Temperature Converter - Convert Celsius, Fahrenheit, Kelvin, Rankine & More Units
Result:
0°C = 32°F
Temperature Converter - Easy Unit Conversion Tool
Our temperature converter helps you change temperature units quickly and easily. You can convert between Celsius, Fahrenheit, Kelvin, Rankine, and other temperature scales in seconds. This free online tool is perfect for students, teachers, cooks, scientists, and anyone who needs to convert temperature measurements.
Temperature conversion is used every day around the world. Weather reports show temperatures in different units depending on your country. Cooking recipes might use Fahrenheit while your oven shows Celsius. Scientists often work with Kelvin for their experiments. Our temperature calculator makes all these conversions simple and accurate.
The temperature converter supports eight different temperature scales. These include the most common ones like Celsius and Fahrenheit, plus special scales like Delisle, Newton, Réaumur, and Rømer. Each temperature unit has its own history and uses in different fields of science and daily life.
Understanding Different Temperature Scales
Celsius (°C)
Celsius is the most widely used temperature scale in the world. Water freezes at 0°C and boils at 100°C. Most countries use Celsius for weather reports and daily temperature measurements. It was created by Anders Celsius in 1742.
Common uses: Weather, cooking, science experiments
Fahrenheit (°F)
Fahrenheit is mainly used in the United States. Water freezes at 32°F and boils at 212°F. This scale was invented by Daniel Gabriel Fahrenheit in 1724. Many American recipes and weather reports use Fahrenheit temperatures.
Common uses: US weather, American recipes, medical thermometers
Kelvin (K)
Kelvin is the scientific temperature scale. It starts at absolute zero, the coldest possible temperature. Scientists use Kelvin for physics and chemistry calculations. Zero Kelvin equals -273.15°C or -459.67°F.
Common uses: Scientific research, physics, chemistry
Rankine (°R)
Rankine is like Kelvin but uses Fahrenheit-sized degrees. It starts at absolute zero like Kelvin. Engineers in the United States sometimes use Rankine for thermodynamics calculations. It was named after William Rankine.
Common uses: Engineering, thermodynamics, US scientific work
How to Use Our Temperature Converter
Step-by-Step Instructions
- Enter the temperature value you want to convert in the input box
- Choose the temperature unit you are converting from using the dropdown menu
- Select the temperature unit you want to convert to from the second dropdown
- The result appears instantly below the converter
- Use the conversion table and chart to see more temperature values
Tips for Accurate Conversion
- Double-check your input temperature value before converting
- Make sure you select the correct starting temperature unit
- Remember that negative temperatures are possible in most scales
- Use the practice problems to test your understanding
- Check the conversion table for common temperature values
Most Common Temperature Conversions
Celsius to Fahrenheit
0°C = 32°F (Water freezes)
20°C = 68°F (Room temperature)
37°C = 98.6°F (Body temperature)
100°C = 212°F (Water boils)
Fahrenheit to Celsius
32°F = 0°C (Water freezes)
68°F = 20°C (Room temperature)
98.6°F = 37°C (Body temperature)
212°F = 100°C (Water boils)
Celsius to Kelvin
-273.15°C = 0 K (Absolute zero)
0°C = 273.15 K (Water freezes)
25°C = 298.15 K (Room temperature)
100°C = 373.15 K (Water boils)
How Temperature Conversion Works
Input Temperature
Enter temperature value
Convert to Celsius
Use appropriate formula
Convert to Target
Apply target formula
Temperature Conversion Formulas with Calculations
Celsius Conversions
°C to °F: °F = °C × 9/5 + 32
Example: 25°C = 25 × 9/5 + 32 = 77°F
°C to K: K = °C + 273.15
Example: 25°C = 25 + 273.15 = 298.15 K
Fahrenheit Conversions
°F to °C: °C = (°F - 32) × 5/9
Example: 77°F = (77 - 32) × 5/9 = 25°C
°F to K: K = (°F - 32) × 5/9 + 273.15
Example: 77°F = (77 - 32) × 5/9 + 273.15 = 298.15 K
Special Scale Conversions
°C to °De: °De = (100 - °C) × 3/2
Example: 25°C = (100 - 25) × 3/2 = 112.5°De
°C to °N: °N = °C × 33/100
Example: 25°C = 25 × 33/100 = 8.25°N
Temperature Conversion Table
| °C | °F | K | °R | °De | Description |
|---|---|---|---|---|---|
| -273.15 | -459.7 | 0.0 | 0.0 | 559.7 | Absolute zero |
| -40 | -40.0 | 233.1 | 419.7 | 210.0 | Below freezing |
