Estimate Concrete for Tempe Slabs, Driveways, Patios & Footings
Use this Concrete Calculator in Tempe to estimate cubic yards, cubic feet, ready-mix volume, bags and optional material cost for concrete projects in Tempe. Calculate rectangular slabs, patios and driveways, continuous footings, round pads and piers, or convert a known volume into bags and truck-load planning.
Calculate slabs and driveways, continuous footings, round pads/piers, or convert known concrete volume into bags and ready-mix planning quantities.
Estimate concrete for a rectangular slab using length, width, thickness and allowance.
Quantity estimate only. Slab thickness, reinforcement, base preparation, joints, drainage and concrete specification must match the actual Tempe project requirements.
Estimate rectangular footing or grade-beam concrete from continuous length, width and depth.
Estimate cylindrical concrete volume from diameter, depth/thickness and quantity.
Start with known concrete volume and estimate bags, ready-mix truck equivalents and optional cost.
Verify the exact bag's published yield
Start by choosing the geometry that matches the concrete you plan to place. A patio, driveway section or slab is usually calculated as a rectangular prism. A continuous footing or grade beam is calculated from length, width and depth. A round pier or pad uses the cylinder formula. If a contractor or supplier already gave you a volume, use the bags and ready-mix mode to convert that volume into ordering quantities.
The calculator first determines exact geometric volume. It then applies the selected planning allowance. The allowance is not a structural design factor; it simply helps account for uneven grade, form variation, small spills and the fact that actual field dimensions rarely match perfect geometry.
Use the average concrete thickness actually intended for the placement.
Calculate stepped or varying footing sections separately when dimensions change.
Diameter and depth are converted from inches to feet before calculating cubic yards.
Estimate concrete volume for rectangular driveway sections and extensions.
Calculate backyard patios, shed slabs, equipment pads and general flatwork.
Estimate continuous concrete for additions, walls and foundation elements.
Convert adjusted cubic yards into editable truck-equivalent and cost estimates.
For most residential flatwork, the key inputs are length, width and average thickness. A 20 ft × 12 ft slab contains 240 square feet. At 4 inches thick, the exact volume is 80 cubic feet or about 2.96 cubic yards. With a 10% planning allowance, the calculator shows approximately 3.26 cubic yards.
That same formula can be used for a Tempe patio, walkway section, concrete pad or a rectangular driveway panel. If the project has several areas with different thicknesses, calculate each area separately and add the adjusted results rather than forcing one average thickness across the entire job.
Driveways often contain multiple geometric sections: the main parking area, a narrower approach, flared corners or an extension beside an existing driveway. Divide the layout into rectangles, calculate each one and add the cubic yards. This produces a more reliable takeoff than multiplying the longest overall length by the widest overall width.
Do not let an online material calculator choose driveway thickness or reinforcement for you. Those details depend on vehicle loading, subgrade, base, drainage, joints, existing conditions, project design and any local requirements that apply to the work.
A backyard patio is usually straightforward to measure, but small dimensional errors can still change the order. Measure the formed dimensions after layout when possible. If the patio has a step, thickened edge, footing for a cover or isolated equipment pad, calculate those volumes separately.
For decorative concrete, stamped concrete or exposed-aggregate work, the volume formula stays the same. Decorative finish does not reduce the quantity of base concrete required.
The footing mode converts continuous length, width and depth into cubic yards. For example, 100 linear feet of footing that is 18 inches wide and 12 inches deep contains 150 cubic feet, or about 5.56 cubic yards before allowance.
Actual foundation dimensions should come from the approved project documents where required. Do not use a calculator to choose footing width, depth, reinforcement or bearing requirements.
Round piers are calculated as cylinders. A 24-inch-diameter pier has a radius of 1 foot. If it is 36 inches deep, one pier contains π × 1² × 3 = about 9.42 cubic feet, or roughly 0.35 cubic yard before allowance. Multiple identical piers are multiplied by the entered quantity.
This mode can also be used for round equipment pads, sign bases or other cylindrical concrete elements when the geometry is reasonably uniform.
Perfect geometric volume assumes perfectly shaped excavation, perfectly straight forms and no material loss. Real placements can differ. Many estimators add a modest project allowance and then coordinate the final order with the ready-mix supplier.
This calculator provides 0%, 5%, 10%, 15% and 20% options. The appropriate amount depends on the certainty of the dimensions, excavation quality, project size and ordering increments. A large arbitrary allowance is not automatically better because excess ready-mix can create disposal and cost problems.
Bagged concrete can be practical for small repairs, isolated posts, tiny pads or projects where a ready-mix truck cannot access the placement. Bag yield varies by product and bag size, so the calculator keeps yield per bag editable.
