The calculators

Three flavours of calculators are provided:
CGI (server-side PHP)
Traditional server-side based calculator. Each recalculation will involve a round-trip to the webserver, which may be very slow dependent on your location and internet connection speed, but this calculator is the most compatible. It does not use any client-side scripting, and has been tested with Links.
Javascript (client-side)
Client-side Javascript-based calculator. The preferred calculator to use if you intend to play around with numbers a lot, but may have compatibility problems with some web browsers.
A downloadable Windows-based calculator intended for off-line use.