Temperature Converter — Celsius, Fahrenheit, and Kelvin are three different ways to measure the same thing — temperature. Celsius is used by most of the world and by science. Fahrenheit is used in the US. Kelvin is the SI unit and starts at absolute zero, used in physics and engineering.
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Temperature Converterとは？
Celsius, Fahrenheit, and Kelvin are three different ways to measure the same thing — temperature. Celsius is used by most of the world and by science. Fahrenheit is used in the US. Kelvin is the SI unit and starts at absolute zero, used in physics and engineering.
Type a value in any field and the other two update instantly. No buttons to press, no server round-trips — the math is trivial and runs entirely in your browser.
使い方
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Enter a value
In any of the three fields — Celsius, Fahrenheit, or Kelvin.
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Read the conversion
The other two fields update live.
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Copy or note
The fields are editable, so select and copy whatever you need.
使用例
Boiling point of water
100 °C → 212 °F → 373.15 K
結果： 100 °C = 212 °F = 373.15 K
Absolute zero
The lowest possible temperature — 0 K = -273.15 °C = -459.67 °F.
結果： 0 K = -273.15 °C = -459.67 °F
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Last reviewed: 2026-09-25