Convert Celsius to Fahrenheit Online

Since I’ve been having lots of visits in my wxWidgets version of the Celsius to Fahrenheit converter, I’ve decided to prepare an online javascript version which lets you easily make the conversion.


GNU GPL v3 Convert Celsius to Fahrenheit Online is licensed under the GNU GPL v3

Here is the complete source code:

<script type="text/javascript">
// *****************************************************************************
// Description: Convert Celsius to Fahrenheit Online by NeoEGM
// Author: Ezequiel Miravalles
// Last modification: 16/08/2009
// URL:
// *****************************************************************************

	Copyright (C) 2009 Ezequiel Gastón Miravalles

	This program is free software: you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation, either version 3 of the License, or
	(at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program.  If not, see <>.

function isNumber(x)
  return ( (typeof x === typeof 1) && (null !== x) && isFinite(x) );	//From

function Round(number, digits)
	return Math.round(number * Math.pow(10,digits)) / Math.pow(10, digits);

function CelsiusToFahrenheit(celsius, fahrenheit)
	var num = celsius.value;
	if (num == "" || !isNumber(Number(num)))
		alert("Please type a number");
		fahrenheit.value=Round((9/5)*num+32, 2);

function FahrenheitToCelsius(fahrenheit, celsius)
	var num = fahrenheit.value;
	if (num == "" || !isNumber(Number(num)))
		alert("Please type a number");
		celsius.value=Round((5/9)*(num-32), 2);

<td><input type="text" name="celsius_field" id="celsius_field" style="width:100px" /></td>
<td><input type="button" value="To Fahrenheit" onclick="CelsiusToFahrenheit($('celsius_field'), $('fahrenheit_field'))" /></td>
<td><input type="text" name="fahrenheit_field" id="fahrenheit_field" style="width:100px" /></td>
<td><input type="button" value="To Celsius" onclick="FahrenheitToCelsius($('fahrenheit_field'), $('celsius_field'))" /></td>

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