How to convert Celsius to Fahrenheit in Java

  • 02 November 2017
  • ADM


How to convert Celsius to Fahrenheit in Java - images/logos/java.jpg


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


T(°F) = (T(°C) x 1.8 + 32

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

Celsius (°C) Fahrenheit (°F)
-40°C -40°F
-30°C -22°F
-20°C -4°F
-10°C 14°F
0°C 32°F
10°C 50°F
20°C 68°F
30°C 86°F
40°C 104°F
50°C 122°F
60°C 140°F
70°C 158°F
80°C 176°F
90°C 194°F
100°C 212°F


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");
	double t3 = 140d;
	double t4 = toFahrenheit(t3);
	System.out.println(t3 + "°C converts to " + String.format("%2f", t4) + "°F");


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

140.0°C converts to 109.777778°F