Temperature conversion

Kelvin to Celsius conversion

Convert Kelvin (K) to Celsius (°C). Exact formula °C = K − 273.15, absolute zero & freeze/boil examples, chart, FAQ. Runs locally in your browser.

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Formulas

Core equations used by this converter.

K → °C°C = K − 273.15

Exact anchors273.15 K = 0 °C

°C → KK = °C + 273.15

iTemperature conversions are affine (scale + offset), not a single multiply. Absolute zero is 0 K = −273.15 °C = −459.67 °F = 0 °R.

How to use

Choose K → °C or °C → K

Use the tabs to switch direction. Forward mode needs kelvin; reverse uses the opposite unit.

Enter the temperature

Type a signed value in the active unit field.

Convert and read the result

Use Convert or let the result update automatically.

Example conversions

Common values with formula and result.

273.15 K to Celsius (water freezes)

273.15 − 273.15 = 0 °C

0 °C

293.15 K to Celsius

293.15 − 273.15 = 20 °C

20 °C

373.15 K to Celsius (water boils at 1 atm)

373.15 − 273.15 = 100 °C

100 °C

0 K to Celsius (absolute zero)

0 − 273.15 = −273.15 °C

−273.15 °C

Kelvin to Celsius conversion specification

Version 1.1.0 · Engine tested

Calculation status

Engine tested 4 published cases
Named expert review Not performed
Calculation version 1.1.0

Review policy

Definition: Kelvin (K) converts to °C using an affine temperature relation. Convert Kelvin (K) to Celsius (°C). Exact formula °C = K − 273.15, absolute zero & freeze/boil examples, chart, FAQ.
What it calculates: Temperature between K and °C. Switch direction with the converter tabs.
Inputs: Kelvin (K) or reverse unit (°C)
Outputs: Converted value in °C or K
Formula: °C = K − 273.15 · K = °C + 273.15
Kelvin to Celsius conversion table: Kelvin (K) Celsius (°C) Notes
0 K −273.15 °C Absolute zero
233.15 K −40 °C
273.15 K 0 °C Water freezes
283.15 K 10 °C
293.15 K 20 °C Room temperature
298.15 K 25 °C
310.15 K 37 °C Body temperature
373.15 K 100 °C Water boils (1 atm)
Assumptions: Conversion runs locally in the browser; values are not uploaded.
Uses the standard factor/definition for these units.
Units: K → °C
°C → K
Boundary conditions: Empty or non-numeric input yields no valid result.
Negative temperatures are allowed.
Example: 273.15 K → 0 °C
Validation cases: 273.15 K → 0 °C
293.15 K → 20 °C
310.15 K → 37 °C
373.15 K → 100 °C
Sources: ITS-90 / SI temperature scale definitions (°C, K)
Fahrenheit defined relative to Celsius: °F = °C × 9/5 + 32
Calculation version: 1.1.0

Kelvin (K)	Celsius (°C)	Notes
0 K	−273.15 °C	Absolute zero
233.15 K	−40 °C
273.15 K	0 °C	Water freezes
283.15 K	10 °C
293.15 K	20 °C	Room temperature
298.15 K	25 °C
310.15 K	37 °C	Body temperature
373.15 K	100 °C	Water boils (1 atm)

Background

Interpretation and common distinctions.

Use the converter tabs to switch direction when available. Results for Kelvin to Celsius conversion update locally in your browser.

Frequently asked questions

Key distinctions behind the conversion.

How do you convert using Kelvin to Celsius conversion?

Use °C = K × 1 + -273.15. Example: 273.15 K to Celsius (water freezes) → 0 °C.

Can I switch direction?

Use the converter tabs when available, or open the related reverse tool from Related.

Does this run online or locally?

Calculation runs locally in your browser. Values are not uploaded.

How precise are the results?

Results follow the formulas on this page. Round to the precision your use case needs.