I did some instrument flying refresher training the other day with an instructor plus a bunch of (heavy) documentation on-board. Got me thinking about weight & balance. Normally I fly solo so am well within the loading limits of my Scottish Aviation Bulldog, and hence I don't need to check routinely.
Anyway, when I was calculating the loading and checking against the charts and graphs in the Pilots Operating Manual, it struck me that this would be a very good example of a calculation well-suited to a web-app.
So I put one together (see screenshot below) and have published it for general use. You can find it here.
It is free to use. If you register with FlyLogical (also free), you can save (and retrieve) your settings across sessions.
Hope you find it useful.