What are you calculating?
Free construction calculators that answer in two numbers: how much material the job takes, and what it costs where you live. No sign-up, no email, no app.
Most used
- Concrete Slab Cost CalculatorConcrete volume, bag count and slab cost.
- Deck Cost CalculatorDeck material list and cost, framing to railing.
- Fence Cost CalculatorMaterial and installed cost per linear foot of fence.
- Gravel Driveway Tonnage & Cost CalculatorStone tonnage, truckloads and cost for a gravel driveway.
- 12x12 Room Drywall Sheet CalculatorSheet count, mud, tape and screws for a room.
- Paver Patio CalculatorPavers, base stone, bedding sand and cost for a patio.
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How it works
- 1
Answer three questions
How big it is, what it is for, and where the job is. Most answers are buttons — pick "a car parks on it" and the thickness sets itself.
- 2
Read the two numbers
The quantity you order and the cost you should expect, as a range. The buy list underneath is the one you hand to the yard.
- 3
Check what it assumed
Bag yields, waste allowance, spans and prices are printed on the page with their source and the date they were last verified.
Guides & comparisons — the questions people ask before they reach for a calculator: how thick, which material, ready-mix or bags.
Every figure comes from a published source that we name on the page — bag yields from the manufacturer, spans from the code tables, prices from shelf and supplier quotes checked on a schedule. Where a number is soft, the estimate widens instead of pretending to be exact. You can read the whole method on the methodology page.