Chalk: Construction Calculator

New: AI Advisor! ask how much to order and get answers in your units. Measure once, order right.

Chalk is the construction calculator that speaks your units. Metric first, flawless in feet and inches, and every result shown in both so nothing on site gets lost in translation.

Type measurements the way you say them. The purpose-built keypad takes 5 ft 3 1/2 in one line, with one-tap fraction keys or 2.45 m, or even a mix of both. No more converting in your head, no more decimal-feet guesswork.

THE TOOLBOX • Stairs — risers, going, stringer length, angle and code check • Rafters & Roof — common and hip/valley lengths from span and pitch • Concrete — slabs, footings and post holes, with bag counts • Framing & Studs — stud counts and plate lineal for any wall • Drywall — sheets, screws, compound and tape • Tiling — tiles, adhesive and grout, waste included • Brick & Block — UK, AU and US sizes, plus mortar • Decking — board rows, lineal length and fixings • Board Feet — lumber volume and cost • Equal Spacing & Balusters — even layouts that meet code • Aggregates — gravel, sand, soil and asphalt by volume and tonnes • Running Measurements — layout tables from a start and interval • Chalk Pad — a full-size dimensional calculator with memory and rafter keys • Plus a tape calculator, triangle solver, area & volume, pitch & slope, square check and a full unit converter

ASK THE ADVISOR Chalk's AI Advisor talks the job through — quantities, materials, layout and sequencing. Attach a saved project and it works with your exact numbers. (The Advisor needs a connection; every calculator stays 100% offline.)

BUILT FOR THE SITE • Works fully offline — no signal, no account, no ads • Clear diagram on every calculator • Saved projects keep every number with the job it belongs to • Adjustable fraction precision down to 1/64″ • Rounded, glanceable results you can read in the sun

MADE FOR Carpenters, builders, concreters, bricklayers, renovators and serious DIYers — anywhere metric and imperial meet.

Chalk Pro unlocks all trade calculators and saved projects. Subscriptions renew automatically until cancelled. Estimates only — always verify quantities before ordering.

Privacy: https://chalkcalc.com/privacy Terms: https://chalkcalc.com/terms Support: support@chalkcalc.com