Three scales: Celsius (°C, used almost everywhere), Fahrenheit (°F, mostly the US), and Kelvin (K, science). They measure the same thing, just from different starting points.
Type a value, pick units
68
20 °C = 68 °F
Three scales, same heat
- Celsius (°C) — water freezes at 0°, boils at 100°. Used almost everywhere.
- Fahrenheit (°F) — water freezes at 32°, boils at 212°. Mainly the US.
- Kelvin (K) — starts at absolute zero (−273.15 °C). Used in science; no negatives.
- 20 °C ≈ 68 °F — a comfortable room.
°C to °F
Your turn
Body temperature is about 37 °C. What's that in °F?
The Celsius and Fahrenheit scales cross at exactly −40°: −40 °C = −40 °F.
C to F
F to C
C to K
Try it
100 °C in °F?
100 × 9/5 + 32 = 180 + 32 = 212 °F. (Boiling water.)
Try it
−40 °C in °F?
−40 × 9/5 + 32 = −72 + 32 = −40 °F. The two scales meet at −40°.