How to convert Celsius to Fahrenheit in Java

This article will present how to convert temperature from Celsius to Fahrenheit scale and a simple implementation in Java.

The Fahrenheit temperature scale is named for German physicist Daniel Gabriel Fahrenheit and is used primarily in the United States.

The Celsius temperature scale-originally centigrade and later renamed for Swedish astronomer Anders Celsius-is used almost everywhere else in the world.

The formula to convert Celsius to Fahrenheit is:

T_(°F) = (T_(°C) x 9/5 + 32

or

T_(°F) = (T_(°C) x 1.8 + 32

Using this formula, here is a conversion table with common values:

Code

package com.admfactory;

public class ToFahrenheit {

   public static double toFahrenheit(double t1) {
	return t1 * 5/9 + 32;
   }

   public static void main(String[] args) {
	System.out.println("Celsius to Fahrenheit example");
	double t1 = 10d;
	double t2 = toFahrenheit(t1);
	System.out.println(t1 + "°C converts to " + String.format("%2f", t2) + "°F");
	System.out.println();
	double t3 = 140d;
	double t4 = toFahrenheit(t3);
	System.out.println(t3 + "°C converts to " + String.format("%2f", t4) + "°F");
   }
}

Output

Celsius to Fahrenheit example
10.0°C converts to 37.555556°F

140.0°C converts to 109.777778°F