Slabs • Patios • Driveways • Footings • Posts
Use this Concrete Calculator in Carrollton to estimate cubic feet, cubic yards, concrete bags and material cost for Carrollton-area slabs, patios, driveways, sidewalks, footings, posts and other concrete projects. Enter your actual dimensions and local material price for a project-specific estimate.
Estimate slabs and patios, continuous footings, round posts/columns, or convert known square footage into bags and ready-mix cost.
Enter finished dimensions for a patio, driveway panel, garage slab, sidewalk section or other rectangular concrete flatwork.
Verify manufacturer bag yield.
Thickened edges, footings, steps and other deeper concrete sections should be calculated separately.
Estimate a uniform continuous footing, grade beam or strip foundation.
Estimate concrete for cylindrical posts, piers and round columns.
Already know the square footage? Convert area and slab thickness into cubic yards, bag quantity and material cost.
The calculator works from geometry, so the first step is measuring the actual concrete dimensions. For a slab, patio or driveway panel, measure finished length and width and enter the planned slab thickness. For a footing, measure total continuous length and use the actual width and depth from the project design. For posts or piers, use the finished diameter and poured height/depth.
After calculating exact volume, compare it with an optional allowance. The allowance is not a mandatory Carrollton percentage—it simply gives you a larger planning quantity to compare against the mathematical volume.
Use finished concrete dimensions.
Slab, footing, round post or area.
Use the project-specific concrete thickness.
Enter an Carrollton-area supplier quote if desired.
Check permits, plans and field dimensions.
For most rectangular slabs, the concrete quantity formula is straightforward.
Cubic yards = cubic feet ÷ 27.
A 20 × 20 foot slab at 4 inches thick contains about 133.33 cubic feet, or approximately 4.94 cubic yards before an ordering allowance.
| Project | Example Size | Thickness | Approx. Concrete |
|---|---|---|---|
| Small Patio | 10 × 12 ft | 4 in | 1.48 yd³ |
| Patio / Slab | 12 × 20 ft | 4 in | 2.96 yd³ |
| Garage Floor | 20 × 20 ft | 4 in | 4.94 yd³ |
| Driveway Section | 20 × 30 ft | 5 in | 9.26 yd³ |
| Large Slab | 30 × 40 ft | 6 in | 22.22 yd³ |
These are geometric examples only. Actual thickness, reinforcement, base preparation and project design can differ.
Location-focused guidance without forcing a single local price.
Calculations use project dimensions rather than broad averages.
Compare bagged concrete for smaller pours.
Estimate cubic yards before requesting a supplier quote.
Slabs are among the most common concrete projects in Central Carrollton, including patios, garage floors, sheds, equipment pads and other flatwork. The slab calculator converts the surface footprint and thickness into concrete volume.
Do not use excavation depth as slab thickness. Excavation can also contain compacted base, drainage layers or other materials. Enter the actual concrete thickness shown on the project plan.
For a dedicated slab page, use the Concrete Slab Calculator. For floor-specific work, use the Concrete Floor Calculator.
For a rectangular patio, multiply length by width to get square footage, then multiply by slab thickness. Irregular patios can be divided into rectangles, circles or other simple shapes and calculated separately.
Use the Concrete Patio Calculator for circular and L-shaped patio geometry.
A driveway estimate should be based on the actual slab footprint and specified thickness. If the driveway has a separate approach, apron, thickened edge or repair section, calculate those parts separately and add the cubic-yard totals.
The City of Carrollton states that a permit is needed when a curb cut is in the public right-of-way, when changes are made to the drive approach, or when a private-property driveway repair or replacement ties into the driveway approach in the right-of-way.
Official resource: Carrollton Driveway / Curb Cuts.
Continuous strip footings and grade beams are calculated from total length × width × depth. The calculator does not size a footing structurally. Soil conditions, loads, building type and code requirements can affect foundation design, so use dimensions from approved plans or qualified design guidance.
For more detail, use the Concrete Footing Calculator or Concrete Foundation Wall Calculator.
Round concrete posts and piers use the cylinder formula π × radius² × height. If the project includes an enlarged footing at the bottom, calculate that footing separately. For larger structural columns, use the Concrete Column Calculator.
