PQCalc

Quick start

This calculator is able to work with quantities that consist of numbers and units. Give the sample input a try by pressing the "calculate" button

Some more detail

The calculator can correctly calculate, for example, the sum of 4 hours and 30 minutes, and the speed of a vehicle covering 530 km in that time. There is no need to convert units, the calculator does this automatically. If you prefer units in the answer other than the ones chosen by the program, use the "in" command, as in "speed in mi/hr" in the example. If you have trouble with the metric units in the example, define mi as 1.6 km, and convert the speed to miles per hour (see example input).

All the detail

...should be written up in an online manual one day...