Estimate Concrete for LA Slabs, Driveways, Patios, Footings & Foundations
Use this free Concrete Calculator in Los Angeles to estimate cubic feet, cubic yards, concrete bags, truck loads and editable material cost for residential and commercial concrete projects across the City of Los Angeles.
Choose a slab, footing, wall or delivery/cost calculation and enter your project dimensions.
Estimate concrete for patios, driveways, garage floors, sidewalks and rectangular slabs.
Estimate square or rectangular footings, post bases and isolated foundation pads.
Estimate concrete for straight walls, curbs, raised borders and similar rectangular sections.
Convert known concrete volume into bag quantities, truck loads and an editable material-cost estimate.
Concrete prices, truck capacities, short-load fees and delivery charges vary. Use a current Los Angeles-area supplier quote.
Estimate concrete for driveways, patios and garage floors.
Calculate repeated foundation pads and post-support concrete.
Estimate straight concrete walls, curbs and rectangular sections.
Convert volume into bags, trucks and editable current pricing.
A Concrete Calculator in Los Angeles starts with finished concrete dimensions. Measure the slab, footing, wall or pad itself—not the entire excavation, base material or surrounding work zone. Choose the correct panel above, enter dimensions and calculate the exact geometric volume.
The calculator converts cubic feet into cubic yards and can add a planning allowance. Small pours can also be converted into bag quantities, while larger projects can be checked against mixer-truck capacity and current supplier pricing.
Use finished concrete dimensions.
Choose slab, footing, wall or delivery.
Get cubic feet and cubic yards.
Account for normal field variation.
Confirm supplier, permit and inspection requirements.
For rectangular slabs, multiply length by width by thickness. If length and width are measured in feet and slab thickness is entered in inches, divide thickness by 12 before multiplying.
Use finished dimensions for patios, driveways, garage floors and rectangular flatwork.
A 20-foot by 12-foot slab at 4 inches thick covers 240 square feet. Four inches equals approximately 0.333 foot.
The final ready-mix order may need to be rounded to the supplier's accepted ordering increment.
Driveways and patios are often easy to estimate as one or more rectangles. Widened aprons, parking pads, steps and irregular sections should be measured separately so empty space is not accidentally included.
| Project | Example Size | Thickness | Approx. Exact Volume |
|---|---|---|---|
| Small Patio | 10 × 12 ft | 4 in | 1.48 yd³ |
| Large Patio | 20 × 16 ft | 4 in | 3.95 yd³ |
| Driveway Section | 20 × 10 ft | 5 in | 3.09 yd³ |
| Garage Floor | 20 × 20 ft | 4 in | 4.94 yd³ |
Use the Concrete Slab Calculator for slab-specific estimating and Rectangular Concrete Calculator for multiple straight-sided sections.
The Footing & Pad panel estimates square or rectangular footings under posts, columns and other supports. Enter one footing's dimensions and multiply by the number of identical footings.
Convert depth from inches to feet before calculating cubic feet.
Use the Concrete Footing Calculator for dedicated footing geometry. Final footing dimensions, reinforcement and structural design should come from approved project requirements.
Straight walls and curbs with consistent dimensions can be estimated as rectangular prisms. Multiply total length by height and thickness. Where height or thickness changes, calculate each portion separately.
Divide inch-based thickness by 12 before multiplying.
Use the Concrete Wall Calculator for a wall-specific workflow.
Small repairs and isolated pads may be manageable with bagged concrete, but a multi-yard slab can require many bags and many mixer cycles. The calculator converts cubic feet into approximate 40, 60 or 80 lb bag quantities so you can compare the scale of the job.
| Bag Size | Approx. Yield Used | Bags per yd³ |
|---|---|---|
| 40 lb | 0.30 ft³ | About 90 |
| 60 lb | 0.45 ft³ | About 60 |
| 80 lb | 0.60 ft³ | About 45 |
Verify the actual bag yield on the selected product before purchasing.
Mixer-truck capacity varies by producer, vehicle, route and operating conditions. Enter the usable truck capacity confirmed by your ready-mix supplier.
The final truck may be a partial load and may be priced differently.
For dispatch timing and short-load planning, use the Concrete Delivery Calculator.
Ready-mix pricing can change with mix design, quantity, supplier, delivery distance, fuel, minimum-load rules and other charges. The calculator keeps local price editable rather than hard-coding a Los Angeles rate.
Add delivery fees per truck when applicable. Pumping, labor, reinforcement, finishing, formwork and permit fees are separate.
The Los Angeles Department of Building and Safety (LADBS) manages plan check, permits and inspections for applicable construction in the City of Los Angeles. Its permit guidance recommends checking zoning and property information first, then preparing plans and completing the permit process required for the project.
LADBS also explains that inspections must occur before required work is covered or concealed. Common inspection items listed by the department include foundation excavations and concrete work.
A Los Angeles mailing address does not always mean a property is inside the City of Los Angeles. LADBS specifically advises checking ZIMAS/property information and notes that properties outside the city may require service from another county department.
Before relying on city permit links, confirm the property's actual jurisdiction. This is especially important for foundation, structural, grading or right-of-way work.
Los Angeles concrete placements can experience direct sun, hot temperatures, dry air and wind. These conditions do not change the geometric volume calculation, but they can influence evaporation, placement rate, finishing and curing.
For placement preparation, use the Concrete Pouring Checklist. For temperature-sensitive planning, use the Concrete Hot Weather Calculator where applicable.
Concrete volume and structural design are different tasks. Footings, foundation walls, reinforced slabs, retaining elements and other structural concrete can require project-specific detailing for loads, reinforcement, anchorage and local code requirements.
Use this page only to estimate material after dimensions have been established. For quantity planning after reinforcement is specified, use the Concrete Rebar Weight Calculator.
For concrete design, construction and ready-mix information, consult the American Concrete Institute (ACI) and National Ready Mixed Concrete Association (NRMCA). Final dimensions, thickness, concrete strength, reinforcement and structural details should follow approved project requirements.
Measure the project, calculate cubic yards, add a planning allowance and verify supplier and LADBS requirements.
Answers about Los Angeles slabs, driveways, footings, delivery, bags, cost, permits and inspections.