Temperature Converter

Convert between all 8 temperature scales instantly, with real-world context, formulas and colour temperature.

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Human Feeling

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💧

Water Phase

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📌

Nearest Reference

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💡

Blackbody Colour

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Conversion Formulas
°C → °F°F = °C × 9/5 + 32
°F → °C°C = (°F − 32) × 5/9
°C → KK = °C + 273.15
°C → °Ra°Ra = (°C + 273.15) × 9/5
°C → °De°De = (100 − °C) × 3/2
°C → °N°N = °C × 33/100
°C → °Ré°Ré = °C × 4/5
°C → °Rø°Rø = °C × 21/40 + 7.5
Reference Temperature Table
Reference Point°C°FK

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How to use

  1. Type any number into one of the eight scale boxes (Celsius, Fahrenheit, Kelvin, Rankine, Delisle, Newton, Reaumur, Romer).
  2. All other scales update live as you type.
  3. Watch the 3D thermometer and the context cards (feels like, phase, reference, blackbody colour) update.
  4. Tap the copy icon next to any value to copy it to the clipboard.
  5. Open Quick Reference to jump to common temperatures like body heat, freezing, boiling.

Frequently asked questions

How do I convert Celsius to Fahrenheit?

Multiply by 9/5 and add 32. For example, 20 C becomes 68 F. The tool does this for you instantly across all eight scales.

What is Kelvin used for?

Kelvin is the SI base unit of temperature. It starts at absolute zero (no thermal motion) and is used in physics, chemistry, and astronomy. 0 K is -273.15 C.

Why are there eight different temperature scales?

Before the SI system, different scientists in different regions defined their own scales. Celsius, Fahrenheit, and Kelvin are still in everyday use. Rankine, Delisle, Newton, Reaumur, and Romer are mostly historical but still appear in older texts and specialised fields.

Is my data sent anywhere?

No. Every conversion runs locally in your browser. Nothing is uploaded, stored on a server, or logged.