Convert degrees Celsius to kelvins

1 °C=274.15K

Use the converter below to change any degrees Celsius value into kelvins instantly — with formula, conversion table, and real-world examples.

You have

Equals

274.15

Conversion formula

Forward

K = °C + 273.15

Reverse

°C = K − 273.15

These temperature formulas are exact — no approximation involved.

About both units

From

Celsius

°C

The Celsius scale defines 0 °C as the freezing point of water and 100 °C as the boiling point at standard atmospheric pressure. Proposed by Anders Celsius in 1742, it is the everyday temperature unit in all countries except the US, Belize, the Bahamas, the Cayman Islands and Liberia.

Real-world: Room temperature is about 20 °C. Normal body temperature is 37 °C. Typical fridge setting is 4 °C. European winter can reach −20 °C; desert summer 45+ °C.

Read full celsius reference →

Kelvin

The kelvin is the SI base unit of thermodynamic temperature. Its zero point is absolute zero — the theoretical coldest possible temperature. Water freezes at 273.15 K and boils at 373.15 K. Note: there is no "degree" symbol with kelvin, only "K".

Real-world: Room temperature ≈ 293 K. Water boils at 373 K. The Sun's surface is 5778 K. Deep space is about 2.7 K.

Read full kelvin reference →

Celsius to Kelvin conversion table

Common degrees Celsius to kelvins values for quick reference.

Celsius (°C)	Kelvin (K)
-40 °C	233.15 K
-20 °C	253.15 K
0 °C	273.15 K
10 °C	283.15 K
20 °C	293.15 K
25 °C	298.15 K
30 °C	303.15 K
37 °C	310.15 K
100 °C	373.15 K
200 °C	473.15 K

Tips & common mistakes

Quick tips

0 °C = freezing; 100 °C = boiling. Easy anchor points.
Mental F conversion: double the °C and add 30 (rough). 20 °C → 70 °F (actual 68).
Medical thermometers show 0.1 °C resolution — a rise from 37.0 to 37.5 matters.

Avoid these

Using "degrees centigrade" — the scale was renamed Celsius in 1948.
Assuming a linear relationship between °C and °F without the +32 offset.
Interpreting UK winter forecasts in °F by habit — UK uses °C.

Frequently asked questions

How many kelvins in a celsius?

One celsius equals 274.15 kelvins.

How do I convert degrees Celsius to kelvins?

Temperature conversion is non-linear. From Celsius to Kelvin use the specific formula — this tool applies it automatically.

What is 100 degrees Celsius in kelvins?

100 degrees Celsius equals 373.15 kelvins.

Is a celsius bigger than a kelvin?

Temperature units compare by scale, not by size of one degree. Celsius and Kelvin use different zero points.

How to convert degrees Celsius to kelvins without a calculator?

Use the mental shortcut relevant to these temperature scales — but for accuracy always verify with a calculator.

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