Estimate Concrete for Winston-Salem Slabs, Driveways, Patios, Footings & Foundations
Use this free Concrete Calculator in Winston-Salem to estimate cubic feet, cubic yards, concrete bags, truck loads and editable material cost for residential and commercial concrete projects in Winston-Salem and nearby Forsyth County communities.
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 Winston-Salem-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 Winston-Salem starts with finished concrete dimensions. Measure the actual slab, footing, wall or pad rather than the entire excavation, gravel base or work zone. Select the project type above and enter the dimensions.
The calculator converts cubic feet into cubic yards and applies an optional planning allowance. Small projects can be translated into bag quantities, while larger pours can be checked against 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.
Rectangular slabs use length × width × thickness. If length and width are measured in feet and thickness is entered in inches, divide thickness by 12 before multiplication.
Use finished dimensions for patios, driveway sections, garage floors and other 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 increment.
Driveways and patios are often easy to estimate as rectangular sections. If a driveway widens, contains a parking pad or has changes in thickness, calculate each section separately so the total matches the actual concrete footprint.
| 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 the Rectangular Concrete Calculator for several straight-sided sections.
The Footing & Pad panel estimates square or rectangular footings under posts, columns and other supports. Enter the dimensions of one footing, then multiply by the number of identical footings.
Convert inch-based depth to feet before calculating cubic feet.
Use the Concrete Footing Calculator for dedicated footing geometry. Final footing dimensions and reinforcement should come from the project design.
Straight walls and curbs with constant cross-section can be estimated as rectangular prisms. Multiply total length by height and thickness. Where the dimensions change, calculate each portion separately.
Divide thickness in inches by 12 before multiplying.
Use the Concrete Wall Calculator for wall-specific volume planning.
Small repair areas and isolated pads may be manageable with bagged concrete. Multi-yard slabs can require many bags and mixer cycles, so ready-mix may be more practical for continuous placements.
| 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 and route. Enter the supplier's usable capacity rather than assuming every truck carries the same volume.
The last load may be partial and may have different pricing or minimum-load charges.
For short-load fees and truck spacing, use the Concrete Delivery Calculator.
Ready-mix concrete cost can change with mix, order size, delivery distance, fuel, minimum-load rules and supplier policies. The calculator therefore leaves the local price field editable rather than hard-coding a Winston-Salem price.
Add per-truck delivery fees when applicable. Pumping, labor, reinforcement, finishing and permits are separate.
Concrete work connected to a new house, addition, accessory building, foundation, structural wall or other regulated construction may require permits and inspections through the Winston-Salem/Forsyth County Inspections Division. The City describes the Inspections Division as a City-County agency that reviews plans, issues permits and inspects building, zoning, electrical, mechanical and plumbing work throughout most of Forsyth County.
Single-family building permits for new construction, additions and alterations are submitted through the GeoCivix electronic plan-review system. The City also operates BuildIT for permit searches, inspection comments, permit status, plan-review status and licensed-contractor trade-permit functions.
For permitted work, concrete quantity and inspection readiness should be treated as separate parts of the project. The Winston-Salem/Forsyth County Inspections Division reviews and inspects building work, and licensed contractors can use BuildIT to schedule inspections and review inspection comments and permit status.
Before a footing, foundation wall, structural slab or other regulated concrete element is placed, confirm which inspection stage applies and keep required work accessible. Use the Concrete Pouring Checklist for crew, forms, reinforcement and material preparation, while following the approved plans and inspection requirements.
Winston-Salem concrete projects can experience hot and humid summer conditions, heavy rain, cool winter weather and occasional freezing temperatures. These conditions do not change the geometric volume calculation, but they can affect subgrade condition, placement timing, finishing, curing and protection.
For winter work, use the Concrete Cold Weather Calculator. For hot-weather placement, use the Concrete Hot Weather Calculator where applicable. Keep weather suitability and curing planning separate from the cubic-yard estimate.
Foundation work may contain strip footings, isolated pads, foundation walls, piers and slabs. Estimate each geometry separately instead of applying one average thickness to the entire foundation.
Related tools include the Concrete Foundation Calculator, Concrete Pier Calculator, Concrete Rebar Weight Calculator and Concrete Control Joint Calculator.
Winston-Salem projects can involve sloped lots, older neighborhoods, narrow driveways, wooded properties, active streets and limited truck staging. Before ordering ready-mix, confirm where the mixer can safely stop, whether the truck can reach the discharge point, whether a pump is needed and how quickly the crew can place each load.
For larger pours, coordinate delivery spacing so trucks do not arrive faster than the crew can discharge and finish the concrete. Use the Concrete Delivery Calculator for truck planning and the Concrete Mixer Capacity Calculator for site-mixed batches.
The North Carolina Office of State Fire Marshal currently identifies the 2018 North Carolina Residential Code as the effective residential code. The State has published the 2024 code set, but implementation of the 2024 North Carolina State Building Code was delayed by legislation; applicants should verify the code edition accepted for their permit date with the Winston-Salem/Forsyth County Inspections Division.
This matters because concrete quantity is independent of code edition, while footing size, foundation details, reinforcement, structural requirements and inspection procedures are not. Use this calculator only for material quantity after the project dimensions have been established.
Winston-Salem single-family permit guidance calls for a scaled site plan or survey for common applications such as a new house or addition. The submittal information can include property lines, existing structures, proposed building footprint, decks, porches, garages, dimensions and setbacks.
For concrete estimating, use the dimensions from the approved or final project layout rather than rough lot measurements. This helps keep the slab, footing and foundation quantities aligned with the actual permitted footprint.
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 City requirements.
Answers about Winston-Salem slabs, patios, driveways, footings, delivery, bags, cost, permits and inspections.