Home Calculator Guides
Articles that explain formulas, edge cases, and interpretation for home calculators. Each guide links to the relevant tools so you can apply what you learn.
Jul 22, 2026
Stair Layout: Risers vs Treads, 2R+T Comfort, and the Step-Count Ladder
Layout math is not a building permit. Given total rise and tread depth, count risers, set treads one fewer, check 2R+T comfort, and compare N−1 / N / N+1 pitches on the step ladder before you cut stringers. Verified 36" deck twin included.
Jul 22, 2026
Paint to Buy: Gross Face, Openings Net, and the Can Shelf
Gross wall area is not a shopping list. Subtract openings, multiply by coats, add waste, then round exact gallons up to cans you can actually buy. Verified bedroom twin included.
Jul 22, 2026
Concrete Volume: Net Pour vs Order-With-Waste
Separate the geometry inside the forms from the order ticket. Add a waste allowance, convert yards to bags, and run a patio worked example before you schedule the pour.