Temperature Converter: Convert Between Celsius, Fahrenheit, and Kelvin
Temperature scales vary by country and application. The United States uses Fahrenheit for weather and cooking, most of the world uses Celsius, and scientists and engineers use Kelvin for absolute temperature measurements. Our free online Temperature Converter instantly converts between all three scales with the conversion formulas displayed alongside the results. Whether you're cooking an international recipe, checking weather forecasts, or solving a science problem, get accurate temperature conversions every time.
Standard Temperature Conversion Reference
| Description | Celsius (°C) | Fahrenheit (°F) | Kelvin (K) |
|---|---|---|---|
| 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 |
| Oven Baking (moderate) | 180°C | 356°F | 453.15 K |
| Hot Summer Day | 35°C | 95°F | 308.15 K |
How to Use the Temperature Converter
Select your input temperature scale (Celsius, Fahrenheit, or Kelvin), enter the temperature value, and choose the target scale. The converter instantly displays the converted value along with the formula used. For example, 100°F converts to 37.78°C and 310.93 K. The formulas are: °C = (°F − 32) × 5/9, °F = (°C × 9/5) + 32, and K = °C + 273.15. The tool also displays common reference points to help you verify that the conversion makes sense in everyday terms.
Practical Use Cases for Temperature Conversion
International Cooking: Many recipes from Europe and Australia use Celsius oven temperatures, while American recipes use Fahrenheit. A recipe calling for 180°C (moderate oven) equals 356°F. Gas mark equivalents are also commonly listed — gas mark 4 equals 180°C or 356°F.
Weather and Travel: A forecast of 30°C in Spain sounds much more pleasant when you know it equals 86°F. Conversely, 0°F in Chicago equals -17.78°C — dangerously cold. Understanding both scales helps you pack appropriately for international travel.
Medical and Health: Body temperature of 37°C equals 98.6°F — considered normal. A fever of 38.5°C equals 101.3°F. Different countries use different scales for medical thermometers, so conversion is essential when interpreting health information from abroad.
Science and Laboratory Work: Gas law calculations require absolute temperature in Kelvin. Room temperature of 22°C equals 295.15 K. Chemistry experiments involving reaction rates, solubility, and pressure all require accurate Kelvin conversions.
Home Brewing and Smoking: Beer brewing and meat smoking require precise temperature control. Recipes may specify mash temperature in Celsius (65°C = 149°F) or smoker temperature in Fahrenheit (225°F = 107°C for classic barbecue).
Tips for Accurate Temperature Conversion
For quick mental estimation, double the Celsius temperature and add 30 to get Fahrenheit (rough approximation). For precise results, use the exact formula. When cooking, remember that convection ovens typically run about 25°F (14°C) cooler than conventional ovens. For scientific work, always use Kelvin for any formula involving volume, pressure, or energy. The Kelvin scale has no degree symbol — it is written as 300 K, not 300°K. For HVAC and thermostat settings, Pressure Converter and Energy Converter are useful companions for gas law and thermodynamic calculations.
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Converting Between All Three Scales
You will rarely need only one conversion, and the fastest way to get fluent is to learn how the three scales connect through Celsius. Both Fahrenheit and Kelvin are defined relative to Celsius, so the converter can jump between any pair of scales by passing through that base.
- 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
- Fahrenheit to Kelvin: K = (°F − 32) × 5/9 + 273.15
- Kelvin to Fahrenheit: °F = (K − 273.15) × 9/5 + 32
Work through a realistic example: a European recipe calls for a standard American baking temperature of 350°F. First convert to Celsius: (350 − 32) × 5/9 = 176.67°C. Then convert that to Kelvin: 176.67 + 273.15 = 449.82 K. The same oven temperature exists as all three numbers at once — 350°F, 176.67°C, and 449.82 K — and the converter shows the result plus the formula used so you can cross-check any single reading.
Two traps tend to trip people up. First, the Kelvin scale has no negative values and no degree symbol: it is written 300 K, not 300°K, because it is an absolute scale anchored at absolute zero (-273.15°C). A negative Kelvin output is a clear sign you reversed the formula. Second, the order of operations matters in the Fahrenheit-to-Celsius direction — you subtract 32 before you multiply by 5/9. Swapping the steps on 350°F gives (350 × 5/9) − 32 = 162.4°C instead of 176.67°C, an error large enough to ruin a recipe or skew a laboratory answer.
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Use our Temperature Converter Guide together with related tools such as Currency Converter, Area Converter, Data Converter to plan more accurately. Each calculator runs instantly in your browser with step-by-step guidance.
Written by the CalcMaster Pro Editorial Team — financial, health, and DIY tools reviewed for accuracy. All calculators run on standard, widely accepted formulas. Always confirm final numbers with a qualified professional for decisions that require official figures.