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Temperature Converter
Convert between Celsius, Fahrenheit, Kelvin, Rankine, Réaumur, Delisle, Newton, and Rømer scales. Enter a value and select units to convert instantly.
From
To
Conversion Result
Celsius (°C): 25
Fahrenheit (°F): 77.0000
Equivalent: 25.0000°C
All Conversions
| Scale | Value |
|---|---|
| Celsius (°C) | 25.0000 |
| Fahrenheit (°F) | 77.0000 |
| Kelvin (K) | 298.1500 |
| Rankine (°R) | 536.6700 |
| Réaumur (°Ré) | 20.0000 |
| Delisle (°De) | 112.5000 |
| Newton (°N) | 8.2500 |
| Rømer (°Rø) | 20.6250 |
Common Temperature Reference Points
| Point | Value |
|---|---|
| Water freezes | 0°C = 32°F = 273.15 K |
| Water boils | 100°C = 212°F = 373.15 K |
| Room temperature | 20°C = 68°F = 293.15 K |
| Body temperature | 37°C = 98.6°F = 310.15 K |
| Absolute zero | -273.15°C = -459.67°F = 0 K |
| Hot oven (350°F) | 176.67°C = 350°F |
| Cold day (0°F) | -17.78°C = 0°F |
| Surface of Sun | 5,505°C = 9,941°F = 5,778 K |
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Frequently Asked Questions
- How do I convert Celsius to Fahrenheit?
- Multiply by 9/5 and add 32: F = C × 9/5 + 32. For example, 25°C × 9/5 + 32 = 77°F.
- How do I convert Fahrenheit to Celsius?
- Subtract 32 and multiply by 5/9: C = (F - 32) × 5/9. For example, (68°F - 32) × 5/9 = 20°C.
- How do I convert Celsius to Kelvin?
- Add 273.15: K = C + 273.15. For example, 25°C + 273.15 = 298.15 K.
- How do I convert Kelvin to Celsius?
- Subtract 273.15: C = K - 273.15. For example, 300 K - 273.15 = 26.85°C.
- How do I convert Kelvin to Fahrenheit?
- F = (K - 273.15) × 9/5 + 32. For example, 300 K = 80.33°F.
- How do I convert Fahrenheit to Kelvin?
- K = (F - 32) × 5/9 + 273.15. For example, 68°F = 293.15 K.
- What is absolute zero?
- Absolute zero is 0 K (-273.15°C, -459.67°F), the lowest possible temperature where molecular motion stops.
- At what temperature are Celsius and Fahrenheit equal?
- They are equal at -40°, where -40°C = -40°F.
- What is the Rankine scale?
- Rankine is an absolute temperature scale using Fahrenheit degrees. Absolute zero = 0°R, water freezes at 491.67°R.
- What is the Réaumur scale?
- The Réaumur scale sets water freezing at 0°Ré and boiling at 80°Ré. Used historically in Europe.
- What is the Delisle scale?
- Delisle is an inverted scale where water boils at 0°De and freezes at 150°De. Higher numbers = colder.
- What is the Newton scale?
- Developed by Isaac Newton, water freezes at 0°N and boils at 33°N.
- What is the Rømer scale?
- Developed by Ole Rømer, water freezes at 7.5°Rø and boils at 60°Rø.
- How do I convert oven temperatures?
- 350°F = 176.67°C = 449.82 K = 809.67°R. Most recipes use 350°F (180°C) for baking.
- What is room temperature in Celsius?
- Room temperature is typically 20-25°C (68-77°F, 293-298 K).
- What is body temperature in Celsius?
- Normal human body temperature is 37°C (98.6°F, 310.15 K).
- How do I convert for cooking?
- Common oven temps: 300°F = 149°C, 350°F = 177°C, 400°F = 204°C, 450°F = 232°C.
- What is the formula for temperature conversion?
- Celsius to Fahrenheit: F = C × 9/5 + 32. Celsius to Kelvin: K = C + 273.15. Fahrenheit to Kelvin: K = (F - 32) × 5/9 + 273.15.
- Why does the US use Fahrenheit?
- The US uses Fahrenheit due to historical adoption by Daniel Fahrenheit in the 18th century. It remains the official scale for weather and cooking in the US.
- How do I convert Celsius to Rankine?
- R = (C + 273.15) × 9/5. For example, 100°C = 671.67°R.
- How do I convert Rankine to Kelvin?
- K = R × 5/9. For example, 671.67°R = 373.15 K.
- What temperature does water boil at high altitude?
- Water boils at lower temperatures at high altitude. At 3,000 m, water boils at about 90°C instead of 100°C.
- What is the triple point of water?
- The triple point of water is 0.01°C (273.16 K, 32.018°F), where solid, liquid, and vapor coexist in equilibrium.
- How do I convert Celsius to Réaumur?
- Ré = C × 4/5. For example, 100°C = 80°Ré.
- How do I convert Réaumur to Celsius?
- C = Ré × 5/4. For example, 80°Ré = 100°C.
- What is the temperature of liquid nitrogen?
- Liquid nitrogen boils at -196°C (-320°F, 77 K, 139°R).
- What is the temperature of dry ice?
- Dry ice (solid CO₂) sublimes at -78.5°C (-109.3°F, 194.7 K).
- How do weather forecasts convert temperatures?
- Meteorologists use C = (F - 32) × 5/9. A quick estimate: subtract 30 then halve for approximate °C from °F.
- What is the hottest temperature possible?
- The Planck temperature (1.417 × 10³² K) is theorized as the maximum possible temperature in physics.
- How do I convert between Celsius and Delisle?
- De = (100 - C) × 3/2. For example, 100°C = 0°De, 0°C = 150°De.