Temperature Converter

Reference

What are the temperature scales?

Temperature measures the average kinetic energy of particles in a substance. The three main scales are: Celsius (°C) — used worldwide for everyday temperatures, based on water's freezing (0°C) and boiling (100°C) points. Fahrenheit (°F) — used in the United States and a few other countries, with water freezing at 32°F and boiling at 212°F. Kelvin (K) — the SI unit for scientific measurement, starting at absolute zero (the theoretical minimum where all molecular motion stops). Kelvin uses the same degree size as Celsius, just offset by 273.15.

Temperature conversion formulas

°C → °F: °F = (°C × 9/5) + 32. Quick trick: double the Celsius, then add 30 for a rough estimate.
°F → °C: °C = (°F − 32) × 5/9. Quick trick: subtract 30, then halve it.
°C → K: K = °C + 273.15. Room temperature (20°C) = 293.15 K.
K → °C: °C = K − 273.15.
°F → K: Convert to Celsius first, then add 273.15.

Key reference temperatures

Absolute zero: −273.15°C / −459.67°F / 0 K — the lowest possible temperature.
Water freezes: 0°C / 32°F / 273.15 K (at sea level).
Room temperature: 20–22°C / 68–72°F / 293–295 K.
Body temperature: 37°C / 98.6°F / 310.15 K.
Water boils: 100°C / 212°F / 373.15 K (at sea level).
−40°: The only point where Celsius and Fahrenheit are equal (−40°C = −40°F).

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