Calculators & Time

Temperature Converter

Type a temperature in any of eight scales and see it converted to all the others instantly.

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Temperature value

Input unit

Fahrenheit (°F)212.0000 °F

Kelvin (K)373.1500 °K

Reference points

Absolute zero-273.15°C / -459.7°F / 0.00K

Water freezes0°C / 32.0°F / 273.15K

Room temperature20°C / 68.0°F / 293.15K

Body temperature37°C / 98.6°F / 310.15K

Water boils100°C / 212.0°F / 373.15K

Fahrenheit's brine reference-17.78°C / -0.0°F / 255.37K

Temperature Scales Explained

Three temperature scales are in common use worldwide: Celsius (metric), Fahrenheit (US customary), and Kelvin (scientific). Each was designed for a different purpose.

Celsius scale

Developed by Anders Celsius in 1742, the Celsius scale is anchored to water's phase transitions: 0°C (freezing) and 100°C (boiling) at standard atmospheric pressure. It is the official temperature unit in the International System of Units (SI) for everyday use in all countries except the United States.

Fahrenheit scale

Created by Daniel Gabriel Fahrenheit in 1724, using a brine solution for 0°F and body temperature for 96°F. The scale was later standardized so water freezes at 32°F and boils at 212°F. It remains the primary scale for daily weather and cooking in the United States.

Kelvin (absolute temperature)

The Kelvin scale starts at absolute zero (-273.15°C), the theoretical point where all molecular motion stops. It has no negative values. Scientists use Kelvin for thermodynamic calculations. One Kelvin increment equals one Celsius degree — making conversion simple: K = °C + 273.15.

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How it works

Three steps, no setup

Enter a temperature

Pick the scale your value is currently in.

See every conversion

All eight scales update together as you type.

Copy the one you need

Useful for science, cooking, and international unit conversion.

Common questions

Frequently asked questions

Why include obscure scales like Rømer?

They are less common today but still appear in historical texts, older scientific instruments, and certain European contexts — included here for completeness.

What is absolute zero on each scale?

It is 0 K, -273.15°C, -459.67°F, and 0°R on the Rankine scale — the point where all four scales agree there is no thermal energy left.

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Three steps, no setup

Enter a temperature

See every conversion

Copy the one you need

Frequently asked questions

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Temperature Scales Explained

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Kelvin (absolute temperature)