---
title: "18 °C to K = 291.15 K"
description: "18 degrees Celsius is 291.15 kelvin. The arithmetic, a table of nearby values, and a converter for any other number."
url: https://atoneplace.net/convert/18-celsius-to-kelvin/
site: "At One Place"
---

# 18 °C to K

**18 degrees Celsius in kelvin: 18 °C = 291.15 K**

K = °C + 273.15

18 degrees Celsius is 291.15 kelvin. To get there, use K = °C + 273.15.

## Values either side

*Degrees Celsius near 18, converted to kelvin.*

| Degrees Celsius | Kelvin |
| --- | --- |
| 14 °C | 287.15 |
| 15 °C | 288.15 |
| 16 °C | 289.15 |
| 17 °C | 290.15 |
| 18 °C ← | 291.15 |
| 19 °C | 292.15 |
| 20 °C | 293.15 |
| 21 °C | 294.15 |
| 22 °C | 295.15 |

## How the conversion works

The relationship is K = °C + 273.15. Both units measure temperature, so the conversion is a fixed formula that never changes. Temperature scales are the one common case where converting is not just multiplication — Celsius and Fahrenheit each put their zero in a different place, so an offset is applied as well as a scale factor.

## Common questions

### What is 18 °C in kelvin?

18 °C is 291.15 K.

### How do you convert degrees Celsius to kelvin?

Use K = °C + 273.15.

## Related pages

- [Degrees Celsius to kelvin](https://atoneplace.net/convert/celsius-to-kelvin/)
- [18 K to °C](https://atoneplace.net/convert/18-kelvin-to-celsius/)
- [14 °C to K](https://atoneplace.net/convert/14-celsius-to-kelvin/)
- [15 °C to K](https://atoneplace.net/convert/15-celsius-to-kelvin/)
- [16 °C to K](https://atoneplace.net/convert/16-celsius-to-kelvin/)
- [17 °C to K](https://atoneplace.net/convert/17-celsius-to-kelvin/)
- [19 °C to K](https://atoneplace.net/convert/19-celsius-to-kelvin/)
- [20 °C to K](https://atoneplace.net/convert/20-celsius-to-kelvin/)
- [21 °C to K](https://atoneplace.net/convert/21-celsius-to-kelvin/)
- [22 °C to K](https://atoneplace.net/convert/22-celsius-to-kelvin/)

## Sources

- Guide for the Use of the International System of Units (SP 811) — NIST (https://www.nist.gov/pml/special-publication-811) [Public domain (US Government)]
- The International System of Units (SI Brochure) — Bureau International des Poids et Mesures (https://www.bipm.org/en/publications/si-brochure)
- Calculated on this page — At One Place (/about/)