1 Degree to Kelvin – Full Calculation Guide

1 degree Celsius is equal to 274.15 kelvin.

The conversion from degree Celsius to kelvin involves adding 273.15 to the Celsius temperature. This is because the kelvin scale starts at absolute zero, which is -273.15 degrees Celsius, making the kelvin scale shifted upwards by this value.

Conversion Tool

Conversion Formula

To convert degrees Celsius to kelvin, you must add 273.15 to the Celsius temperature. The formula is:

K = °C + 273.15

This works because the kelvin scale is an absolute temperature scale starting at absolute zero, which is the lowest possible temperature and equals -273.15°C. By adding 273.15 to any Celsius temperature, you shift the scale so that 0 kelvin represents absolute zero.

Example Calculation:

• Given 1°C, add 273.15.
• 1 + 273.15 = 274.15 K.
• Therefore, 1°C is 274.15 kelvin.

Conversion Example

• Example 1: Convert 10°C to kelvin
  • Start with 10 degrees Celsius.
  • Add 273.15 to 10: 10 + 273.15 = 283.15
  • Result is 283.15 kelvin.
• Example 2: Convert -5°C to kelvin
  • Starting temperature is -5 degrees Celsius.
  • Add 273.15: -5 + 273.15 = 268.15
  • Final value is 268.15 kelvin.
• Example 3: Convert 25.5°C to kelvin
  • Temperature given is 25.5 degrees Celsius.
  • Add 273.15: 25.5 + 273.15 = 298.65
  • The kelvin value is 298.65.
• Example 4: Convert 0°C to kelvin
  • Zero degrees Celsius is the starting point.
  • Add 273.15: 0 + 273.15 = 273.15
  • So, 0°C equals 273.15 kelvin.

Conversion Chart

You read the chart by matching the Celsius temperature on the left column, then find the corresponding kelvin value on the right column. This lets you quickly convert temperatures without needing calculations each time.

Related Conversion Questions

• What is 1 degree Celsius equal to in kelvin?
• How do I convert 1 degree Celsius to kelvin manually?
• Why does 1 degree Celsius convert to 274.15 kelvin?
• Is 1 degree Celsius above absolute zero in kelvin?
• Can I convert 1 °C to kelvin using a simple formula?
• What kelvin temperature corresponds to 1 degree Celsius?
• How accurate is converting 1 degree Celsius to kelvin?

Conversion Definitions

Degree (°C): A degree Celsius is a unit of temperature measurement based on the Celsius scale, which sets the freezing point of water at 0 degrees and boiling point at 100 degrees under standard atmospheric pressure. It is widely used for daily temperature readings and scientific purposes.

Kelvin (K): Kelvin is the SI base unit for temperature, starting at absolute zero, the lowest possible temperature where particles have minimal motion. It’s used in scientific fields because it measures temperature in an absolute scale without negative numbers, unlike Celsius or Fahrenheit.

Conversion FAQs

Why do I need to add 273.15 to convert Celsius to kelvin?

You add 273.15 because the kelvin scale begins at absolute zero, which is -273.15°C. By adding this number, you shift the Celsius value to the kelvin scale, ensuring no negative temperatures in kelvin and providing a direct measure of thermal energy.

Can kelvin temperatures be negative?

No, kelvin temperatures cannot be negative. The kelvin scale starts at absolute zero (0 K), which means the point where particles have minimum energy. Temperatures below this are physically impossible, so kelvin readings are always zero or positive.

Is converting 1 degree Celsius to kelvin exact or approximate?

The conversion is exact, because the kelvin and Celsius scales have the same incremental size, just shifted by 273.15. So 1°C always equals exactly 274.15 K without rounding errors.

Does the conversion work the same for negative Celsius values?

Yes, the formula adds 273.15 to the Celsius temperature no matter if it’s positive or negative. For example, -10°C converts to 263.15 K. The scale shift stays consistent across all values.

Why is kelvin preferred in scientific measurements over Celsius?

Kelvin is preferred because it is an absolute scale without negative values, making calculations in physics and chemistry simpler and more accurate. It aligns with fundamental physical laws, such as the ideal gas law, that require absolute temperature measurements.

Last Updated : 08 July, 2025

Sandeep Bhandari

Sandeep Bhandari holds a Bachelor of Engineering in Computers from Thapar University (2006). He has 20 years of experience in the technology field. He has a keen interest in various technical fields, including database systems, computer networks, and programming. You can read more about him on his bio page.