Online Temperature Converter

Online calculator for exact conversion between Celsius, Fahrenheit, and Kelvin. Fast and easy to use tool.

Temperature measures the average kinetic energy of the particles in a system. The three main scales are Celsius (°C), Fahrenheit (°F), and Kelvin (K). Celsius is widely used globally: 0°C = water freezing point, 100°C = boiling point. In the US, Fahrenheit is used: conversion formula °F = (°C × 9/5) + 32. The Kelvin scale is absolute and mandatory in science: K = °C + 273.15. Absolute zero is 0 K = -273.15°C. This converter applies the exact BIPM formulas.

Frequently Asked Questions

How do I convert Celsius to Fahrenheit?

Multiply by 1.8 and add 32.

What is the Kelvin scale?

It is the absolute temperature scale used in science, where 0K is absolute zero.

How many degrees Celsius is 100 Fahrenheit?

100°F is approximately equivalent to 37.78°C.

Why does the US use Fahrenheit?

Due to historical tradition; most other countries adopt the metric system (Celsius).

Is it safe to use this converter for science?

Yes, our algorithms use exact formulas based on physics definitions.