandth.
Production-grade quality
Built to the same engineering bar as paid SaaS tools — accurate algorithms, audited logic, responsive design and accessibility-tested interactions.
Common use contexts
- Cooking — recipes from different regions (°F vs °C)
- Weather — US uses °F, rest of world uses °C
- Science — Kelvin for absolute scale work
- Engineering — Rankine in US thermodynamics
Private and secure
Zero upload
All processing happens in your browser. Input is never transmitted, logged or cached.
Works offline
Once the page loads, the tool runs without an internet connection. No network calls happen during use.
No tracking
No accounts, no cookies for tool state. Only aggregate analytics count visits at the page level.