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Temperature Conversion: Celsius to Fahrenheit Simplified

Temperature conversion is a practical skill that many people find useful in their daily lives, particularly when traveling or dealing with different measurement systems. One of the most common conversions is between Celsius and Fahrenheit, two widely used temperature scales. In this article, we will discuss the basics of temperature conversion, with a focus on understanding the relationship between Celsius and Fahrenheit and how to convert between the two.

The Celsius scale, named after Swedish astronomer Anders Celsius, is a popular temperature scale used predominantly in most countries around the world. On the other hand, the Fahrenheit scale, developed by German physicist Daniel Fahrenheit, is primarily utilized in the United States. These two temperature scales have different starting points and units of measurement, which can make converting between them appear daunting at first. However, with the help of a simple formula, this task can become much more manageable.

To convert a temperature in Celsius to Fahrenheit, one can use the formula: °F = (°C × 1.8) + 32. Inversely, to convert a temperature in Fahrenheit to Celsius, the formula is: °C = (°F – 32) × 5/9. By understanding these conversion formulas and practicing the calculations, anyone can adeptly switch between Celsius and Fahrenheit with ease.

Thermometer with a double graduation degree centigrade and degree fahrenheit on a sunny sky background

Celsius and Fahrenheit Scales


The Fahrenheit scale, invented by Daniel Gabriel Fahrenheit in 1724, is a commonly used temperature scale in the United States, the Bahamas, Belize, and the Cayman Islands. It uses degrees Fahrenheit (°F) as its unit. The Fahrenheit scale sets the freezing point of water at 32 degrees and the boiling point at 212 degrees. Therefore, the difference between the boiling and freezing points in the Fahrenheit scale is 180 degrees. Absolute zero is defined as -459.67°F.

Body temperature is also measured in degrees Fahrenheit in these regions, with the normal body temperature being around 98.6°F.


The Celsius scale, invented by Anders Celsius in 1742, is an SI (Système International) derived unit for temperature measurements. It uses degrees Celsius (°C) as its unit. The Celsius scale was based on the freezing point of water, set at 0 degrees Celsius, and the boiling point of water, set at 100 degrees Celsius. This temperature scale is widely used across the world, apart from the aforementioned countries using the Fahrenheit scale.

When it comes to body temperature, the Celsius scale also sets the normal body temperature at around 37°C.

In scientific contexts, the Kelvin scale is often preferred for temperature measurements. There is a direct relationship between Celsius and Kelvin, with one degree Celsius being equal to one Kelvin, and a simple conversion: K = °C + 273.15.

Conversion between Celsius and Fahrenheit

To convert a temperature in Celsius to Fahrenheit, the following formula can be used:

°F = (°C × 9/5) + 32

Conversely, to convert a temperature in Fahrenheit to Celsius, the formula is:

°C = (°F – 32) × 5/9

In addition to these two temperature scales, there are others that are used in specialized fields, such as the Rankine scale, used primarily in thermodynamics.

For handling electric and power conversions, the SI system utilizes units such as kilogram, meter, and second (also known as the metric system). This system is widely accepted and used internationally, though the United States is an exception for some units.

When discussing temperature, it is essential to distinguish between temperature in Celsius and temperature in Fahrenheit, as the difference in these scales can lead to misunderstandings and potential errors in scientific and everyday contexts.

Converting Celsius to Fahrenheit

When working with temperature measurements, it is sometimes necessary to convert between Celsius and Fahrenheit. This section will help readers understand the process and provide useful formulas and conversion tables for reference.


To convert Celsius to Fahrenheit, the following formula can be used:

°F = (°C * 1.8) + 32

In this formula, °C represents the temperature in Celsius, and °F represents the temperature in Fahrenheit. By multiplying the Celsius temperature by 1.8 and then adding 32, one can quickly calculate the corresponding Fahrenheit temperature.

For example, to convert 20 degrees Celsius to Fahrenheit:

°F = (20 * 1.8) + 32
°F = 36 + 32
°F = 68

So, 20 degrees Celsius is equal to 68 degrees Fahrenheit.

Conversion Table

For convenience, below is a conversion table showcasing some common Celsius to Fahrenheit conversions:


Through the use of the formula and conversion table provided, readers should be able to efficiently convert Celsius temperatures to their Fahrenheit equivalents. Remember that accurate conversion is essential for various scientific, meteorological, and everyday applications.

Celsius to Fahrenheit Calculation


To convert Celsius to Fahrenheit, the first step is to multiply the temperature in Celsius by 1.8 (or 9/5). For instance:

T(°F) = T(°C) × 1.8

Divide by

There is no division step in the Celsius to Fahrenheit conversion process. The formula only involves multiplication and addition, as described in the “Multiply” and “Add” subsections.


There is no need for subtraction in the Celsius to Fahrenheit process, but it’s worth noting that this operation is used in the inverse conversion, i.e., from Fahrenheit to Celsius:

T(°C) = (T(°F) - 32) x (5/9)

Using a Calculator

To complete the Celsius to Fahrenheit calculation, use a calculator or an online tool to perform the operations mentioned in the “Multiply” and “Add” subsections. Here’s how the conversion looks with an example:

  1. Multiply the Celsius temperature by 1.8.
  2. Add 32 to the result.

Taking 15 °C as an example:

  1. 15 °C × 1.8 = 27
  2. 27 + 32 = 59 °F

So, 15 °C is equivalent to 59 °F.

Common Temperature Comparisons

In this section, we will discuss several common temperature comparisons in both Celsius and Fahrenheit. These comparisons include absolute zero, the freezing point of water, average body temperature, the boiling point of water, and room temperature.

Absolute Zero

Absolute zero is the lowest temperature possible in the universe, where all molecular movement stops. It is:

  • -273.15 °C
  • -459.67 °F

Freezing Point of Water

The freezing point of water is the temperature at which water transitions from a liquid to a solid state. It is:

  • 0 °C
  • 32 °F

Average Body Temperature

The average body temperature of a healthy human is the temperature at which our body performs its functions most efficiently. It is:

  • 37 °C
  • 98.6 °F

Boiling Point of Water

The boiling point of water is the temperature at which water transitions from a liquid to a gas state. It is:

  • 100 °C
  • 212 °F

Room Temperature

Room temperature is typically defined as the comfortable ambient temperature at which most people feel relaxed. It usually ranges between:

  • 20 °C to 25 °C
  • 68 °F to 77 °F

These examples help visualize different temperature scales and understand the relationships between the Celsius and Fahrenheit temperature units. Converting between these units involves the following formulas:

  • Celsius to Fahrenheit: (°C × 1.8) + 32 = °F
  • Fahrenheit to Celsius: (°F – 32) / 1.8 = °C