Here are some examples how %PN% can be used in different situations. See the full documentation and the list of built in functions for more help.

Basic arithmetics

1 + 1
1 m + 1 in
(1 + 1) / (2 * 5)
3 ^ (45 + 7)
sin 4 / 3

Converting measures, currencies and whatnot

5 cm in ft
100 m + 50 km in mi

Finding out average speed

A car trip of 50 miles that took 80 minutes:

50 mi / 80 min

How long will it take to download a file

750 megabytes on a 1 Mbps download speed:

750 MB / 1 Mbps

How much is it possible to download while you sleep

Assuming the above 1 Mbps and a healthy 8 hours of sleep:

1 Mbps * 8 h