Temperature Converter

How to use

1. 1Type a temperature value into the input. Decimals can use a comma or a period, and a trailing C, F, K, R, or degree symbol is allowed.
2. 2Pick the source scale: Celsius, Fahrenheit, Kelvin, or Rankine. The other three result cards update with the converted value and the exact formula used.
3. 3Choose 0, 1, 2, or 4 decimal places to round results for cooking, weather, or scientific use.
4. 4Tap any common reference point (boiling water, body temperature, oven settings, absolute zero) to load that value and see it in every scale at once.
5. 5Click Copy on any result card to grab that value, or Clear input to start over.

About this tool

Temperature Converter turns any temperature value into Celsius, Fahrenheit, Kelvin, and Rankine at the same time, so you can read every common scale at a glance instead of running formulas in your head. Type a number, pick the source scale (Celsius, Fahrenheit, Kelvin, or Rankine), and the four result cards update instantly with the converted value, the exact formula used for that pair, and a copy button on every result. The conversion path always goes through Celsius internally so the four scales stay perfectly consistent: enter 100 in Celsius and you get 212 °F, 373.15 K, and 671.67 °R; enter 32 °F and you get 0 °C, 273.15 K, and 491.67 °R. The decimal-places control lets you round to 0, 1, 2, or 4 places depending on whether you are setting an oven, reading a thermostat, or doing a physics calculation, and switching the source scale rebases the typed value into the new scale so the displayed reading does not silently change. Inputs accept comma decimal separators, an optional degree symbol, and a trailing C, F, K, or R unit so values pasted from anywhere just work. The tool also flags inputs that fall below absolute zero (which has no physical meaning) and ships a panel of common reference points (water freezing, body temperature, room temperature, oven temperatures, dry ice sublimation, paper auto-ignition, and absolute zero) that you can tap to load instantly. Useful for cooking conversions between American and metric recipes, weather forecasts in a different country, science homework, lab work, HVAC and refrigeration settings, brewing and sous vide, 3D printing nozzle and bed temperatures, and any moment you need to translate a temperature without trusting a fragile mental shortcut. Everything runs in your browser; nothing is uploaded.

Free to use. Works in your browser. No signup, no login.