Temperature Converter

Convert between Celsius (°C), Fahrenheit (°F) and Kelvin (K) instantly.

Instant result Runs in browser

Tip: Enter a value in any field and the others update automatically.

Quick reference

°C°FK
−273.15−459.670Absolute zero
032273.15Freezing point of water
2068293.15Room temperature
3798.6310.15Body temperature
100212373.15Boiling point of water

Formulas

°F = °C × 9/5 + 32
°C = (°F − 32) × 5/9
K = °C + 273.15

How to use?

  1. 1
    Enter a value Type a value into the Celsius, Fahrenheit, or Kelvin field.
  2. 2
    Auto conversion Other units update instantly. Alternatively, click Calculate to refresh.
  3. 3
    Copy or print Use the Copy button to copy all three values to clipboard.

FAQ

How do you convert Celsius to Fahrenheit?
Use °F = °C × 9/5 + 32. Example: 20°C → 20 × 9/5 + 32 = 68°F
Why can't Kelvin be negative?
Kelvin starts at absolute zero (−273.15°C). Going below this is physically impossible.
Which unit is more accurate?
All units are equally accurate — they just use different scales. Science prefers Kelvin; daily life uses Celsius or Fahrenheit.

What Are Temperature Units?

Three main units are used worldwide: Celsius (°C), Fahrenheit (°F), and Kelvin (K).

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