Kelvin to Celsius Converter
Convert Kelvin to Celsius for science, engineering, and physics temperature reference.
How It Works
Formula: K to °C = value × 1 − 273.15
Example: 300 K = 26.85 °C
Note: Kelvin converts to Celsius using C = K − 273.15, the SI temperature standard used in science.
Common Uses
Quick Conversion Table
| K | °C |
|---|---|
| -40 | -313.15 |
| 0 | -273.15 |
| 20 | -253.15 |
| 25 | -248.15 |
| 37 | -236.15 |
| 100 | -173.15 |
| 200 | -73.15 |
Rounding Rule
Rounded to 2 decimal places
Error Margin
±0.01°C
Precision Guidance
For science, keep 2 decimal places. For estimates, round to 1 decimal.
Common Mistakes
Kelvin does not use the degree symbol (°). Write 300 K, not 300°K. Subtract 273.15, not 273, for precision.
Frequently Asked Questions
What is 300 K in Celsius?
300 K equals 26.85°C using the formula C = K − 273.15.
How do I convert Kelvin to Celsius?
Subtract 273.15 from the Kelvin value. For example, 300 K − 273.15 = 26.85°C.
What is 0 Kelvin?
0 K is absolute zero, equal to −273.15°C, the lowest possible temperature.
Is Kelvin used in everyday life?
No, Kelvin is mainly used in science and engineering. Celsius and Fahrenheit are for everyday temperatures.
Deep Dive Guide
Kelvin to Celsius: Scientific Temperature Conversion for US Students and Engineers
Convert Kelvin to Celsius for science, engineering, and physics. Learn why Kelvin matters for absolute zero calculations and thermodynamic equations.
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Exact Constants & Authoritative Sources
Every conversion on this page uses the fixed, internationally agreed constants below — drawn from NIST and the SI Brochure. No values are estimated or rounded as if exact. See the full list on our Sources & Standards page.
- EXACT°F = °C × 9/5 + 32 (exact linear relation)
- EXACT°C = (°F − 32) × 5/9 (exact inverse relation)
- EXACTKelvin (K) = °C + 273.15 (exact offset)
- EXACTWater freezes at 0 °C = 32 °F and boils at 100 °C = 212 °F
Common Pitfalls & How to Avoid Them
Subtract 32 BEFORE multiplying
°C = (°F − 32) × 5/9. Doing 5/9 × °F − 32 instead gives a wrong answer because the offset must be removed first. Parentheses matter.
Degrees are not the same size
A 1 °C step equals a 1.8 °F step. A "10-degree" forecast difference is 18 °F, not 10 °F. This is why a 5 °C day feels very different from a 15 °C day.
Negative signs
Below freezing, (°F − 32) is negative; keep the sign through the whole calculation. −40 °C = −40 °F is the only point where the two scales meet.
A unit-conversion reference site has no manufacturer-specific or device calibration parameters, so "layered tuning" does not apply here. The only real error-handling is input validation: the converter rejects non-numeric, empty, or out-of-range entries and shows a clear message, then falls back to exact constants above. No estimated or rounded figures are ever presented as exact.
Authoritative sources for this page
- NIST (U.S. National Institute of Standards and Technology) — NIST — SI Units: Temperature
Last Updated 2026 | This converter was reviewed for accuracy