What is absolute zero?

Absolute zero is the lowest possible temperature: −273.15°C (−459.67°F or 0 K). At this temperature, particles would have minimum kinetic energy. It is a theoretical limit — in practice, temperatures can get extremely close but never quite reach absolute zero.

At what temperature are Celsius and Fahrenheit equal?

Celsius and Fahrenheit are equal at −40°. At −40°C = −40°F. This is a useful fact to remember.

Why does the US use Fahrenheit while most countries use Celsius?

The US retained Fahrenheit from the British colonial era. Most countries switched to Celsius (part of the metric system) during the 18th and 19th centuries. Fahrenheit was developed by Daniel Gabriel Fahrenheit in 1724; Celsius was developed by Anders Celsius in 1742.

What is normal body temperature in Celsius and Fahrenheit?

Normal human body temperature is approximately 37°C (98.6°F). However, 'normal' can range from 36.1°C to 37.2°C (97°F to 99°F) depending on the individual and time of day.

What is the difference between Kelvin and Celsius?

Kelvin and Celsius use identical degree sizes — a change of 1°C equals a change of 1 K. The difference is only in the zero point: 0 K = −273.15°C. Kelvin is used in scientific contexts because it eliminates negative temperatures, simplifying thermodynamic equations.

Conversion

Temperature Converter

Convert between Celsius, Fahrenheit, and Kelvin instantly with formulas and common reference points.

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Celsius (°C)

Enter any one field to convert all

Fahrenheit (°F)

Kelvin (K)

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Results

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°F = (°C × 9/5) + 32 | K = °C + 273.15

Variables

°CDegrees Celsius

°FDegrees Fahrenheit

KKelvin (no degree symbol)

Explanation

Celsius and Fahrenheit use different zero points and scales. Celsius: 0° = water freezes, 100° = water boils. Fahrenheit: 32° = water freezes, 212° = water boils. Kelvin uses the same scale as Celsius but starts at absolute zero (−273.15°C), the coldest possible temperature.

What is the Temperature Converter?

Temperature conversion is one of the most common unit conversion tasks. Whether reading a weather forecast in an unfamiliar unit, following a recipe from another country, or working with scientific data, quickly converting between Celsius, Fahrenheit, and Kelvin is an everyday need.

How to Use This Calculator

Enter a temperature in any of the three fields — Celsius, Fahrenheit, or Kelvin — and the calculator instantly converts to all other scales simultaneously. It also identifies the temperature's reference point (freezing, boiling, body temperature, etc.).

Worked Examples

Boiling water: 100°C to °F and K

Converting the boiling point of water at sea level.

°F = °C × 9/5 + 32: 100 × 1.8 + 32 = 212 °F
K = °C + 273.15: 100 + 273.15 = 373.15 K

100°C = 212°F = 373.15 K.

Body temperature: 98.6°F to °C

Converting a Fahrenheit fever reading.

°C = (°F − 32) × 5/9: (98.6 − 32) × 5/9 = 37 °C

98.6°F = 37°C — normal human body temperature.

Celsius and Fahrenheit read the same at −40°; everywhere else you need the ×9/5 (or ×5/9) step, not a flat offset.

Why Use MyCalculatorsHub's Temperature Calculator?

Unlike basic converters that only go one direction, this tool converts all three scales at once, saving time when you need multiple conversions. The reference point feature provides intuitive context for unfamiliar temperatures.

Common Mistakes to Avoid

Kelvin does not use the degree symbol (it is '373.15 K', not '373.15 °K'). Also, Kelvin cannot be negative — if your calculation gives a negative Kelvin value, you have made an error in the conversion.