Temperature Converter
Convert between Celsius, Fahrenheit, Kelvin, and Rankine instantly with formula display and all-unit results.
Convert Temperature
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How to Use the Temperature Converter
- Type the temperature value you want to convert in the input field.
- Choose the source temperature unit from the From dropdown — Celsius, Fahrenheit, Kelvin, or Rankine.
- Choose the target temperature unit in the To dropdown.
- Click the Convert button to see the result instantly along with the conversion formula used.
- See the entered temperature converted to all four units simultaneously below the main result.
- Use the Swap button to reverse units or Clear to reset everything for a new conversion.
Key Features of This Temperature Converter
Four Temperature Scales
Convert between Celsius, Fahrenheit, Kelvin, and Rankine — all major temperature units supported.
Formula Display
Every conversion shows the exact formula used so you can learn and verify the calculation.
Instant Swap
Quickly reverse the From and To units with one click to convert in the opposite direction.
All-Unit Results
See your temperature converted to all four scales simultaneously for quick comparison.
100% Private
All conversions happen in your browser. No data is stored, sent, or tracked anywhere.
Mobile Friendly
Fully responsive design works perfectly on smartphones, tablets, and desktop computers.
Temperature Conversion Formulas
All temperature conversions in this tool use standard scientific formulas. Here are the key conversion formulas between the four supported temperature scales.
°F = (°C × 9/5) + 32
°C = (°F − 32) × 5/9
Celsius ↔ Kelvin:
K = °C + 273.15
°C = K − 273.15
Fahrenheit ↔ Kelvin:
K = (°F − 32) × 5/9 + 273.15
°F = (K − 273.15) × 9/5 + 32
Celsius ↔ Rankine:
°R = (°C + 273.15) × 9/5
°C = (°R × 5/9) − 273.15
Fahrenheit ↔ Rankine:
°R = °F + 459.67
°F = °R − 459.67
Kelvin ↔ Rankine:
°R = K × 9/5
K = °R × 5/9
The Kelvin and Rankine scales are absolute scales starting from absolute zero. Celsius and Fahrenheit are relative scales. One Kelvin increment equals one Celsius degree, while one Rankine increment equals one Fahrenheit degree.
Practical Temperature Conversion Examples
Example 1: Normal Body Temperature (India)
Input: 37°C (standard body temperature measured in Indian hospitals)
Result: 98.6°F | 310.15 K | 558.27°R
Indian doctors commonly use Celsius, but many patients are familiar with the Fahrenheit reading of 98.6°F as the normal body temperature.
Example 2: Summer Heat in Delhi
Input: 45°C (peak summer temperature in Delhi, India)
Result: 113°F | 318.15 K | 572.67°R
Delhi summers regularly touch 45°C. Converting to Fahrenheit gives 113°F, which helps international visitors understand the intensity.
Example 3: Boiling Point of Water
Input: 100°C (water boils at sea level)
Result: 212°F | 373.15 K | 671.67°R
The boiling point of water at standard atmospheric pressure is one of the most commonly used reference points in temperature conversion.
Example 4: US Winter Temperature
Input: 14°F (cold winter day in New York, USA)
Result: −10°C | 263.15 K | 473.67°R
Americans use Fahrenheit daily. When 14°F is converted, it reveals a temperature of −10°C — quite cold by Indian standards.
What Is a Temperature Converter?
A temperature converter is a tool that translates temperature readings between different measurement scales. The most commonly used scales worldwide are Celsius and Fahrenheit. Scientists and engineers also frequently use Kelvin and Rankine for thermodynamic calculations.
Temperature conversion is essential in everyday life, science, cooking, medicine, weather forecasting, and engineering. In India, Celsius is the standard unit used by the Indian Meteorological Department (IMD), hospitals, and schools. In the United States, Fahrenheit remains the primary unit for weather reports and daily use.
This temperature converter handles all four major scales and shows you the exact formula used for each conversion. Whether you are a student solving physics problems, a traveller checking weather in a different country, or an engineer working with thermodynamic data, this tool gives you instant and accurate results.
📖 Want to learn more about temperature scales and conversion techniques?
Read Our Complete Temperature Guide →Common Temperature Reference Points
| Reference Point | °C | °F | K | °R |
|---|---|---|---|---|
| Absolute Zero | −273.15 | −459.67 | 0 | 0 |
| Water Freezes | 0 | 32 | 273.15 | 491.67 |
| Room Temperature | 25 | 77 | 298.15 | 536.67 |
| Body Temperature | 37 | 98.6 | 310.15 | 558.27 |
| Water Boils | 100 | 212 | 373.15 | 671.67 |
Frequently Asked Questions
Yes, this temperature converter is completely free. No signup, no login, and no usage limits. Convert as many temperatures as you need.
This tool supports four temperature scales: Celsius (°C), Fahrenheit (°F), Kelvin (K), and Rankine (°R). You can convert between any combination of these units.
Multiply the Celsius value by 9/5 and add 32. The formula is °F = (°C × 9/5) + 32. For example, 37°C = (37 × 9/5) + 32 = 98.6°F.
Subtract 32 from the Fahrenheit value and multiply by 5/9. The formula is °C = (°F − 32) × 5/9. For example, 98.6°F = (98.6 − 32) × 5/9 = 37°C.
Absolute zero is the lowest possible temperature: 0 K (Kelvin), −273.15°C, −459.67°F, and 0°R (Rankine). No temperature can go below this point.
No. All conversions happen entirely in your browser. No data is stored, saved, or sent to any server. Your information is completely private.
Yes, you can enter negative values for Celsius and Fahrenheit. However, Kelvin and Rankine cannot be negative as they start from absolute zero. The tool validates this automatically.
Kelvin and Celsius have the same increment size — a 1-degree change in Celsius equals a 1-degree change in Kelvin. The difference is the starting point: 0 K = −273.15°C. To convert, add 273.15 to Celsius to get Kelvin.
Rankine is an absolute temperature scale used primarily in thermodynamics and engineering, especially in the United States. It starts at absolute zero like Kelvin but uses Fahrenheit-sized degrees.
Yes. After every conversion, the tool displays the exact formula used along with your input values and the calculated result. This is helpful for learning and verification.
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