Kelvin to Celsius Converter
Convert Kelvin to Celsius for physics, chemistry, astronomy and engineering. Simply subtract 273.15 — the formula and a reference table for common values.
Last updated: May 2026
Why this conversion matters
Scientific sources often publish temperatures in Kelvin while daily life uses Celsius.
A direct page like this saves time when you need to sense-check a value instead of digging through a formula every time.
Typical use cases
- interpreting lab data
- sensor readings
- school assignments
- technical documentation
Quick reference
| K | °C |
|---|---|
| 273.15 | 0 |
| 298.15 | 25 |
| 373.15 | 100 |
| 233.15 | -40 |
Related tools and sections
Frequently Asked Questions
Why do scientists use Kelvin instead of Celsius?
Kelvin is an absolute temperature scale — it starts at absolute zero (0 K), the lowest possible temperature. This makes Kelvin ideal for physics equations that involve ratios or proportional relationships. In Celsius, ratios don't work correctly because it's relative (0°C is arbitrary; water just freezes there).
What does a temperature in Kelvin tell me?
Kelvin directly represents thermal energy. A object at 300 K has precisely twice the absolute thermal energy of one at 150 K. This relationship is why Kelvin appears in gas laws, radiation formulas, and thermodynamics — the math only works with absolute temperature.
Can I use this converter for everyday temperature?
Technically yes, but it's uncommon. Celsius is standard for weather, cooking, and daily life. You'll convert to Kelvin only when reading scientific papers, lab data, sensor specifications, or doing physics calculations. Stick with Celsius for anything else.