Concrete prices can change by supplier, mix specification, delivery distance, order size and additional service charges. Rather than hard-coding a citywide price, the calculator lets you enter a current local quote per cubic yard.
For sealer quantities after the project is ready for treatment, use the Concrete Sealer Coverage Calculator.
The same cubic-yard equations apply in Historic Downtown Carrollton, Castle Hills, Indian Creek, Josey Ranch, Hebron, Frankford and nearby North Dallas communities. What changes are supplier pricing, delivery distance, site access, permit requirements and actual field dimensions.
Use this page for quantity planning, then confirm mix specifications, delivery timing, permit requirements and construction details with the appropriate contractor, supplier, engineer and City department.
Carrollton Building Inspection requires permits for new construction and for certain repair or alteration work. The City's current permit information lists driveways among residential and commercial projects requiring permits and states that foundation repair must be engineered.
Permit applications are handled online through the CityServe portal, with submittal requirements varying by project scope. Use the official Carrollton Permit Information and Submittal Requirements pages before construction.
The City of Carrollton's current Codes & Ordinances page lists the 2024 International Building Code and 2024 International Residential Code among the adopted codes, together with local amendments. Carrollton Fire Rescue also states that the 2024 International Building Code and 2024 International Fire Code are in use.
Because the exact provisions depend on project type, scope and local amendments, use the current Carrollton Codes & Ordinances page before construction.
This Concrete Calculator in Carrollton is a material quantity estimator only. It does not determine structural slab thickness, footing size, reinforcement, foundation design or code compliance.
Use the Slab / Patio mode for driveways, patios, garage floors and walkways. Use the Footing / Grade Beam mode for continuous foundation elements, and the Round Post / Column mode for cylindrical posts or piers. Calculate different shapes separately and combine the final cubic-yard totals.
For larger pours, use the Concrete Truck Count Calculator and Concrete Pump Capacity Calculator for delivery and placement planning.
For warm-season placement, review ACI PRC-305-20 and NRMCA CIP 12. These resources address batching, transport, evaporation, placement, finishing and curing considerations that can matter during North Texas heat.
Concrete streets, bridges, pavement, curbs and other public-infrastructure work should follow approved plans and the applicable agency specifications rather than residential calculator assumptions.
For Texas state transportation work, use the TxDOT 2024 Standard Specifications. TxDOT states that its 2024 specifications apply to construction and maintenance of highways, streets and bridges and were revised for projects letting in Fiscal Year 2025.
The same cubic-yard formulas apply in Historic Downtown Carrollton, Castle Hills, Indian Creek, Josey Ranch, Hebron, Frankford and other nearby communities. What changes are supplier pricing, delivery distance, site access, permit requirements and actual field dimensions.
Use this page for quantity planning, then confirm the mix specification, delivery schedule, permit requirements and construction details with the appropriate contractor, supplier, engineer and City department.
A concrete calculator is mathematically accurate when the entered dimensions match the actual formed or excavated geometry. The biggest estimating errors usually come from incorrect thickness, irregular shapes, uneven excavation or omitted thickened sections—not from the cubic-yard conversion itself.
Re-measure the project immediately before ordering, calculate irregular sections separately and confirm the supplier's minimum-load and delivery policies. A practical ordering allowance can help cover ordinary field variation, but it should not replace accurate measurement.
Carrollton's current retaining-wall guidance states that a permit is required for walls four feet or greater in height, measured from the bottom of the footing to the top of the wall, or for walls supporting a surcharge. It also states that, effective January 1, 2026, retaining walls of any height within four feet of a right-of-way require a permit.
For retaining-wall concrete quantity, calculate the footing and wall separately or use the Concrete Retaining Wall Calculator. Always verify the current permit, engineering and site requirements before construction.
Official resource: Carrollton Retaining Walls.
Concrete quantity comes from finished project dimensions. Weather affects placement and curing procedures, not the basic geometric volume.
Suppose a Carrollton residential slab is 12 feet by 20 feet and 4 inches thick. The area is 240 square feet, and the thickness is one-third of a foot.
With a 10% planning allowance, the calculator shows about 3.26 cubic yards.
Common questions about Carrollton concrete yards, slabs, patios, driveways, bags, cost and permits.