About Temperature Converter

Convert C / F / K / Rankine all at once — paste any of them. Part of the DevTools Surf developer suite. Browse more tools in the Calculators collection.

Use Cases

• Engineers converting between Kelvin and Celsius for scientific data
• Travelers converting local weather forecasts between F and C
• HVAC technicians checking temperature readings across unit systems
• Physics students solving thermodynamics problems with mixed units

Tips

• Paste any value in C, F, K, or Rankine to convert all at once
• Absolute zero (0 K) is displayed as a reference point
• Use Kelvin for scientific and engineering calculations

Fun Facts

• The Fahrenheit scale was invented by Daniel Gabriel Fahrenheit in 1724 — he set 0 degrees as the temperature of a brine solution and 96 degrees as human body temperature.
• The Kelvin scale, defined by Lord Kelvin in 1848, starts at absolute zero (-273.15 C) where all molecular motion theoretically ceases.
• The Rankine scale, used in some US engineering fields, is essentially Fahrenheit shifted to absolute zero — 0 Rankine equals 0 Kelvin, or -459.67 degrees Fahrenheit.

FAQ

Which scales?

Celsius, Fahrenheit, Kelvin, Rankine. Paste any value — the other three update simultaneously.

Why Rankine?

Absolute-zero-based like Kelvin but degree-size like Fahrenheit. Used in US engineering (aerospace, thermodynamics). Rare outside that.

What about body temperature?

98.6°F / 37°C is the traditional 'normal'. More recent studies suggest 97.9°F is a better modern average. Individual normal varies ±1°F.

Below absolute zero?

The tool allows input but flags it as unphysical. Absolute zero is 0 K / -273.15°C / -459.67°F / 0 °R. Nothing can be colder.