Materials, quantities, and the arithmetic of a job site. Volumes, bag counts, and estimates worked out before the truck arrives.
Work out concrete volume in cubic yards or metres for slabs, footings, columns, stairs and curbs.
Work out how many tons or cubic yards of gravel you need from area and depth, with coverage per ton, bag counts and cost, or solve back from a budget.
Find how many cubic yards or 2-cubic-foot bags of mulch you need from bed area and depth, with coverage and bulk-vs-bag cost, or solve back from a budget.
Work out how many gallons of paint you need from wall area, coats and coverage, minus doors and windows, or solve back from the paint you already have.
Find how many tiles and boxes you need from room area and tile size, with a waste allowance and cost, or work back from the boxes you have.
Estimate roof size in squares and shingle bundles from footprint and pitch, with waste and cost, or work back from the bundles you already have.
Calculate board feet of lumber from thickness, width and length for any number of boards, with cost per board foot, or solve back from a budget.
Find how many drywall sheets you need from wall and ceiling area, plus screws, joint compound and tape, or work back from the sheets you have.