this page seriously undersells the versatility and utility of the units program

how long will my laptop take to charge at its current rate of charging?

    You have: (22.8 Wh - 16.8 Wh)/7.4W
    You want: time
            48 min + 38.918919 sec

how thick of a cable do i need to support me (or, from a different point of view, to pose a risk of accidental strangulation)? suppose its tensile strength is 2.7 gigapascals

    You have: 120kg gravity / 2.7 GPa
    You want: mm2
            * 0.43585111
            / 2.2943615
    You have: _
    You want: circlearea
            0.00037247244 m
    You have: _
    You want: mm
            * 0.37247244
            / 2.6847624

note that this is the radius of the cable, not its diameter!

(to be continued)