| -18 | -0.4 | 255.1 | 459.3 | 177.0 | Below freezing |
| 0 | 32.0 | 273.1 | 491.7 | 150.0 | Water freezes |
| 10 | 50.0 | 283.1 | 509.7 | 135.0 | Cool |
| 20 | 68.0 | 293.1 | 527.7 | 120.0 | Cool |
| 25 | 77.0 | 298.1 | 536.7 | 112.5 | Warm |
| 30 | 86.0 | 303.1 | 545.7 | 105.0 | Warm |
| 37 | 98.6 | 310.1 | 558.3 | 94.5 | Body temperature |
| 50 | 122.0 | 323.1 | 581.7 | 75.0 | Hot |
| 75 | 167.0 | 348.1 | 626.7 | 37.5 | Hot |
| 100 | 212.0 | 373.1 | 671.7 | 0.0 | Water boils |
| 150 | 302.0 | 423.1 | 761.7 | -75.0 | Hot |
| 200 | 392.0 | 473.1 | 851.7 | -150.0 | Hot |
| 300 | 572.0 | 573.1 | 1031.7 | -300.0 | Hot |
Temperature Units Progression Chart
-40°C
0°C
20°C
37°C
50°C
100°C
Practice Problems
Problem 1:
Convert 25°C to Fahrenheit
Solution: 25 × 9/5 + 32 = 77°F
Problem 2:
Convert 98.6°F to Celsius
Solution: (98.6 - 32) × 5/9 = 37°C
Problem 3:
Convert 300 K to Celsius
Solution: 300 - 273.15 = 26.85°C
Problem 4:
Convert 0°C to Kelvin
Solution: 0 + 273.15 = 273.15 K
Problem 5:
Convert 25°C to Delisle
Solution: (100 - 25) × 3/2 = 112.5°De
Problem 6:
Convert 100°N to Celsius
Solution: 100 × 100/33 = 303.03°C
Daily Uses of Temperature Conversion
Weather apps display temperature in user preferred units
Cooking recipes require oven temperature conversions
Medical thermometers show body temperature in different scales
HVAC systems control room temperature using various units
Scientific experiments require precise temperature measurements
Industrial processes monitor temperature in different scales
Interesting Temperature Facts
Absolute Zero
The coldest possible temperature is -273.15°C or -459.67°F. At this temperature, all molecular motion stops completely. Scientists have never reached true absolute zero.
Body Temperature
Normal human body temperature is 37°C or 98.6°F. This temperature can vary slightly between people and throughout the day. Fever starts around 38°C or 100.4°F.
Room Temperature
Comfortable room temperature is usually between 20-22°C or 68-72°F. This range feels comfortable to most people and is energy efficient for heating and cooling systems.
Water Properties
Water has special temperature points: it freezes at 0°C (32°F) and boils at 100°C (212°F) at sea level. These points change with air pressure.
Cooking Temperatures
Safe cooking temperatures vary by food type. Chicken should reach 74°C (165°F), while beef can be safe at 63°C (145°F) for medium-rare.
Weather Extremes
The hottest temperature recorded on Earth was 54.4°C (129.9°F) in Death Valley. The coldest was -89.2°C (-128.6°F) in Antarctica.
Frequently Asked Questions
How do I convert Celsius to Fahrenheit?
To convert Celsius to Fahrenheit, multiply the Celsius temperature by 9/5 (or 1.8) and then add 32. For example: 25°C × 9/5 + 32 = 77°F. You can also use our temperature converter for instant results.
What is the difference between Celsius and Kelvin?
Celsius and Kelvin use the same degree size, but they start at different points. Kelvin starts at absolute zero (-273.15°C), while Celsius starts at the freezing point of water (0°C). To convert: K = °C + 273.15.
Why do some countries use Fahrenheit instead of Celsius?
The United States, Bahamas, and a few other countries still use Fahrenheit because they adopted it before the metric system became standard. Most of the world uses Celsius as part of the metric system.
What temperature scale do scientists use?
Scientists typically use Kelvin for scientific calculations because it starts at absolute zero. This makes mathematical calculations easier and more accurate. Celsius is also common in scientific work outside of physics.
How accurate is this temperature converter?
Our temperature converter uses precise mathematical formulas and provides results accurate to 8 decimal places. The calculations are based on official temperature conversion standards used worldwide.
Can I convert negative temperatures?
Yes, you can convert negative temperatures in all scales except Kelvin and Rankine, which start at absolute zero. Negative Celsius and Fahrenheit temperatures are common in cold weather and scientific applications.
What are the less common temperature scales used for?
Delisle, Newton, Réaumur, and Rømer are historical temperature scales. They were used before Celsius and Fahrenheit became standard. Today, they are mainly used in historical research or specialized scientific applications.