# Kelvin to Degrees Celsius (K to °C)

> Convert kelvin to degrees Celsius with the formula °C = K − 273.15. Conversion table and worked examples, with JSON API and MCP access.

- Page id: `kelvin-to-celsius` · Quantity: Temperature (`temperature`, base unit K) · Tool: `convert_units`
- Canonical page: https://tttkmbb.com/conversion/kelvin-to-celsius · This document: https://tttkmbb.com/conversion/kelvin-to-celsius.md · JSON: https://tttkmbb.com/conversion/kelvin-to-celsius.json (add `?value=` for a result)

## Formula

- `°C = K − 273.15`
- `°C = K − 273.15`
- Reverse: `K = °C + 273.15`

Non-linear conversion: apply the formula directly; there is no single multiplication factor.

## Worked examples

- 300 K = 26.85 °C
- 273.15 K = 0 °C
- 0 K = -273.15 °C

## Conversion table

| Kelvin (K) | Degrees Celsius (°C) |
| --- | --- |
| 0 | -273.15 |
| 50 | -223.15 |
| 100 | -173.15 |
| 150 | -123.15 |
| 200 | -73.15 |
| 250 | -23.15 |
| 273.15 | 0 |
| 293.15 | 20 |
| 300 | 26.85 |
| 310 | 36.85 |
| 350 | 76.85 |
| 373.15 | 100 |
| 400 | 126.85 |
| 500 | 226.85 |
| 600 | 326.85 |
| 800 | 526.85 |
| 1000 | 726.85 |
| 1500 | 1226.85 |
| 2000 | 1726.85 |
| 5000 | 4726.85 |

## API

- `GET https://tttkmbb.com/api/v1/convert?value=300&from_unit=K&to_unit=C` → unified JSON envelope with `result.values.result`, `formula`, `factor`, `sources`, `freshness`
- MCP: server `https://tttkmbb.com/mcp`, tool `convert_units` with `{"value":300,"from_unit":"K","to_unit":"C"}`
- All temperature units: https://tttkmbb.com/api/v1/units?quantity=temperature · full converter: [Temperature Converter](https://tttkmbb.com/conversion/temperature.md)
- Authentication: none. Freshness: `static` (fixed conversion factors).

## FAQ

**What is the formula to convert kelvin to degrees Celsius?**

°C = K − 273.15. For example, 300 K = 26.85 °C.

**How do I convert degrees Celsius back to kelvin?**

K = °C + 273.15; the degrees Celsius-to-kelvin page applies it directly.

**Why is there no single multiplication factor?**

Temperature scales have different zero points, so the conversion is an affine formula (scale and offset), not a plain multiplication.

## Related conversions

- [Degrees Celsius to kelvin](https://tttkmbb.com/conversion/celsius-to-kelvin.md) (reverse)
- [Degrees Celsius to Degrees Fahrenheit](https://tttkmbb.com/conversion/celsius-to-fahrenheit.md)
- [Degrees Fahrenheit to Degrees Celsius](https://tttkmbb.com/conversion/fahrenheit-to-celsius.md)
- [Degrees Fahrenheit to Kelvin](https://tttkmbb.com/conversion/fahrenheit-to-kelvin.md)
- [Kelvin to Degrees Fahrenheit](https://tttkmbb.com/conversion/kelvin-to-fahrenheit.md)
- [Degrees Fahrenheit to Degrees Rankine](https://tttkmbb.com/conversion/fahrenheit-to-rankine.md)
- [Degrees Rankine to Degrees Fahrenheit](https://tttkmbb.com/conversion/rankine-to-fahrenheit.md)
- [Kelvin to Degrees Rankine](https://tttkmbb.com/conversion/kelvin-to-rankine.md)
- [Degrees Rankine to Kelvin](https://tttkmbb.com/conversion/rankine-to-kelvin.md)

## Data Sources

- NIST Special Publication 811 – Guide for the Use of the International System of Units (SI), Appendix B conversion factors — https://www.nist.gov/pml/special-publication-811 (standard, retrieved 2026-09-24)
- BIPM – The International System of Units (SI Brochure, 9th edition) — https://www.bipm.org/en/publications/si-brochure (standard, retrieved 2026-09-24)
- Wikipedia – Conversion of units — https://en.wikipedia.org/wiki/Conversion_of_units (reference, retrieved 2026-09-24)