Estimate how much paint you need based on wall area.
Calculate concrete for a slab, plus cement and sand for a mortar mix ratio.
Calculate how many tiles you need for a room.
Calculate an appliance running cost, or a whole bill including the standing charge.
Work out how many rolls of wallpaper a room needs, with doors and pattern repeat.
Volume, weight, bags and cost of gravel, mulch, soil or sand for an area and depth.
Estimate roof area, shingles, panels or tiles, underlayment and ridge length.
Donaldson R F