About this Temperature Converter
Temperature scales vary by region and application. The US uses Fahrenheit for weather and cooking, most of the world uses Celsius, and scientists use Kelvin. This tool bridges the gap with instant conversion formulas.
Who this calculator is for
- Travelers, cooks, and weather readers switching between Fahrenheit and Celsius.
- Students and lab users who need Kelvin alongside consumer temperature scales.
- HVAC, appliance, and process teams cross-checking temperature specs from different sources.
When to use it
- Use it when a recipe, forecast, or appliance manual uses a different temperature scale than you expect.
- Use it to compare lab or engineering readings expressed in Celsius, Fahrenheit, and Kelvin.
- Use it when validating threshold temperatures for storage, comfort, or equipment operation.
How to use this calculator
- Enter the Temperature value.
- Select the From scale (C, F, or K).
- Select the To scale.
- The tool calculates the conversion instantly.
Key assumptions
- Temperature conversions use exact scale formulas with Celsius as the intermediate reference.
- The calculator converts absolute temperature values, not temperature differences or rates of change.
- Kelvin values below absolute zero are mathematically convertible here but are not physically meaningful.
Accuracy and testing
Review formula sources, default test cases, assumptions, unit handling, rounding rules, and changelog for this calculator.
How this calculator works
Unlike other units, temperature conversion involves addition/subtraction, not just multiplication.
* C to F: (C × 1.8) + 32
* F to C: (F - 32) / 1.8
* C to K: C + 273.15
* K to C: K - 273.15
Inputs explained
Celsius (°C)
Based on the freezing point (0°) and boiling point (100°) of water.
Fahrenheit (°F)
US standard. Freezing is 32°, boiling is 212°.
Kelvin (K)
Scientific absolute scale. 0 K is absolute zero (no thermal energy).
Understanding your results
The result shows the equivalent temperature on the target scale. -40° is the unique point where Celsius and Fahrenheit are the same.
Example scenarios
Body Temp
98.6 °F converts to 37.0 °C.
Room Temp
20 °C converts to 68 °F.
Absolute Zero
0 K converts to -273.15 °C.
Key Features
- Supports 3 major scales
- Handles negative values
- Formula display
Tips & Best Practices
- To convert C to F mentally: Double C, subtract 10%, add 32. (Example: 20 -> 40 -> 36 -> 68).
- Kelvin never uses the degree symbol (°). It is just 'Kelvin'.
Glossary of Terms
- Absolute Zero
- The theoretical lowest possible temperature where atoms stop moving (0 K).
- Boiling Point
- 100°C or 212°F at sea level.