Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin temperature scales with precision.
Temperature
From / To
All Scales
Reference Temperatures
| °C | °F | K | |
|---|---|---|---|
| Absolute Zero | -273.15 | -459.67 | 0 |
| Water Freezes | 0 | 32 | 273.15 |
| Body Temperature | 37 | 98.6 | 310.15 |
| Water Boils | 100 | 212 | 373.15 |
Conversion Formulas
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Understanding Temperature Scales
Temperature is measured using three main scales worldwide, each with its own history and practical applications.
Celsius (°C): Used by most countries for everyday purposes. Water freezes at 0°C and boils at 100°C.
Fahrenheit (°F): Used primarily in the United States. Water freezes at 32°F and boils at 212°F.
Kelvin (K): The SI unit for temperature, used in science. Starts at absolute zero (0 K = -273.15°C).
Conversion Formulas
Quick mental math for C to F: Double the Celsius, then add 30. Example: 20°C → 40 + 30 = 70°F (actual: 68°F). Close enough for everyday use!
Key Temperature References
| Description | Celsius | Fahrenheit | Kelvin |
|---|---|---|---|
| Absolute Zero | -273.15°C | -459.67°F | 0 K |
| Water Freezes | 0°C | 32°F | 273.15 K |
| Room Temperature | 20-22°C | 68-72°F | 293-295 K |
| Body Temperature | 37°C | 98.6°F | 310.15 K |
| Water Boils | 100°C | 212°F | 373.15 K |
Where the Scales Cross
There's one temperature where Celsius and Fahrenheit are equal:
This is easy to verify: (-40 × 9/5) + 32 = -72 + 32 = -40
Practical Applications
Weather: Most countries report weather in Celsius. US uses Fahrenheit.
- Freezing: 0°C / 32°F
- Hot summer day: 30°C / 86°F
- Very hot: 40°C / 104°F
Cooking: Recipes from different countries use different scales.
- Low oven: 150°C / 300°F
- Moderate oven: 180°C / 350°F
- Hot oven: 220°C / 425°F
Health: Body temperature varies by scale.
- Normal: 36.5-37.5°C / 97.7-99.5°F
- Fever: >38°C / >100.4°F
Helpful Tips
- Comfort range: 20-25°C (68-77°F) is comfortable for most people
- Swimming: Pools are typically heated to 26-28°C (79-82°F)
- Refrigerator: Should be set to 3-5°C (37-41°F)
- Freezer: Should be at -18°C (0°F) or below