Temperature Converter
One converter for all three scales. Choose the units, type a value, and copy the result or a link to it.
Temperature converter
How to convert 25°C to °F
Follow these steps to check the answer yourself.
- 1
Write the conversion formula
To convert Celsius to Fahrenheit, multiply by 9/5 and add 32.
°F = (°C × 9/5) + 32
- 2
Substitute the Celsius value
Replace °C with 25.
°F = (25 × 9/5) + 32
- 3
Multiply by 9/5
Work out the bracket first.
25 × 9/5 = 45
- 4
Add 32
Add the 32° offset to get Fahrenheit.
45 + 32 = 77
Answer: 25°C = 77°F
Which scale is used where
Celsius is the everyday scale in almost every country, and in science classrooms worldwide. Fahrenheit is still standard for weather, cooking and medicine in the United States and a few other places. Kelvin is the SI unit, used for physics, chemistry, astronomy and the colour temperature of light bulbs (a "2700 K" warm white bulb, for example).
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Reference temperatures on all three scales
Well-known temperatures, from absolute zero to molten iron, in Celsius, Fahrenheit and kelvin.
| Reference point | °C | °F | K |
|---|---|---|---|
| absolute zero | -273.15°C | -459.67°F | 0 K |
| the boiling point of liquid nitrogen | -195.8°C | -320.44°F | 77.35 K |
| the coldest air temperature ever recorded on Earth (Vostok Station, Antarctica, 1983) | -89.2°C | -128.56°F | 183.95 K |
| the surface of dry ice | -78.5°C | -109.3°F | 194.65 K |
| the point where the Celsius and Fahrenheit scales meet | -40°C | -40°F | 233.15 K |
| a standard home freezer | -18°C | -0.4°F | 255.15 K |
| the freezing point of water | 0°C | 32°F | 273.15 K |
| the inside of a typical refrigerator | 4°C | 39.2°F | 277.15 K |
| typical room temperature | 20°C | 68°F | 293.15 K |
| average human body temperature | 37°C | 98.6°F | 310.15 K |
| the hottest air temperature ever recorded (Death Valley, California, 1913) | 56.7°C | 134.06°F | 329.85 K |
| the temperature used to pasteurise milk (HTST method) | 72°C | 161.6°F | 345.15 K |
| the boiling point of water at sea level | 100°C | 212°F | 373.15 K |
| a moderate baking oven | 180°C | 356°F | 453.15 K |
| the melting point of tin | 231.9°C | 449.42°F | 505.05 K |
| the melting point of lead | 327.5°C | 621.5°F | 600.65 K |
| the melting point of aluminium | 660.3°C | 1220.54°F | 933.45 K |
| the melting point of iron | 1538°C | 2800.4°F | 1811.15 K |
Conversion formulas
Celsius to Fahrenheit
°F = (°C × 9/5) + 32
Fahrenheit to Celsius
°C = (°F − 32) × 5/9
Celsius to Kelvin
K = °C + 273.15
Kelvin to Celsius
°C = K − 273.15
Sources
- SI Units – Temperature (NIST (US National Institute of Standards and Technology))
Conversion formulas between °C, °F and K, and the 273.15 offset.
- The kelvin (BIPM (International Bureau of Weights and Measures))
Definition of the kelvin and absolute zero.
Written and checked by Abdul Manan.
Last updated . Results are for general information; see the disclaimer.
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