Estimate Concrete for Missouri Slabs, Driveways, Patios, Footings & Foundations
Use this free Concrete Calculator in Missouri to estimate cubic feet, cubic yards, concrete bags, truck loads and editable material cost for residential and commercial projects throughout Missouri.
Choose a slab, footing, wall or delivery/cost calculation and enter the dimensions from your project.
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.
Prices, truck capacities, short-load fees and delivery charges vary by supplier and location. Use a current Missouri-area 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 Missouri starts with the finished dimensions of the concrete itself. Measure the slab, footing, wall or pad—not the entire excavation, gravel base, landscaping border or working area. Select the correct calculator panel and enter the dimensions.
The tool calculates cubic feet, converts the result to cubic yards and applies an optional planning allowance. For small projects it also estimates bag quantities, while the delivery panel helps compare truck loads and 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 and jurisdiction requirements.
For rectangular slabs, multiply length by width by thickness. If the slab is measured in feet but thickness is entered in inches, divide the thickness by 12 first.
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 is approximately 0.333 foot.
The final ready-mix order may need to be rounded to the supplier's accepted increment.
Driveways, patios and garage floors are often rectangular, but widened aprons, parking pads, curves or changes in thickness should be calculated separately. Breaking the project into simple shapes gives a more useful estimate than treating every area as one large rectangle.
| 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 when the project has several straight-sided sections.
The Footing & Pad panel estimates square or rectangular foundations under posts, columns and other supports. Enter the dimensions of one footing, then multiply by the number of identical footings.
Convert depth from inches to feet before calculating cubic feet.
For a dedicated footing workflow, use the Concrete Footing Calculator. Final footing size and reinforcement should come from the project design.
Straight walls and curbs with consistent dimensions can be estimated as rectangular prisms. Multiply total length by height and thickness. Where the section changes, calculate each portion separately.
Divide inch-based thickness by 12 before multiplying.
Use the Concrete Wall Calculator for wall-specific quantity planning.
Small pads, fence-post bases and repairs may be manageable with bags, while multi-yard slabs can require many mixer cycles. The calculator converts volume to approximate 40, 60 or 80 lb bag counts so the scale of the job is easier to compare.
| 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 printed by the selected manufacturer before purchasing.
Ready-mix truck capacity varies by supplier, vehicle and route. Enter the usable truck quantity confirmed by the producer, then divide planned cubic yards by that amount.
The final truck may be a partial load and may be priced differently.
For short-load fees and delivery scheduling, use the Concrete Delivery Calculator.
Concrete prices vary by region, mix, quantity, supplier, fuel, delivery distance and minimum-load policy. A statewide fixed rate can become inaccurate quickly, so the calculator keeps the price-per-yard field editable.
Add per-truck delivery fees when applicable. Pumping, reinforcement, labor, finishing and permits are separate.
Building-code adoption in Missouri can vary by city and county. State law allows communities that otherwise have authority to adopt technical codes by reference, and Missouri statutes also address county building-code and permitting powers in certain classifications.
Because adopted editions and local amendments differ, the most reliable approach is to check the city or county that has jurisdiction over the property before starting regulated work.
Missouri projects can face hot summer conditions, cold winter periods, storms and large seasonal temperature changes. These conditions do not change the geometry of the concrete calculation, but they can affect placement, finishing, curing and protection.
For cold-weather work, use the Concrete Cold Weather Calculator. For general placement preparation, use the Concrete Pouring Checklist.
Foundation projects may contain strip footings, isolated pads, foundation walls, piers and slabs. Estimate each geometry separately and combine the results. Do not apply one average thickness across the whole foundation when the design contains different components.
Related tools include the Concrete Foundation Calculator, Concrete Foundation Wall Calculator, Concrete Pier Calculator and 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 local-jurisdiction requirements.
Answers about Missouri slabs, patios, driveways, footings, delivery, bags, cost and local code checks.