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Accurate
Documented formulas, consistent constants and worked examples make every result easier to check.
About CountMaterials / Built for the real number
Construction calculators
The number you need, not just the formula.
CountMaterials turns dimensions into practical material estimates — cubic yards, bags, tons, linear feet and estimated cost — so you know what to order before you make the call.
Free • No account required • USA focused
FIG. 01 / MATERIAL TAKEOFF
COUNT / CALCULATE / ORDER
10′-0″
10′
4″
Est. concrete1.36 yd³
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Practical
We take the extra step from volume to bags, ready-mix quantities and useful order estimates.
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Independent
No supplier affiliation. No account required. Calculations run directly in your browser.
Why we built it
Most calculators stop too early.
Someone asks how much concrete they need for a 10×10 patio. A typical calculator gives them 1.36 cubic yards — and leaves the next decision unanswered.
CountMaterials was built to bridge that gap. The goal is simple: turn measurements into information people can actually use when buying materials.
We build each calculator around real construction units and show the assumptions behind the estimate instead of hiding the math.
Worked example — 10 × 10 slab, 4 in, 10% waste
10 × 10 × (4 ÷ 12) = 33.33 ft³
Order-ready estimate1.36 yd³
The process
From dimensions to a real order.
01
Enter
Enter the dimensions and job-specific inputs you already know.
02
Calculate
The calculator converts your measurements using the relevant construction formula.
03
Order
Use the result to compare bags, ready-mix, tons or other material quantities.
Trust / transparency
Built for real-world estimates.
Browser based
Calculations happen locally in your browser. No account is needed.
No supplier affiliation
We are an independent calculator site, not a materials supplier.
Estimates, clearly labeled
Material prices and quantities are estimates and can vary by location.
Verify local requirements
Always check local codes, manufacturer instructions and professional requirements where applicable.
Sources & methodology
Show the work.
Every calculator has a documented method, assumptions and worked example. Detailed formulas and reference material live on the dedicated Methodology page so this About page stays focused.
View methodology →Construction reference dataDocumented
Manufacturer bag yieldsReference
Relevant ASTM / ACI guidanceReference
Industry material weightsReference
Found something wrong?
Report a calculation issue and we’ll review the formula, units or assumptions.