Ready-mix is usually easier to plan for larger placements. The usable truck capacity field is editable because truck payload and supplier policies can differ.
Concrete permit requirements in Tempe depend on the project scope, property conditions and whether work affects a building, private development, drainage system or public right-of-way. Tempe Building Safety reviews plans and permit applications, while Private Development Engineering shares responsibility for City rights-of-way and onsite drainage through civil plan review.
New homes, additions, renovations and accessory structures require plan approval before permits can be issued under Tempe's residential plan-review process. A patio slab, driveway extension, foundation or other concrete project can follow a different path depending on its structural role and location, so verify the exact permit requirements before scheduling ready-mix delivery.
The City of Tempe reports that an updated construction code package was adopted June 4, 2026, moving the community from its previous 2018 code cycle toward adopted 2024 construction codes. Tempe's Building Safety resources cover the IBC, IRC, energy, mechanical, plumbing, fire and related codes together with local amendments and administrative requirements.
Because code-transition details can affect which edition applies to a particular application, confirm the applicable code set with the Tempe Permit Center for the project date and permit type. Structural slabs, footings, foundations, additions and new buildings should follow approved plans for slab thickness, reinforcement, footing geometry, structural capacity and inspections. This calculator estimates material volume only.
Tempe's Private Development Engineering team lists a Paving (PV) permit covering bus shelters, curbs, ramps, sidewalks and driveways within the right-of-way. The team also reviews drainage, sewer, water, fire-line and other civil work tied to private development.
For estimating, measure the private driveway slab separately from any curb, ramp, sidewalk or public-side driveway section when dimensions differ. For construction, use the approved civil plans and the permit requirements that apply to the right-of-way portion rather than treating all concrete as ordinary private flatwork.
Tempe Engineering states that public right-of-way includes streets, sidewalks and buffer areas between property lines and sidewalks. Under City Code Section 29-19, public right-of-way encroachments require a valid permit or license, depending on the type and permanence of the encroachment.
If a concrete project affects sidewalks, curb areas, drainage facilities, utility zones, street paving or other City right-of-way, calculate those sections separately from the private slab. Tempe's Private Development Engineering and Public Works Engineering requirements can add plan review, permitting, inspection, restoration and drainage conditions.
Concrete quantity should be based on the finished form and excavation geometry. Low spots increase concrete volume; high spots can reduce thickness. Proper base and drainage design also matter for performance, especially around driveways, patios and areas adjacent to buildings.
Measure after forms are set when possible. If the subgrade varies significantly, use field measurements or break the project into sections. Avoid assuming that every point beneath a slab is exactly the same depth.
A private driveway slab and the portion within City right-of-way should be estimated separately when the geometry or permit requirements differ. Tempe Private Development Engineering specifically includes driveways, sidewalks, curbs and ramps within the scope of its Paving permit for private development.
For quantity estimating, calculate the private driveway, approach, sidewalk panels, curb-related work and pavement restoration as separate sections. For construction, follow the approved Tempe engineering plans, right-of-way requirements and current standard details for the public portion.
Tempe concrete placements frequently require hot-weather planning. High concrete and ambient temperatures, direct sun, low relative humidity and wind can increase evaporation and shorten the time available for placing and finishing. The concrete supplier and contractor should coordinate mixture temperature, delivery timing, placement sequence and curing for the actual conditions.
A volume calculator cannot compensate for poor hot-weather logistics. For a larger driveway, patio or slab, plan how quickly trucks can discharge, whether a pump or other placement method is needed, and how curing will begin after finishing. Do not change water or admixture dosage without following the approved concrete mixture and supplier instructions.
Tempe Public Works Engineering publishes Engineering Design Criteria and the Tempe Supplement to the Maricopa Association of Governments uniform standard details and specifications. The City's Standards & Details page currently lists Engineering Design Criteria updated July 19, 2024, along with standard plan sheets revised into 2026.
These public-infrastructure standards should not be used as a substitute for approved private structural design. Where a project affects City paving, curb, sidewalk, drainage or utility infrastructure, use this calculator for quantity takeoff and the current Tempe standard detail and approved plan for construction.
Tempe's Private Development Engineering team explicitly shares responsibility for onsite drainage and reviews retention basins, underground retention, storm pipes, catch basins and shoring under its Drainage permit category. That makes drainage planning important for larger slabs, driveways and development paving: adding concrete can change runoff paths and reduce infiltration area.
Measure concrete only after the approved site geometry is known. Keep drainage features, slopes, utility conflicts and required landscape or setback areas out of the pour quantity unless they are intentionally part of the permitted concrete work.
Measure the slab, footing or pier geometry, calculate exact cubic yards, then apply a realistic ordering allowance.
Common questions about cubic yards, driveways, patios, footings, bags, ready-mix and concrete planning in Tempe.