Temperature Converter - Universal Temperature Unit Conversion Calculator
Convert between 7 different temperature scales instantly. Our free temperature converter tool supports Celsius to Fahrenheit conversion, Kelvin conversions, and more advanced temperature scales. Perfect for weather analysis, scientific calculations, cooking, and engineering applications.
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Enter any temperature value to convert to all temperature scales
Choose the temperature scale you want to convert from
Temperature Conversion Results
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Enter a temperature value and select a unit, then click convert to see all temperature scale conversions.
Temperature Conversion Guide & Formula Reference
What is Temperature Conversion? Understanding Different Temperature Scales
Temperature conversion is the process of converting a temperature value from one scale to another. Different countries and scientific disciplines use different temperature measurement scales. This temperature converter tool allows you to quickly and accurately convert between seven different temperature scales: Celsius (metric standard), Fahrenheit (commonly used in USA), Kelvin (absolute temperature scale used in science), Rankine (engineering scale), Delisle (historical scale), Newton (early temperature scale), and Réaumur (historical European scale). Whether you need to convert Celsius to Fahrenheit for cooking, Kelvin for scientific calculations, or understand historical temperature scales, our temperature unit converter has you covered.
Temperature Scales & Their Applications
- •Celsius (°C)
The metric standard temperature scale. Water freezes at 0°C and boils at 100°C. Used worldwide for everyday temperature measurements, weather forecasts, and most scientific applications.
- •Fahrenheit (°F)
Primarily used in the United States and some Caribbean nations. Water freezes at 32°F and boils at 212°F. Commonly used in weather forecasting, cooking, and household temperature measurements.
- •Kelvin (K)
The absolute temperature scale used in physics and chemistry. 0 K is absolute zero (lowest possible temperature). Water freezes at 273.15 K and boils at 373.15 K. Essential for scientific and engineering calculations.
- •Rankine (°R)
An absolute temperature scale based on Fahrenheit intervals. Absolute zero is 0°R. Used in engineering, thermodynamics, and some technical fields, particularly in aerospace applications.
- •Delisle (°De)
A historical temperature scale created in 1732. Reversed scale where higher temperatures have lower values. Used historically in some European countries.
- •Newton (°N)
One of the earliest temperature scales, created by Isaac Newton. Water freezes at 0°N and boils at 33°N. Historically used but now largely obsolete in favor of modern scales.
- •Réaumur (°Ré)
A historical European temperature scale. Water freezes at 0°Ré and boils at 80°Ré. Mainly of historical interest now, occasionally used in specialized fields.
How to Use the Temperature Converter Tool
Our temperature converter is designed for ease of use. Simply enter a temperature value, select its current unit, and click convert to instantly see conversions to all other temperature scales. Perfect for students, scientists, engineers, chefs, and anyone needing quick temperature conversions.
3 Simple Steps to Convert Temperature
- 1.Enter the temperature value you want to convert in the input field. You can enter decimal values (e.g., 98.6 for body temperature).
- 2.Select the temperature unit or scale of your input value from the dropdown menu (Celsius, Fahrenheit, Kelvin, Rankine, Delisle, Newton, or Réaumur).
- 3.Click the 'Convert Temperature' button to instantly convert your temperature to all seven temperature scales. Copy any result to clipboard or export the data as CSV.
Temperature Conversion Formulas & Mathematical Equations
Understanding the mathematical relationships between different temperature scales is important for accurate conversions. Here are the key formulas used by our temperature converter calculator.
Celsius to Other Scales
°F = (°C × 9/5) + 32 | K = °C + 273.15 | °R = (°C + 273.15) × 9/5
These formulas convert from Celsius (the base scale in our converter) to Fahrenheit, Kelvin, and Rankine respectively.
Fahrenheit to Celsius
°C = (°F - 32) × 5/9
This is the standard formula for converting Fahrenheit temperatures to Celsius. The (-32) removes the offset between scales, and (5/9) adjusts for the different degree sizes.
Kelvin and Absolute Temperature
K = °C + 273.15 | °C = K - 273.15
Kelvin is an absolute temperature scale where 0 K represents absolute zero. The 273.15 offset represents the freezing point of water in Kelvin.
These real-world examples show how our temperature converter instantly displays conversions across all temperature scales for common reference temperatures.
Example 1: Room Temperature Conversion (20°C)
Input: 20°C (comfortable room temperature)
Results: 68°F | 293.15 K | 527.67°R | 150°De | 6.6°N | 16°Ré
Example 2: Body Temperature (37°C - Normal Human Temperature)
Input: 37°C (normal human body temperature)
Results: 98.6°F | 310.15 K | 558.27°R | 111°De | 12.2°N | 29.6°Ré
Example 3: Boiling Point of Water (100°C)
Input: 100°C (boiling point of water at sea level)
Results: 212°F | 373.15 K | 671.67°R | 0°De | 33°N | 80°Ré
Frequently Asked Questions About Temperature Conversion
Find answers to common questions about temperature conversion, temperature scales, and how to use our converter tool.
What is the easiest way to convert Celsius to Fahrenheit?▼
The formula is: °F = (°C × 9/5) + 32. For example, to convert 20°C: (20 × 9/5) + 32 = 36 + 32 = 68°F. Our temperature converter does this calculation instantly - just enter the value and select Celsius as the unit, then click convert.
What is absolute zero and why is Kelvin important?▼
Absolute zero is the lowest possible temperature: -273.15°C or 0 K. Kelvin is the SI unit for temperature in science and uses an absolute scale starting at absolute zero. This makes Kelvin essential for physics, chemistry, and engineering calculations where temperature ratios matter.
When would I use Rankine temperature scale?▼
Rankine is mainly used in engineering, thermodynamics, and aerospace applications in English-speaking countries. It combines the Fahrenheit degree size with the absolute temperature concept of Kelvin. If you work in aerospace engineering or thermodynamic calculations, you may need Rankine conversions.
Why are there so many different temperature scales?▼
Different temperature scales developed historically in different countries and for different purposes. Celsius is metric, Fahrenheit was developed in Germany, Kelvin is the scientific absolute scale, and others like Rankine, Delisle, Newton, and Réaumur are mostly historical. Our converter helps you work with all of them.
Can temperature values be negative in all scales?▼
In Celsius and Fahrenheit, yes - both can have negative values (below freezing). However, in absolute scales like Kelvin and Rankine, temperatures cannot be negative (they start at absolute zero). Delisle, Newton, and Réaumur can also have negative values depending on the reference point.