Convert Kelvin to Celsius

To convert Kelvin to Celsius, use this simple formula:

• °C = K − 273.15

Subtract 273.15 from the temperature in Kelvin (K) to get degrees Celsius (°C).

Example:

• 300 K − 273.15 = 26.85°C

This Kelvin to Celsius conversion works for any value, including decimals.

What is the Kelvin to Celsius formula?

To convert Kelvin to Celsius, use this formula:
°C = K − 273.15

Kelvin (K) is an absolute temperature scale. Celsius (°C) is based on water’s freezing and boiling points.

How do you convert Kelvin to Celsius step by step?

1. Start with the temperature in Kelvin (K).
2. Subtract 273.15.
3. The result is the temperature in degrees Celsius (°C).

Example: 300 K − 273.15 = 26.85 °C

Why do you subtract 273.15 when converting Kelvin to Celsius?

Kelvin and Celsius use the same size degree. The difference is where each scale starts.

• 0 K is absolute zero.
• 0 °C is the freezing point of water (at standard pressure).

The offset between the two scales is 273.15.

Is 0 Kelvin the same as 0 Celsius?

No.

• 0 K = −273.15 °C
• 0 °C = 273.15 K

Zero Kelvin is the lowest possible temperature. Zero Celsius is a common everyday point on the Celsius scale.

What is absolute zero in Celsius?

Absolute zero is 0 K, which equals:
−273.15 °C

It marks the point where thermal motion is at its lowest limit.

Are Kelvin and Celsius the same size?

Yes. A change of 1 K equals a change of 1 °C.
Only the starting point is different.

Example:

• From 20 °C to 21 °C is a 1-degree change.
• From 293.15 K to 294.15 K is also a 1-degree change.

Do you write “degrees” for Kelvin?

No. Kelvin is written without the word “degrees.”

• Correct: 300 K
• Incorrect: 300°K

Celsius uses the degree symbol: 26.85 °C.

What are common Kelvin to Celsius conversions?

Here are some useful reference points:

• 0 K = −273.15 °C
• 100 K = −173.15 °C
• 200 K = −73.15 °C
• 273.15 K = 0 °C
• 293.15 K = 20 °C
• 300 K = 26.85 °C
• 310.15 K = 37 °C
• 373.15 K = 100 °C

How do you convert Kelvin to Celsius in science and lab work?

Use the same formula: °C = K − 273.15.
Many lab values use Kelvin for gas laws and thermodynamics. Celsius is often used for reporting room and sample temperatures. Converting helps keep results clear and consistent.

What’s the difference between Kelvin and Celsius?

Both scales measure temperature, but they use different zero points.

• Kelvin starts at absolute zero and is common in physics and chemistry.
• Celsius is based on water’s freezing and boiling points and is common in daily use.

Should you round Kelvin to Celsius results?

It depends on your use.

• For everyday use, rounding to one decimal often works.
• For science and engineering, keep two decimals or match your given data.

Example: 298.15 K = 25.00 °C (common in lab settings)

Can Celsius values be negative when converting from Kelvin?

Yes. Any Kelvin value below 273.15 K converts to a negative Celsius value.

Example:
250 K − 273.15 = −23.15 °C