How to convert Celsius to Kelvin
Celsius and Kelvin are related by a formula rather than a single factor. Temperature conversions are needed for weather, cooking, science and travel. Temperature scales have different zero points, so conversions use offsets as well as ratios.
Celsius to Kelvin conversion table
| Celsius (°C) | Kelvin (K) |
|---|---|
| -40 °C | 233.15 K |
| -20 °C | 253.15 K |
| -10 °C | 263.15 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 |
| 40 °C | 313.15 K |
| 50 °C | 323.15 K |
| 100 °C | 373.15 K |
About the units
Celsius (°C)
Celsius sets water freezing at 0 °C and boiling at 100 °C at sea level.
Kelvin (K)
Kelvin is the SI temperature scale starting at absolute zero; 0 K = −273.15 °C.
How to use this converter
- Type the number of Celsius (°C) in the input box.
- The result in Kelvin appears instantly — no button needed.
- See the same value in every other temperature unit just below.
- Use “Swap units” to convert Kelvin back to Celsius.
When you’ll use the celsius to kelvin conversion
Converting celsius to kelvin comes up more often than you might expect — for example when reading a weather forecast while traveling, setting an oven or thermostat, or baking with a recipe from another country. Type your number once and you get the exact answer plus every related unit, so you don’t need to convert twice.
Watch out for these mix-ups
- Temperature scales have different zero points, so you cannot just multiply.
- A change of 1 °C equals a change of 1.8 °F — but 1 °C is not 1.8 °F.
Tips for better results
- Double-check which system a unit belongs to (for example US vs UK gallons).
- Use the swap button to convert in the opposite direction instantly.
- Bookmark the conversions you use most — each pair has its own page.
Frequently asked questions
How many Kelvin are in one celsius?
274.15 K corresponds to 1 °C. Because this scale uses an offset or an inverse relationship, there is no single multiplication factor — use the formula above.
How do I convert Celsius to Kelvin?
Apply the formula shown on this page, or enter your value in the converter for an instant exact answer.
What is 37 °C in K?
37 °C = 310.15 K. Also, 0 °C = 273.15 K and 100 °C = 373.15 K.
What is the difference between a celsius and a kelvin?
Celsius sets water freezing at 0 °C and boiling at 100 °C at sea level. Kelvin is the SI temperature scale starting at absolute zero; 0 K = −273.15 °C.
Is this tool free and private?
Yes — the Celsius to Kelvin is completely free with no sign-up, and it runs entirely in your browser, so the values you enter are never uploaded to our servers.
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