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Short, practical explainers grounded in the same math our calculators use so you understand the numbers, not just the results.
How many yards of concrete do you need for a slab? Length × width × thickness ÷ 27 gives cubic yards — then add waste and choose ready-mix or bags.
How many concrete blocks per square foot? Block counts, mortar bags, core-fill grout, and bond-beam rebar — the four quantities every block wall estimate needs.
How many bundles of shingles per square? A 6/12 roof has 11.8% more surface than its footprint — pitch multipliers, squares, and waste explained.
How do you calculate stairs? Riser count = total rise ÷ 7.5, treads = risers − 1, and the three IRC numbers every stair must satisfy.
What is the difference between markup and margin? A 30% markup is only a 23% margin — price from margin, not markup, or the job's profit quietly disappears.
What is a material takeoff in construction? Net is what the building needs, waste is what the jobsite eats, and order quantity is what the supplier sells.