A good thing to know is that:
100 fpm = 1 knot (roughly). (It comes from the fact that there's about 6000 ft in a nautical mile...)
This can help with calculating required climb RATES to meet missed approach obstacle clearance, as one example.
ie:
Vyse = 120 kts.
You need to make 2.5% gradient.
What RATE of climb (what the performance charts often speak about, and what the instrument tells you) do you / will you require?
2.5% of 120 is 3 kts.
So that's about 300 fpm...
Also,
2 knots = 1 metre per second
ie. halve the number on your ASI (convert to TAS first if significant) to know your speed in mps.
This stuff really should be taught. Maybe it is.
CR.