Converters

Temperature Converter

Free temperature converter: convert Celsius to Fahrenheit, Fahrenheit to Celsius, Kelvin to any unit, and all combinations instantly.

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Deep dive guides

A LITTLE CONTEXT · 4 MIN READHow Temperature Scales Work

All 12 related guides

Why the World Uses Two Measurement Systems — How metric and imperial both survived: decimal design vs inherited units, the conversion-factor logic, temperature's offset, and mental shortcuts.
How Temperature Scales Work — Why Fahrenheit, Celsius, and Kelvin need different zero points, the three conversion formulas, and why −40 is the same on both weather scales.
Wind Chill Explained: How Wind Turns Cold Into Danger — The NWS wind chill formula, why it only applies below 50°F and 3 mph, and how the frostbite-time bands of the official chart are drawn.
Heat Index Explained: What Humidity Does to a Hot Day — Why 90°F can feel like 106°F: the Rothfusz regression behind the NWS heat index, its two humidity adjustments, and the official caution bands.
Cloud Base Explained: Two Thermometer Readings, One Height — The 2.5°C-per-1000-ft spread rule that turns a temperature and a dew point into an estimated cumulus cloud base — plus when it predicts fog instead.
Dew Point Explained: The Magnus Formula and Why Muggy Air Feels Heavy — The Clausius–Clapeyron relation behind dew point, the Magnus constants, the comfort bands and why dew point beats relative humidity for mugginess.
Degree Days Explained: How Weather Turns Into Energy Bills — Heating and cooling degree days — the accumulation that energy managers use to weather-normalise fuel use, and how to pick the right base temperature.
Wet-Bulb Temperature Explained: The Number That Limits Human Cooling — Why a wet wick reads the true heat-stress limit, how the Stull formula computes it, and why 35 °C wet bulb is the survivability threshold.
Why Meat Rests — and Why the Thermometer Beats the Clock — Carryover cooking, juice redistribution and the USDA safe-temperature table: how rest times and internal temps actually decide when meat is done.
Why Aquarium Heaters Are Sized in Watts per Gallon — The 2.5–5 W/gallon rule explained: heat leaks, temperature deltas, why big tanks run two heaters, and how to pick a stock size.
The Ideal Gas Law: PV = nRT From Molecules to Balloons — What PV = nRT means, why kelvin is non-negotiable, and where the ideal-gas approximation breaks.
Oven Temperatures: °F, °C and Gas Marks Explained — Converting recipes between Fahrenheit, Celsius and gas marks — plus how fan-assisted ovens change the dial.

How temperature converter works

This converter handles the three most common temperature scales: Celsius, Fahrenheit, and Kelvin. It first converts the input to Celsius as the base unit, then converts from Celsius to the target unit. The formulas are exact: C to F is (C times 9/5) plus 32, and C to K is C plus 273.15.

Celsius is the standard for most of the world and for scientific work. Fahrenheit is used in the United States for everyday temperatures. Kelvin is the absolute temperature scale used in physics and engineering, where 0 K is absolute zero, the theoretical point where molecular motion stops.

The converter handles any combination of units and rounds results to six decimal places. Common reference points: water freezes at 0 C / 32 F / 273.15 K and boils at 100 C / 212 F / 373.15 K.

Frequently asked questions

How do I convert Celsius to Fahrenheit?

Multiply the Celsius value by 9, divide by 5, then add 32. For example, 100 C becomes (100 times 9 / 5) + 32 = 212 F. The converter does this automatically.

How do I convert Fahrenheit to Celsius?

Subtract 32, multiply by 5, then divide by 9. For example, (68 - 32) times 5 / 9 = 20 C. The converter handles this for any value.

What is Kelvin?

Kelvin is the absolute temperature scale used in science. It starts at absolute zero (0 K = -273.15 C), the point where molecular motion stops. To convert Celsius to Kelvin, add 273.15.

Why are there different temperature scales?

Celsius is metric and used worldwide. Fahrenheit is used mainly in the US. Kelvin is the scientific standard because it is absolute (no negative values). The converter bridges all three.

Temperature Converter

Deep dive guides

How temperature converter works

Frequently asked questions

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