I’ve decided to compile a list of web-based calculators to better help me understand the online calculator market. I hope also that it will help everyone find the best calculator for their needs. I aim to make it as comprehensive and unbiased as possible. I’ll be adding to it as time goes by, but if you have a suggestion, please let me know. Here goes:
General Calculators
This section lists calculators which offer general calculation capabilities. These allow you to simply type any calculation into a free-form text box which they then try to answer.
Calcatraz – My free online calculator offering scientific, unit and currency calculations. Shows workings and a history of previous calculations.
CalculateForFree multiple functions – A calculator script with many functions. This calculator includes different measures conversion, rule of three, temperature conversion and other formulas.
Google calculator – Google will provide answers to calculations entered into the main search box.
Instacalc - The fast, easy shareable online calculator.
Wolfram|alpha – A computational knowledge engine. Enter a query and it uses its built-in algorithms and a growing collection of data to compute the answer.
Task-Specific Calculators
This section is for calculators which provide one specific function (e.g. scientific calculator, tax calculator, etc).
CalculateForFree -Free calculators for home, work and school. The main page offers a basic calculator with links to a wide range of specific calculators including travel, poker odds and global warming calculators.
Calculator.com – Another site with a number of specific calculators, including mortgage, math, loan, finance, scientific, health & sports calculators.
Calculator.net – Claiming to be the richest collection of free online calculators, it offers a large number of specific calculators including mortgage and loan calculators and a number sequence calculator.
Math.com – A collection of specific calculators including trigonometry, probability and finance calculators.
Well that’s it! If you know of a web-based calculator which isn’t on this list, please let me know.
The fast, easy and shareable online calculator.