# Temperature Converter

> Temperature converter converts between Celsius, Fahrenheit, Kelvin, and Rankine instantly with a reference table. Free, private, runs in your browser, no signup.

- **Canonical URL:** https://boringtoolskit.com/temperature-converter/
- **Category:** Converters
- **Evidence level:** authored-methodology
- **Reviewed:** 2026-09-20
- **Last verified:** 2026-10-12
- **Privacy:** Inputs and results stay in this browser unless the page clearly labels an external request.

## How it works

K = °C + 273.15; °F = °C × 9/5 + 32 (convert using exact formulas)

## Assumptions

- Inputs are treated as exact decimal values.
- Standard (not historical or survey) unit definitions are used.
- The calculation uses the factors at the precision shown in the formula panel; rounding beyond that is display-only and adds no accuracy.

## Common questions

### Why convert through celsius instead of directly?

Routing every unit through a single base (celsius) means each unit needs only one exact factor against the standard, and any pair combines cleanly. Direct pair factors drift apart over time in hand-maintained tables; a base-unit graph cannot.

### How precise is the converted temperature?

The conversion applies the standard factors shown in the formula panel. The practical limit is your input: a thermometer is usually specified to about 0.5-1 degree, so extra digits beyond what you actually read do not add accuracy.

## Sources

- [SI Brochure, 9th edition, thermodynamic temperature](https://www.bipm.org/en/publications/si-brochure)

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