Slabs • Patios • Driveways • Footings • Posts
Use this Concrete Calculator in Orlando to estimate cubic feet, cubic yards, concrete bags and material cost for Orlando-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 Orlando 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 Orlando-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 Florida, 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 driveway footprint and the specified thickness. If different parts of the driveway have different thicknesses, calculate each section separately.
Driveway work can also involve permitting or engineering review. The City of Orlando's official Engineering Permit Guide states that installing/removing concrete or expanding a driveway can require an engineering permit application. Verify the current requirements for the exact property and scope before construction.
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.
Warm-weather concrete placement requires planning because higher concrete temperature and evaporation can affect handling, finishing and early curing. ACI's hot-weather concrete resources discuss production, delivery, placement, finishing and curing practices intended to reduce hot-weather problems, while NRMCA's CIP 12 explains that high concrete temperature can increase water demand and create other performance concerns.
This calculator does not change concrete volume based on weather. Weather affects construction procedures and timing—not the geometric cubic-yard calculation. For curing scheduling, use the Concrete Cure Time Calculator.
Technical references: ACI PRC-305-20: Guide to Hot Weather Concreting and NRMCA CIP 12: Hot Weather Concreting.
Outdoor concrete planning should account for drainage, site access and the condition of the prepared base. The concrete calculator only determines material volume; it does not design site drainage, slab slope or stormwater systems.
Before ordering ready-mix, verify that forms, reinforcement, access and placement equipment are ready. Sudden changes to the footprint or subgrade elevation can change the concrete quantity even when the original plan dimensions stay the same.
Permit requirements depend on the project. The City of Orlando states that construction and renovation projects require different types of permits and provides an official permit process for applications, plans, status and inspections. Its residential permitting guidance also notes that permits are required for most construction.
Before starting structural slabs, foundations, driveway changes or other regulated work, check the City of Orlando Get a Permit page and the city's Applicable Codes for Permitting page.
The City of Orlando directs users to the Florida Building Commission for the Florida Building Code. Because code editions and supplements change, use the official Florida Building Commission site rather than relying on a static calculator page for the applicable code edition.
This page is a material estimator, not a code-compliance or structural-design tool.
Small repairs and pads may be practical with bagged concrete, while larger slabs, patios and footings can require many bags. The calculator lets you compare approximate bag quantity with ready-mix cubic yards.
Bag yields vary by manufacturer and product. Verify the package yield before purchasing. For larger pours, ready-mix can simplify batching but may include delivery minimums, short-load fees or waiting-time charges.
The exact mathematical quantity assumes uniform thickness, perfect forms and zero placement loss. Real job sites can differ because of uneven base elevations, over-excavation, form tolerance or concrete left in placement equipment.
The calculator's allowance field is optional. Choose the final order based on actual field conditions and supplier guidance.
Concrete is volume, so thickness must be included.
The calculator expects slab thickness in inches and converts it automatically.
Calculate each thickness zone separately.
Add deeper concrete geometry separately.
Enter a current supplier quote instead of relying on an old citywide average.
Check official Orlando permitting information for the exact project scope.
The calculator does not select slab thickness, footing size, reinforcement or concrete strength.
Concrete quantity comes from finished project dimensions. Weather affects placement and curing procedures, not the basic geometric volume.
Suppose an Orlando backyard 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 Orlando concrete yards, slabs, patios, driveways, bags, cost and permits.