CalcWorks
Crew pouring and screeding a concrete slab from a mixer truck in evening light

Construction & Home-Improvement Calculators

Free, instant calculators for lumber, concrete, paint, tile, fencing and more — each one shows its formula, a worked example and a reference chart, so you can check the math before you buy materials.

10 free calculators Answers as you type No sign-up, ever
10×10 ft slab → 1.36 yd³ of concrete 2×8×8 board → 10.67 board feet 6/12 roof → 26.57° angle

Tap the job site — the picture is the menu

Most calculator sites hand you a wall of blue links and leave you to guess. Here, just tap the part of the job you are working on — the photo takes you straight to its calculator.

Aerial view of carpenters framing the walls of a new house Framing lumber Wall sheets Floor area
Inside a house being framed — tap a marker
Mixer truck pouring a concrete slab while the crew screeds it level The slab Formwork boards Graded ground
Pour day on a real site — tap a marker
New: one project, one list. Real jobs need more than one calculator — a patio needs concrete and gravel and lumber for the forms. So every calculator below now has an “Add to Project List” button: work through your job, and everything lands on one shopping list with a single running total.

All 10 calculators

Why trust these numbers?

Every calculator on CalcWorks is built from the same formulas and published data the trade itself uses — lumber tally rules from the NHLA, bag yields from the QUIKRETE technical data sheet, aggregate densities from quarry and DOT tables, and standard framing geometry. Each page prints its formula, works a full example with real numbers, and lists its sources, so nothing here is a black box: if a figure matters to your project, you can verify it by hand from the page itself.

Results are planning estimates. Material sizes, local material densities and site conditions vary, so confirm final quantities with your supplier or contractor before ordering.

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