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Temperature Converter

Convert between Celsius, Fahrenheit, Kelvin, Rankine, Delisle, and more — instantly.

Quick Reference Chart

Common temperatures for everyday context.

Reference Point °C °F K
Absolute Zero −273.15 −459.67 0
Water Freezes 0 32 273.15
Room Temperature 20–22 68–72 293–295
Human Body 37 98.6 310.15
Water Boils 100 212 373.15
Hot Desert Day 50 122 323.15
Steel Melts 1370 2498 1643.15
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The Science Behind Temperature Scales

Temperature scales were developed independently across history — each rooted in a different measurement philosophy. Today, Celsius dominates science and most of the world, while Fahrenheit remains entrenched in the United States, and Kelvin is the gold standard for physics and engineering.

Understanding how to convert between them is essential for cooking, weather, chemistry, manufacturing, and international communication. Our converter handles all conversions instantly — giving you the formula too, not just the result.

Celsius (°C)

Created by Anders Celsius in 1742, it sets 0°C as the freezing point and 100°C as the boiling point of water at sea level. It is the most widely used scale globally and is the basis for the Kelvin scale.

Fahrenheit (°F)

Proposed by Daniel Gabriel Fahrenheit in 1724. Water freezes at 32°F and boils at 212°F — a 180° span. The scale is still standard in the USA for everyday weather and cooking.

Kelvin (K)

The SI unit of thermodynamic temperature. 0 K is absolute zero — the coldest possible temperature where all molecular motion stops. It uses the same degree size as Celsius: 0°C = 273.15 K.

Rankine, Delisle & More

Rankine is the Fahrenheit equivalent of Kelvin — an absolute scale. Delisle runs downward from water's boiling point. Newton and Réaumur are historical curiosities still used in niche scientific contexts.

When Do You Actually Need This?

Temperature conversion comes up more than you think: adjusting recipes from American cookbooks (°F) to your oven (°C), reading international weather forecasts, understanding oven settings, studying thermodynamics, or configuring hardware sensors. With 8 supported scales, this converter handles them all.

Frequently Asked Questions

Multiply by 9/5 (or 1.8) then add 32. For example: 100°C × 1.8 + 32 = 212°F. Our tool does this instantly and shows you the formula.
Subtract 32 first, then multiply by 5/9. Example: (98.6°F − 32) × 5/9 = 37°C — normal human body temperature.
Simply add 273.15 to the Celsius value. Water boils at 100°C = 373.15 K. Kelvin never goes negative because 0 K is the absolute coldest anything can be.
−40 degrees is the crossover point. At −40°C and −40°F, both scales read the same value. It's a fun fact that trips people up in temperature trivia.
Fahrenheit was adopted before the metric system was standardized. The US began metric adoption in the 1970s but the everyday transition stalled. Most US scientific, medical, and engineering work already uses Celsius and Kelvin.
Absolute zero — the lowest possible temperature — is 0 K, −273.15°C, or −459.67°F. At this temperature, all particle motion theoretically stops. It has never been fully achieved in practice.
Rankine (°R) is an absolute temperature scale based on Fahrenheit degrees. It's used in some US engineering applications, especially thermodynamic calculations where absolute zero is needed but Fahrenheit units are preferred over Kelvin.

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