C = (F - 32) / 1.8
C = K - 273.15
F = C * 1.8 + 32
F = C + 273.15
C = Celsius
F = Fahrenheit
K = Kelvin
Convert between Celsius (°C), Fahrenheit (°F), and Kelvin (K) with instant results. Ideal for meteorology, engineering, science, travel, and education. Supports real-time bidirectional conversion with high precision.
| Unit | Full Name | Description | Conversion Formula |
|---|---|---|---|
| °C | Degree Celsius | The most widely used scale; water freezes at 0°C and boils at 100°C. | - |
| °F | Degree Fahrenheit | Used primarily in the United States; water freezes at 32°F and boils at 212°F. | °F = (9/5) × °C + 32 |
| K | Kelvin | Absolute temperature scale; 0 K is absolute zero (-273.15°C); used in physics and chemistry. | K = °C + 273.15 |
°F = (9/5) × °C + 32
°C = (°F - 32) × 5/9
K = °C + 273.15
°C = K - 273.15
°F = (9/5) × (K - 273.15) + 32
Normal body temperature is 37°C.
°F: (9/5) × 37 + 32 = 98.6°F
K: 37 + 273.15 = 310.15 K
98.6°F is a typical body temperature.
°C: (98.6 - 32) × 5/9 = 37°C
K: 37 + 273.15 = 310.15 K
0 K is absolute zero.
°C: 0 - 273.15 = -273.15°C
°F: (9/5) × (-273.15) + 32 ≈ -459.67°F
Water freezes at 0°C.
°F: (9/5) × 0 + 32 = 32°F
K: 0 + 273.15 = 273.15 K
At -40 degrees:
-40°C = -40°F — this is the only point where both scales read the same value.
1.Meteorological data interpretation :comparing weather reports from different countries
2.Engineering design and material testing :ensuring components operate within safe temperature ranges
3.Chemical reaction temperature control :precise lab conditions require Kelvin or Celsius
4.Physics experiments and academic research :absolute temperature (Kelvin) is essential for thermodynamics
5.Travel and cross-cultural communication :understanding weather forecasts in the US vs. Europe
6.Teaching and student learning : helping students grasp unit conversion and scientific scales
1.ISO 80000-5: Quantities and units — Part 5: Thermodynamics
2.IEC 60050: International Electrotechnical Vocabulary
3.NIST Special Publication 811: Guide for the Use of the International System of Units (SI)
4.Textbooks: "Thermodynamics" by Cengel & Boles, "University Physics" by Young & Freedman
Use the formula: °F = (9/5) × °C + 32
Example: 20°C → (9/5) × 20 + 32 = 68°F
The Kelvin scale is an absolute temperature scale where 0 K is absolute zero (-273.15°C).
To convert: K = °C + 273.15
So, 0°C = 273.15 K, and room temperature (~20°C) = 293.15 K.
Fahrenheit was developed earlier and became standardized in the US.
It has finer increments (e.g., 32°F vs. 0°C), making it easier to distinguish small changes in everyday temperatures.
However, most of the world uses Celsius due to its simplicity and alignment with the metric system.
Yes! Use the formula: K = (°F - 32) × 5/9 + 273.15
Or step-by-step: first convert °F to °C, then add 273.15.
Yes!
A rough estimate: multiply °C by 2 and add 30.
Example: 20°C → 20×2 + 30 = 70°F (actual: 68°F)
This works well for weather temperatures but not for precision work.
Absolute zero is 0 K = -273.15°C.
Convert to Fahrenheit: (9/5) × (-273.15) + 32 ≈ -459.67°F
This is the lowest possible temperature, where all molecular motion stops.
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