🌡️ Temperature Converter

Convert between Celsius, Fahrenheit, and Kelvin instantly — accurate to two decimal places.

Choose the unit you're converting from, enter a value, and see the equivalent in the other two scales instantly.

CONVERTED TEMPERATURE
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Celsius
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Fahrenheit
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Kelvin
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Scale
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How Temperature Conversion Works

Celsius, Fahrenheit, and Kelvin are the three most common temperature scales. Celsius is used in most of the world for everyday purposes, Fahrenheit is still standard in the United States, and Kelvin is the scale scientists use because it starts at absolute zero — the coldest possible temperature.

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

Quick Reference Points

Reference PointCelsiusFahrenheitKelvin
Absolute zero-273.15°C-459.67°F0 K
Water freezes0°C32°F273.15 K
Room temperature21°C70°F294.15 K
Average body temperature37°C98.6°F310.15 K
Water boils (sea level)100°C212°F373.15 K

Kelvin never uses a degree symbol (it's "310 K", not "310°K") because it's an absolute scale — zero Kelvin represents a true absence of thermal energy, not an arbitrary reference point like the freezing point of water.

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❓ Frequently Asked Questions

What's the easiest way to convert Celsius to Fahrenheit in my head?
A quick estimate is to double the Celsius value and add 30 — it's not exact, but it gets you close. For precision, use the exact formula: °F = (°C × 9/5) + 32.
Why does Kelvin have no negative numbers?
Kelvin is an absolute temperature scale starting at absolute zero (-273.15°C), the theoretical point where all molecular motion stops. Since nothing can be colder than that, Kelvin values are never negative.
Why does the US still use Fahrenheit?
The US, along with a few other countries, adopted Fahrenheit before the widespread metric standardization of the 20th century and never fully transitioned to Celsius for everyday use, unlike most of the world.
At what temperature are Celsius and Fahrenheit equal?
Celsius and Fahrenheit intersect at -40 degrees — that is, -40°C equals exactly -40°F, the only point where the two scales match.
Is Kelvin used in everyday weather forecasts?
No, Kelvin is used almost exclusively in scientific, engineering, and astronomical contexts. Everyday weather forecasts use Celsius or Fahrenheit depending on the country.

🏆 About This Tool — Accuracy & Trust

🔒 Data Privacy: All calculations run entirely within your browser using JavaScript. Nothing you enter here is ever transmitted to our servers, stored, sold, or shared.

📐 Accuracy Note: This tool uses standard, widely published formulas and guidelines. Results are estimates for informational purposes; for financial, medical, or engineering decisions, consult a licensed professional.

📅 Last Updated: September 2026.