Updates automatically as you type.
Calculated in your browser; your inputs are not sent to us. Privacy
Calculation details
Planning estimate only, not financial, tax, or legal advice. Verify assumptions and current rules before making decisions.
This tool runs in your browser. Your calculator inputs and results are never transmitted to us or to ad/affiliate partners. Ads and sponsored links may set third-party cookies to serve and measure them, but they never receive your calculation values. If you explicitly save a scenario, its permitted fields stay in local browser storage until you clear them. See our Privacy Policy.
Use this result
Share the current inputs or ask ChatGPT to explain the calculation in context.
More options
What does this calculator estimate?
Concrete cost per square foot calculator: price a concrete slab by dimensions, thickness, mix strength, and local rate. Free, editable rates, no signup.
How this calculator works
Frequently asked questions
How does this concrete cost per square foot calculator work?
This concrete cost per square foot calculator runs entirely in your browser , no signup, no data is sent to any server, and nothing is stored or shared. You enter your area dimensions and local concrete pricing, and it instantly calculates an estimated cost per square foot.
Is the concrete cost per square foot calculator free to use?
Yes, this concrete cost per square foot calculator is completely free with no hidden fees, no account required, and no limits on how many times you can calculate.
Can I trust the estimates from this concrete cost per square foot calculator?
The concrete cost per square foot calculator provides a solid ballpark estimate based on the materials and rates you input, but actual costs may vary due to labor, site conditions, and local market rates , always get a professional quote for final budgeting.
Cite this tool
BoringToolsKit. “Concrete Cost Per Square Foot Calculator.” boringtoolskit.com/concrete-cost-per-square-foot/. Free to reference in articles, syllabi, and answer posts with a link.
Privacy: Inputs and results stay in this browser. Any future sponsored recommendation or advertisement will be clearly labeled and kept separate from the calculation.
Worked example: 1,250 sq ft at $6.40 with 8% waste
Set area to 1250, rate to 6.40, waste to 8, thickness to 5. Step 1: 1250 x 6.40 = 8000, the cost of the poured area before overage. Step 2: the waste field becomes a multiplier, 8 / 100 = 0.08, so 1 + 0.08 = 1.08. Step 3: 8000 x 1.08 = 8640. The output reads: Slab cost (5 in): $8,640, then At $6.4/sq ft over 1,250 sq ft + 8% waste. Formatting note: 6.40 prints as 6.4 (2-decimal cap, no zero padding) and 1250 prints as 1,250.
Thickness is a label, not an input. Change 5 to 2 and the total stays $8,640; only the first line changes. The rate must already carry slab depth, so 6 in work must quote higher than 4 in work. A second case: 480 x 7.25 = 3480, then 3480 x 1.12 = 3897.60, printed as $3,897.6. Rounding happens only at display, so no figure is multiplied twice.
Boundary cases the formula accepts silently
At 0% waste you get the raw product: 480 x 7.25 x 1 = 3480. There is no cap, so 300% is accepted and returns 480 x 7.25 x 4 = 13,920. Negatives pass through too: -5% gives 3306, -100% gives exactly 0, and -150% prints as $-1,740, a negative slab cost. Empty fields read as 0: a blank rate returns $0 with no error, and the receipt echoes + -5% waste.
What the total omits is as large as what it includes. Flatwork overage of 5 to 10% covers spillage and a buffer, not form blowout or tear-out. Material cost is thickness-dependent in a way one rate hides: a cubic yard is 27 cubic feet, covering 81 sq ft at 4 in but only 54 sq ft at 6 in. At $145 per yard that is $1.79 against $2.69 per sq ft for identical concrete, a 50% swing the rate must already reflect. Formwork, rebar, labor and delivery minimums sit outside it.