In GNU units you can just do:
$ units -t '100 kph / (.956s) / gravity'
2.9629132 $ units -t '100 kph / (.956s) / gravity'
2.9629132 $ qalc -t 100km/h / 0.956s to gee
2.9629132 gees
The reason I recommend it is because it does so much more, I really love this utility since discovering it about a year ago. Example of using time notation combined with uncertainty and unit conversion:
> (18:41 - 09:00+/-00:30) hours * 250 W to kWh
(((1121 / 60) - (9±0.5)) * hour) * (250 * watt) =
approx. (2.4208333±0.125) kW*hWhat I meant to say is that, if one uses a featureful calculator like qalc, then you get unit conversion included without needing two separate utilities. Of course, if you've used a(n obscure) calculator for decades then it may be easier to learn to use a separate unit convertor instead
So, from my viewpoint, qalc is the "separate utility" that I don't need ;-)