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Temperature Converter
Convert between Celsius, Fahrenheit, Kelvin and Rankine instantly.
All conversions
°Celsius—
°Fahrenheit—
Kelvin—
°Rankine—
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How to Use This Converter
Type a temperature in any unit and every scale updates at once. Use the swap button to flip the direction of the two main boxes.
- Water freezes at 0°C = 32°F = 273.15 K.
- Water boils at 100°C = 212°F = 373.15 K.
- Absolute zero is 0 K = −459.67°F.
Frequently Asked Questions
How do I convert Fahrenheit to Celsius?
Subtract 32, then multiply by 5/9. (98.6°F − 32) × 5/9 = 37°C.
Why does −40° show the same in °C and °F?
Because the two scales intersect at −40: −40°C = −40°F, the only point where they are equal.
What is Kelvin used for?
Science. It starts at absolute zero with no negative values, which makes many physics formulas simpler.
What is Rankine?
An absolute scale based on Fahrenheit — absolute zero is 0°R = −459.67°F. Used mostly in some US engineering fields.
Practical Example
Convert 25°C to Fahrenheit and Kelvin. For Fahrenheit: 25 × 9⁄5 + 32 = 45 + 32 = 77°F. For Kelvin: 25 + 273.15 = 298.15 K.
- In Rankine: (25 + 273.15) × 9⁄5 = 536.67°R
- Formula F = C × 9⁄5 + 32
- Formula K = C + 273.15
What Your Results Mean
- °Celsius — water freezes at 0°C and boils at 100°C.
- °Fahrenheit — water freezes at 32°F and boils at 212°F.
- Kelvin (K) — absolute scale; 0 K = −273.15°C, no negative values.
- °Rankine — absolute Fahrenheit scale; 0°R = −459.67°F.
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