§ 01 / TOOL
Temperature Converter.
STATUS READYUNITS 3BASE CELSIUS
> CONVERT
// FROM
=
// TO
212
RESULT.
°C → °F
212 °F.
100 °C = 212 °F
§ 02 / ABOUT
How it works.
Temperature is affine, not linear — there’s a multiplier and an offset. That’s why 0°C ≠ 0°F and you need a real formula instead of a single multiplication.
// THE FORMULAS
- °C → °F: F = C × 9/5 + 32
- °F → °C: C = (F − 32) × 5/9
- °C → K: K = C + 273.15
- K → °C: C = K − 273.15
- °F → K: K = (F − 32) × 5/9 + 273.15
// LANDMARKS
- Absolute zero — 0 K = −273.15°C = −459.67°F
- Freezing point of water — 0°C = 32°F = 273.15 K
- Body temperature — 37°C = 98.6°F = 310.15 K
- Boiling point of water (sea level) — 100°C = 212°F = 373.15 K
- Where °C and °F are equal — −40°C = −40°F. The only point.
// USE IT FOR
- Cooking — recipes from a different country
- Weather — translating forecasts when traveling
- Science — going to/from Kelvin for thermodynamics
- Medical — body temp readings between °F and °C thermometers
§ 03 / FAQ
Common questions.
What’s the formula to convert Celsius to Fahrenheit?+
F = C × 9/5 + 32. Example: 100°C × 9/5 + 32 = 180 + 32 = 212°F (water boils). The reverse: C = (F − 32) × 5/9.
Why isn’t temperature a simple multiply like other units?+
Because the zero points don’t line up. 0°C is the freezing point of water; 0°F is much colder (about −18°C, the freezing point of brine). 0 K is absolute zero (−273.15°C). With offset zero points, you need an "affine" conversion: multiply by a slope, then add an offset. That’s the +32 in F = C × 9/5 + 32.
How do I convert Celsius to Kelvin?+
Just add 273.15. So 0°C = 273.15 K, 100°C = 373.15 K. The Kelvin scale shares the same step size as Celsius (a "1 Kelvin difference" equals a "1°C difference"); only the zero point differs.
What’s a useful Celsius-to-Fahrenheit shortcut?+
Double the Celsius and add 30. It’s within ~5°F across normal everyday temperatures. So 20°C ≈ 70°F (real: 68); 30°C ≈ 90°F (real: 86); 0°C = 32°F (exact, the formula doesn’t apply at the freezing point). Use the actual formula for anything that matters.
§ 04 / TOOLS
Related calculators.
§ 05 / READING