---
title: "Temperature Converter calculator — AperiOptic"
description: "Kelvin, Celsius and Fahrenheit conversions. Free online optics calculator, with the formula and code snippets."
url: "https://aperioptic.com/calculators/temperature-converter"
---

# Temperature Converter calculator

Kelvin, Celsius and Fahrenheit conversions.

Category: [Unit Converters](https://aperioptic.com/calculators)

Formula: `K = °C + 273.15 · °F = °C·9/5 + 32`

## Inputs

| Input | Parameter | Unit | Default |
| --- | --- | --- | --- |
| Temperature | `K` | K | 295 |

## Result with the default inputs

- Kelvin: 295 K
- Celsius: 21.85 °C
- Fahrenheit: 71.33 °F

Open it with your own values: put each input in the address as a parameter, for example [`/calculators/temperature-converter?K=295`](https://aperioptic.com/calculators/temperature-converter?K=295). A unit other than the listed one goes in `<parameter>_unit`.

Read more: [Wikipedia: Conversion of units of temperature](https://en.wikipedia.org/wiki/Conversion_of_units_of_temperature)

[All optics calculators](https://aperioptic.com/calculators)

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The interactive page: https://aperioptic.com/calculators/temperature-converter (AperiOptic runs in the browser; free, no account). Every page of the site as Markdown: https://aperioptic.com/llms.txt