Celsius to Fahrenheit Converter
Convert celsius to fahrenheit — and back — in an instant. Type a value in either box and the answer updates live. It’s accurate, free and completely private: the conversion runs entirely on your device.
- 🔒 100% private — no uploads
- 🆓 Free, no watermark
- 📱 Works on any device
How to convert
- 1
Choose your units
The tool opens on the most common pairing. Change either unit from its dropdown, or hit the swap button to flip the direction.
- 2
Type a value
Enter a number in either box. The other side updates instantly as you type — convert either way without pressing a button.
- 3
Copy or compare
Copy the result to your clipboard, or scan the common-values table below for quick at-a-glance conversions.
Why use Celsius to Fahrenheit Converter?
100% private
Every conversion is computed locally in your browser. Nothing you enter ever leaves your device.
Instant & two-way
Results update live as you type, in either direction — no “convert” button and no page reloads.
Accurate
Conversions use exact, standards-based factors, so you get the same answer a trusted reference would.
Works on any device
No install and no account — it runs in any modern browser on desktop, tablet or phone.
The Celsius to Fahrenheit formula
To convert Celsius to Fahrenheit, multiply by 9/5 (1.8) and add 32: °F = (°C × 9/5) + 32. For example, 20 °C becomes (20 × 1.8) + 32 = 36 + 32 = 68 °F. For a rough mental estimate, double the Celsius value and add 30 — close enough to judge the weather.
Everyday Celsius temperatures in Fahrenheit
Water freezes at 0 °C (32 °F) and boils at 100 °C (212 °F). Normal body temperature is 37 °C (98.6 °F), a comfortable room is around 21 °C (70 °F), and −40 is the single point where both scales read exactly the same. The reference table below lists more common values at a glance.
Frequently asked questions
How do I convert celsius to fahrenheit?
Type the number of celsius in the first box and read the result in fahrenheit — it updates as you type. To go the other way, type in the fahrenheit box instead.
Does anything get uploaded to a server?
No. The conversion runs entirely in your browser with JavaScript — nothing you type is uploaded, stored or logged, and it keeps working offline once the page has loaded.
Is it free?
Yes — completely free, no account, no watermark and no limits.