Temperature Converter
A temperature converter translates a value between Celsius, Fahrenheit, and Kelvin — the three scales used in everyday weather, US customary measurement, and scientific work. Unlike length or mass, temperature scales are offset rather than simply scaled (0°C is 32°F, not 0°F), which is why "celsius to fahrenheit" is one of the most frequently searched conversions on the web and cannot be handled by a generic multiply-by-a-ratio converter.
How it works
- Enter a value and choose the unit you're converting from and to.
- Read the converted value.
Formula °F = °C × 9/5 + 32; K = °C + 273.15; converts through a common base of Celsius
Frequently asked questions
Why is 0°C equal to 32°F instead of 0°F?
Celsius and Fahrenheit use different zero points and different-sized degrees — Fahrenheit sets 32° at water's freezing point and 212° at boiling, so the scales are offset, not just scaled, which is why conversion needs both a multiply and an add step.
What is Kelvin used for?
Kelvin is the SI base unit for temperature, starting at absolute zero (0 K = -273.15°C, the coldest physically possible temperature) — it's used in science and engineering because it has no negative values.
What is normal human body temperature in each scale?
Approximately 37°C, 98.6°F, or 310.15 K — though normal ranges vary slightly by person and by how the temperature is measured.
Is my data uploaded anywhere?
No. Conversion runs entirely in your browser.
Can Kelvin be negative?
No — 0 K is absolute zero, the theoretical lower limit of temperature, so Kelvin values are never negative. Celsius and Fahrenheit can go negative because their zero points are arbitrary reference marks, not a physical limit.