Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin temperature scales instantly.
How to Use the Temperature Converter
Select your source and target temperature scales, enter a value, and see the result instantly. Temperature conversion is not factor-based like other units — each scale has its own formula.
Temperature Conversion Formulas
°F = (°C × 9/5) + 32
°C = (°F − 32) × 5/9
K = °C + 273.15
Temperature Scales Explained
- Celsius (°C): Used by most countries worldwide. Water freezes at 0°C and boils at 100°C.
- Fahrenheit (°F): Used primarily in the United States. Water freezes at 32°F and boils at 212°F.
- Kelvin (K): The SI unit of temperature. Absolute zero (0 K) is the lowest possible temperature, equal to −273.15°C.
Temperature Conversion Example
Convert 98.6°F (normal body temperature) to Celsius:
- Formula: °C = (°F − 32) × 5/9
- Calculation: (98.6 − 32) × 5/9 = 66.6 × 0.5556 = 37°C
Convert 100°C (boiling point of water) to Kelvin: 100 + 273.15 = 373.15 K.
Frequently Asked Questions
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Multiply the Celsius temperature by 9/5 (or 1.8) and then add 32. For example, 25°C = (25 × 1.8) + 32 = 77°F.
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−40 degrees is the same on both scales. −40°C = −40°F.
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Absolute zero is 0 Kelvin (−273.15°C or −459.67°F). It is the theoretical lowest temperature where all molecular motion stops.
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The Fahrenheit scale was developed by Daniel Gabriel Fahrenheit in 1724 and was widely adopted before the metric system. The US has continued using it for everyday weather and cooking measurements.
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First convert Kelvin to Celsius by subtracting 273.15, then convert Celsius to Fahrenheit: °F = (K − 273.15) × 9/5 + 32.
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Normal body temperature is approximately 37°C, 98.6°F, or 310.15 K.