How to convert Fahrenheit to Celsius in Java

This article will present how to convert temperature from Fahrenheit to Celsius 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 Fahrenheit to Celsius is:

T_(°C) = (T_(°F) - 32) x 5/9

playing a little with the formula you can have

T_(°C) = (T_(°F) - 32) / (9/5)

or

T_(°C) = (T_(°F) - 32) / 1.8

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

Code

package com.admfactory;

public class ToCelsius {

    public static double toCelsius(double t1) {
	return (t1 - 32) * 5/9;
    }

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

Output

Fahrenheit to Celsius example
10.0°F converts to -12.222222°C

140.0°F converts to 60.000000°C