Temperature Converter
Convert Celsius, Fahrenheit, Kelvin and Rankine in real time.
Type any temperature to convert it between Celsius, Fahrenheit, Kelvin and Rankine. Results update as you type, with the formulas shown below for reference.
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Temperature conversion formulas
Temperature scales are not simply scaled multiples of each other — they each have a different zero point. Use the formulas below to convert by hand.
| From | To | Formula | Example |
|---|---|---|---|
| Celsius | Fahrenheit | F = C × 9/5 + 32 | 25 °C = 77 °F |
| Fahrenheit | Celsius | C = (F − 32) × 5/9 | 100 °F ≈ 37.78 °C |
| Celsius | Kelvin | K = C + 273.15 | 0 °C = 273.15 K |
| Kelvin | Celsius | C = K − 273.15 | 300 K = 26.85 °C |
| Fahrenheit | Kelvin | K = (F − 32) × 5/9 + 273.15 | 32 °F = 273.15 K |
| Celsius | Rankine | °R = (C + 273.15) × 9/5 | 0 °C = 491.67 °R |
Celsius to Fahrenheit conversion table
Quick lookup for common Celsius values converted to Fahrenheit.
| Celsius (°C) | Fahrenheit (°F) |
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Why use this temperature converter?
A precise tool for cooking, weather, fever readings and scientific work.
- Real-time updates with adjustable decimals.
- Supports negative values, including absolute zero (−273.15 °C).
- Includes Rankine for engineering use cases.
- Mobile-friendly and ad-free.
- No data leaves your device.
Frequently asked questions
At what temperature do Celsius and Fahrenheit meet?
They are equal at −40°: −40 °C = −40 °F. This is the only point at which the two scales agree.
What is normal body temperature in Celsius and Fahrenheit?
Normal core body temperature is around 37 °C, which is 98.6 °F. Healthy adults vary between roughly 36.1 °C (97 °F) and 37.2 °C (99 °F).
What is absolute zero?
Absolute zero is the lowest possible temperature: 0 K = −273.15 °C = −459.67 °F. The Kelvin scale starts there, which is why it has no negative values.
Why does Fahrenheit have such an odd-looking formula?
Fahrenheit was originally calibrated against a brine ice mixture (0 °F) and human body temperature (≈ 96 °F). The modern definition pegs water’s freezing point at 32 °F and boiling point at 212 °F at standard pressure — a 180-degree gap, which is where the 9/5 ratio comes from.
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