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Looking for an online calculator? There are many web-based calculators around with different purposes and capabilities. I’ve sifted through the web to pick out some of the best calculators around. 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 [...]

The qualities of a great web application I aim to make Calcatraz into a great web application. To do so effectively it is important to understand the qualities a great web application exhibits. So what are they? Here are a few things I have thought of: 1. Punctual A web application should be quick: quick [...]

As promised in my last post, I’ve now uploaded the latest version of Calcatraz to the live site. The main feature is a new, hopefully more intuitive and consistent user interface. There are also a number of behind the scenes improvements such as general code tidy-ups. One improvement I’m particularly happy with is the integration [...]

Just a quick update on a few of the things I’ve been working on recently: A new user interface – the old Calcatraz interface has two main pages: the home page with a single calculation entry box, and the main calculation page which shows a history of calculations and other information. One thing I found [...]

Do you lack the time to do the things you really want to? If so, consider whether it might be possible to reduce the time you spend on your current activities to free up some time to use as you please. As someone trying to start a small business, hold down a regular job and [...]

To provide some structure to this site, I will over time be organising my posts into a number of “books”. Each book will be an ordered collection of posts linked to from a master contents page. I’ll use this master page as a place to park ideas for future posts and to ensure comprehensive coverage. [...]

  Calcatraz Quick Start Guide Calcatraz is a free online calculator which offers both basic calculation functionality and more advanced features. This quick start guide gives an overview of some of the things you can do with Calcatraz. Introduction Note: Calcatraz is very new and is still limited in what it can do. However, it [...]

I’ve just implemented currency conversions in the calculator. The rates are updated daily (thanks to Ask Flib for the pointer to suitable data sources). The basic format for carrying out a currency conversion in Calcatraz is to use the three letter country code as in: 10 GBP in USD However, Calcatraz will also accept a [...]

Calcatraz the online calculator now shows workings for the calculations it performs. To view the working for a particular calculation, just enter a calculation into Calcatraz and then click on the ‘Show Working’ button at the bottom right of the answer box, as shown: This will cause the answer box to expand and the working [...]

I’m currently working to improve the range of conversions which can be handled by Calcatraz. Calcatraz now implements the following length / distance conversions: 1 angstrom = 10e-10 metres 1 astronomical unit = 149 597 870 690 metres 1 attometer = 1.0e-18 metres 1 bohr = 5.2918e-11 metres 1 centimeter = 0.01 metres 1 cubit [...]