How to convert Celsius to Fahrenheit in JavaScript

The two most often used temperature scales are as follows:

• Fahrenheit
• Celsius

Celsius vs. Fahrenheit

Celsius is the world’s most widely used temperature scale, commonly known as Centigrade and written as °C. Celsius is most widely used in scientific and medical applications because it is simpler to work with. Fahrenheit (written as °F) is still commonly used in many everyday applications in the United States.

Celsius to Fahrenheit conversion formula

We can convert the temperature from Celsius to Fahrenheit using the formula below.

$$F = \left(C \times \frac{9}{5} \right) + 32$$

where, $F$ is the Fahrenheit temperature, and $C$ is the Celsius temperature.

Problem statement

We are given a temperature value and need to convert that temperature to Fahrenheit using the above formula.

Explanation

Let’s suppose we have a temperature of $50$ degrees Celsius. Putting the value of $C$ in the above formula,

Given, $C = 50\degree C$.

$$\begin{split} F & = \left(C \times \frac{9}{5} \right) + 32 \\ & = \left(50 \times \frac{9}{5} \right) + 32 \\ & = (50 \times 1.8) + 32 \\ & = 90 + 32 \\ & = 122 \degree F \end{split}$$

Implementation

Let’s see an example of converting the temperature of Celsius to Fahrenheit in JavaScript:

Code explanation

• Lines 1–2: We initialize variables c and f with values 50 and 0, respectively.
• Line 5: We use the formula to calculate the value of f.
• Line 6: We print the value of f to the console.