Construction calculators

Practical site math for home and trade projects.

Paint coverage, tile counts, concrete volumes, and roofing math — with sensible defaults for home projects and trade work.

Calculators

Construction / Rooms

Get the floor area of a rectangular or L-shaped room in any common unit.

basic

18,469 4.7 1 min

Construction / Rooms

Compute the square footage and square metres of a rectangular area from length and width — for floor plans, lots, garden...

basic

17,264 4.6 1 min

Construction / Rooms

Compute the water volume of a rectangular pool from length, width, and average depth, in cubic metres, litres, and US ga...

basic

5,445 4.8 1 min

Construction / Rooms

Plan a straight stair run from the floor-to-floor rise: number of steps, individual riser height, and tread depth that f...

basic

10,288 4.1 1 min

Construction / Rooms

Convert between roof pitch (rise:run), angle in degrees, and rafter length using right-triangle math.

basic

8,699 4.7 1 min

About this category

Paint coverage, tile counts, concrete volumes, and roofing math — with sensible defaults for home projects and trade work.

Missing a calculator in Construction? We'd love to hear what to build next.