Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin instantly. Enter a value, choose your unit, and see all conversions at once.
How to Use the Temperature Converter
Converting temperatures is straightforward with this tool:
- Enter a value in the temperature input field. You can use whole numbers or decimals.
- Select the source unit from the dropdown (Celsius, Fahrenheit, or Kelvin).
- View all conversions instantly in the results table below. The tool calculates as you type.
- Click Copy next to any result to copy it to your clipboard for easy pasting elsewhere.
About Temperature Scales
Temperature is a measure of the average kinetic energy of particles in a substance. The three most common scales are Celsius, Fahrenheit, and Kelvin. Celsius, used worldwide for everyday purposes, sets water's freezing point at 0° and boiling point at 100°. Fahrenheit, primarily used in the United States, sets these at 32° and 212° respectively. Kelvin is the SI unit for temperature in science, starting at absolute zero (the point where all molecular motion stops).
Key conversion formulas include: F = (C × 9/5) + 32, C = (F - 32) × 5/9, and K = C + 273.15. Understanding these relationships is essential for science, cooking, weather forecasting, and international travel.
Common Temperature Conversions
The table below lists frequently searched temperature conversions for quick reference. These cover everyday temperatures you are likely to encounter in cooking, weather, health, and science.
| Fahrenheit (°F) | Celsius (°C) | Kelvin (K) | Context |
|---|---|---|---|
| -40°F | -40°C | 233.15 K | Where F and C are equal |
| 0°F | -17.78°C | 255.37 K | Extreme cold weather |
| 32°F | 0°C | 273.15 K | Water freezing point |
| 68°F | 20°C | 293.15 K | Room temperature |
| 72°F | 22.22°C | 295.37 K | Comfortable indoor temp |
| 98.6°F | 37°C | 310.15 K | Normal body temperature |
| 100°F | 37.78°C | 310.93 K | Fever threshold |
| 212°F | 100°C | 373.15 K | Water boiling point |
| 350°F | 176.67°C | 449.82 K | Common oven temperature |
| 450°F | 232.22°C | 505.37 K | High oven / pizza temp |
Temperature Conversion Formulas
There are six core formulas for converting between Celsius, Fahrenheit, and Kelvin. Below are the formulas with worked examples showing step-by-step math.
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
Worked Examples
- Convert 350°F to Celsius: °C = (350 - 32) × 5/9 = 318 × 0.5556 = 176.67°C
- Convert 25°C to Fahrenheit: °F = (25 × 1.8) + 32 = 45 + 32 = 77°F
- Convert 25°C to Kelvin: K = 25 + 273.15 = 298.15 K
- Convert 300 K to Fahrenheit: °F = (300 - 273.15) × 9/5 + 32 = 26.85 × 1.8 + 32 = 48.33 + 32 = 80.33°F
When You Need This Converter
Temperature conversion comes up in many everyday and professional situations. Here are the most common scenarios where this tool proves essential:
- Cooking and Baking: Recipes from different countries use different temperature scales. An American recipe calling for 350°F needs to be converted to 176.67°C for a European oven. Many international recipes list temperatures in Celsius, while US ovens are marked in Fahrenheit.
- Travel and Weather: When traveling internationally, weather forecasts are reported in Celsius in most countries. Knowing that 30°C is a warm 86°F, or that 0°C means freezing conditions at 32°F, helps you pack appropriately and plan activities.
- Health and Medicine: Body temperature is measured in Fahrenheit in the United States (normal is 98.6°F) and Celsius elsewhere (normal is 37°C). Medical professionals frequently need to convert between scales when reviewing international research or communicating with patients from different backgrounds.
- Science and Engineering: Scientific research uses Kelvin or Celsius. Engineers working with materials need precise temperature conversions for thermal expansion calculations, chemical reaction conditions, and equipment operating ranges.
Frequently Asked Questions
Multiply the Celsius temperature by 9/5 (or 1.8) and then add 32. The formula is: F = (C × 9/5) + 32. For example, 100°C = (100 × 1.8) + 32 = 212°F.
Subtract 32 from the Fahrenheit temperature and then multiply by 5/9. The formula is: C = (F - 32) × 5/9. For example, 72°F = (72 - 32) × 5/9 = 22.22°C.
Absolute zero is the lowest possible temperature. It is 0 Kelvin, -273.15°C, and -459.67°F. At this temperature, all molecular motion ceases.
Kelvin is primarily used in scientific contexts. It starts at absolute zero, making it ideal for physics and chemistry calculations. Celsius is better suited for everyday temperature measurements.
To convert Celsius to Kelvin, simply add 273.15 to the Celsius value. The formula is K = C + 273.15. For example, 25°C = 25 + 273.15 = 298.15 K.
Yes, Fahrenheit and Celsius are equal at -40 degrees. Both -40°F and -40°C represent the same temperature. This is the only point where the two scales intersect.
Normal human body temperature is approximately 37°C or 98.6°F. However, normal body temperature can range from 36.1°C (97°F) to 37.2°C (99°F) depending on the individual and time of day.
The Fahrenheit scale was developed by Daniel Gabriel Fahrenheit in 1724 and was widely adopted in English-speaking countries. While most nations switched to Celsius as part of metrication, the US retained Fahrenheit for everyday use due to familiarity and the cost of transitioning infrastructure.
A quick mental approximation is to double the Celsius value and add 30. For example, 20°C: 20 × 2 + 30 = 70°F (actual: 68°F). This method is accurate within a few degrees for everyday temperatures.