🌡️ Temperature
Convert temperature between Celsius, Fahrenheit and Kelvin free. Instant accurate conversion for cooking, weather and science.
🌡️ Temperature
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About the Temperature Tool
Temperature is unusual among conversions because the scales have different zero points, not just different unit sizes. That means you cannot simply multiply — Fahrenheit to Celsius requires subtracting 32 before scaling, which is why mental conversion trips people up.
This converter handles Celsius, Fahrenheit, and Kelvin exactly. Celsius and Fahrenheit are everyday scales; Kelvin is the scientific standard, starting at absolute zero, the point where molecular motion theoretically stops. Conversion is instant and runs in your browser.
How to Use Temperature
- Enter the temperature value.
- Select the scale you are converting from.
- Select the target scale.
- The converted temperature appears immediately.
When to Use This Tool
- Converting oven temperatures in recipes from other countries
- Understanding weather forecasts quoted in an unfamiliar scale
- Converting scientific measurements to or from Kelvin
- Checking equipment operating ranges given in different units
- Interpreting body temperature readings across scales
Things Worth Knowing
- Water freezes at 0°C, 32°F, and 273.15 K, and boils at 100°C, 212°F, and 373.15 K at standard pressure.
- Absolute zero is 0 K, which is −273.15°C or −459.67°F.
- Kelvin is written without a degree symbol — 300 K, not 300°K.
Quick Facts
| Tool name | Temperature |
| Category | Unit Converters |
| Price | Free — no account, no trial, no watermark |
| Where it runs | Entirely in your browser (client-side) |
| Files uploaded | None — your data never leaves your device |
| File size limit | None imposed; limited only by device memory |
| Works offline | Yes, once the page has loaded |
| Platforms | Windows, macOS, Linux, Android, iOS |
Frequently Asked Questions
What is the formula for Fahrenheit to Celsius?
Subtract 32, then multiply by 5/9. So 98.6°F becomes (98.6 − 32) × 5/9 = 37°C. Reverse it for the other direction: multiply by 9/5, then add 32.
Is there a quick mental approximation?
For Fahrenheit to Celsius, subtract 30 and halve. 70°F gives roughly 20°C, against an actual 21.1°C — close enough for weather.
At what temperature do Celsius and Fahrenheit meet?
At −40 degrees. It is the single point where both scales give the same number, which makes −40°C and −40°F identical.
Why does science use Kelvin?
Because it starts at absolute zero with no negative values, which makes physical equations involving temperature far simpler. A Kelvin degree is the same size as a Celsius degree, so only the offset differs.