Temperature Converter and Visualizer

What's great about our Temperature Converter and Visualizer

For both kids and professionals to visualize temperatures

• Free

• Converts Celsius, Fahrenheit, Kelvin and Rankine instantly

• No sign-up

• No ads

• Works offline once loaded

• No daily limit

Choose which units to show

Use the Celsius, Fahrenheit, Kelvin and Rankine checkboxes at the top to show or hide each card.

Drag a slider or type a value

Move any slider, or type a number into its "Type Value" box, and every visible unit updates instantly.

Switch to higher temperatures

Turn on "Higher Temps" to widen every slider's range for extreme values.

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About Celsius (°C)

Celsius is the temperature scale used by most of the world for everyday things like weather, cooking and school science. It was proposed in 1742 by Swedish astronomer Anders Celsius, and it's built around water: 0°C is where water freezes, and 100°C is where it boils, both measured at normal air pressure.

• Part of the metric system, so it's the default scale almost everywhere except the United States

• Easy to convert to Kelvin: just add 273.15 (0°C = 273.15K)

• To convert to Fahrenheit: multiply by 9/5, then add 32

• Common reference points: 20°C is a mild room temperature, 37°C is normal human body temperature

About Fahrenheit (°F)

Fahrenheit is the temperature scale used mainly in the United States, along with a few other countries and territories. It was created in 1724 by physicist Daniel Gabriel Fahrenheit, who based his scale on a mix of brine's freezing point and average human body temperature. On this scale, water freezes at 32°F and boils at 212°F.

• Used day-to-day for weather forecasts and cooking in the US

• Has a 180-degree gap between freezing and boiling, giving finer detail for everyday temperature changes

• To convert to Celsius: subtract 32, then multiply by 5/9

• Common reference points: 68°F is a comfortable room temperature, 98.6°F is normal human body temperature

About Kelvin (K)

Kelvin is the official SI (scientific) unit of temperature, used by scientists and engineers worldwide in fields like physics, chemistry and astronomy. It's named after Lord Kelvin (William Thomson), and unlike Celsius or Fahrenheit, it has no negative numbers — it starts at absolute zero, the coldest temperature theoretically possible, where molecules stop moving entirely.

• Absolute zero is 0K, equal to −273.15°C — nothing can be colder

• Kelvin doesn't use a degree symbol; it's written as "300K", not "300°K"

• Each Kelvin step is the same size as a Celsius step, so K = °C + 273.15

• Water freezes at 273.15K and boils at 373.15K

About Rankine (°R)

Rankine is an absolute temperature scale mainly used in US engineering fields such as aerospace and thermodynamics. It was named after Scottish engineer William John Macquorn Rankine. Like Kelvin, it starts at absolute zero with no negative values, but its degree size matches Fahrenheit rather than Celsius, which makes it convenient for engineers already working in Fahrenheit.

• Absolute zero is 0°R, exactly equal to 0K and −273.15°C

• Each Rankine degree is the same size as a Fahrenheit degree, so °R = °F + 459.67

• Mostly used in specialized engineering and thermodynamics work, rarely in everyday life

• Water freezes at 491.67°R and boils at 671.67°R