# Kelvin to Degrees Rankine (K to °R)

> Convert kelvin to degrees Rankine with the formula °R = K × 9/5. Conversion table and worked examples, with JSON API and MCP access.

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

## Formula

- `°R = K × 9/5`
- `°R = K × 9/5`
- Reverse: `K = °R × 5/9`

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

## Worked examples

- 300 K = 540 °R
- 273.15 K = 491.67 °R
- 0 K = 0 °R

## Conversion table

| Kelvin (K) | Degrees Rankine (°R) |
| --- | --- |
| 0 | 0 |
| 50 | 90 |
| 100 | 180 |
| 150 | 270 |
| 200 | 360 |
| 250 | 450 |
| 273.15 | 491.67 |
| 293.15 | 527.67 |
| 300 | 540 |
| 310 | 558 |
| 350 | 630 |
| 373.15 | 671.67 |
| 400 | 720 |
| 500 | 900 |
| 600 | 1080 |
| 800 | 1440 |
| 1000 | 1800 |
| 1500 | 2700 |
| 2000 | 3600 |
| 5000 | 9000 |

## API

- `GET https://tttkmbb.com/api/v1/convert?value=300&from_unit=K&to_unit=R` → 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":"R"}`
- 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 Rankine?**

°R = K × 9/5. For example, 300 K = 540 °R.

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

K = °R × 5/9; the degrees Rankine-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 Rankine to kelvin](https://tttkmbb.com/conversion/rankine-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 Celsius to Kelvin](https://tttkmbb.com/conversion/celsius-to-kelvin.md)
- [Kelvin to Degrees Celsius](https://tttkmbb.com/conversion/kelvin-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)

## 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)