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Volume of rainfall

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Volume of rainfall diagram
The catchment area is multiplied by the depth of rain that falls on it to give the total volume of water produced. Factors such as evaporation, wetting, and soaking into the ground are not considered here.
Catchment area:
Rainfall height:

Water volume:
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Although this calculation is simple in principle, the units can make it a headache. However, CalcTool's unit menus remove this issue, doing all the unit conversion for you.
Here you can easily find how much rainwater you can collect from you roof, how much you need to remove from a courtyard, or how much runoff you can expect from an area of land.