Construction & Home Calculators

Materials are bought in awkward units: concrete and gravel by the cubic yard, flooring by the box, paint by the gallon, lumber by the board foot. These calculators convert your measurements into the unit a supplier actually sells, and most add a waste allowance because no real job uses exactly the theoretical amount.

The mistakes that cost money are mostly the same across trades. Mixing inches and feet in one calculation, converting cubic feet to cubic yards by dividing by 3 instead of 27, forgetting that a slab with an uneven base takes more concrete than its nominal thickness, and ordering exactly what the maths says and then running short.

Quantities here are planning estimates. Compaction, moisture, product yield and site conditions all shift real requirements, so confirm with your supplier before placing a large order. Structural work, electrical work and anything governed by building code should follow your local code and, where required, a licensed professional.