Estimate Concrete for Oregon Slabs, Footings, Walls & Site Work
Use this Concrete Calculator in Oregon to estimate cubic yards, cubic feet, concrete bags, ready-mix truck loads and material cost for slabs, patios, driveways, footings, foundation walls and other concrete projects across Oregon. Enter your actual dimensions and project requirements; the calculator handles quantity math while Oregon-specific code and climate criteria remain site-dependent.
Choose slab/patio, footing, wall, or order-planning mode.
Estimate concrete for a rectangular slab, patio, driveway, basement floor, garage floor or pad.
Use the project-required thickness.
Estimate strip-footing concrete from total length, footing width and footing thickness.
Use approved project dimensions.
Thickness is a design input, not selected by the calculator.
Estimate concrete for a foundation wall, stem wall or retaining-wall section.
Deduct doors or major wall openings when appropriate.
Convert concrete volume into order quantity, truck loads, bags and material cost.
Use the actual planned average load.
Enter an Oregon supplier quote if available.
A Concrete Calculator in Oregon converts project dimensions into concrete volume. The core math is the same whether a project is in Portland, Salem, Eugene, Bend, Medford, Hillsboro, Beaverton, Gresham or another Oregon community. What changes by location is not the cubic-yard formula; it is the project design criteria, weather exposure, frost depth, seismic requirements, drainage, soil conditions, permitting and supplier logistics.
Start by selecting the shape that matches the project. Use the slab mode for patios, garage floors, basement floors and driveway slabs. Use the footing mode for continuous strip footings. Use the wall mode for foundation and retaining walls. Once the net volume is known, use the Order Planner to estimate ready-mix loads or bagged concrete.
Estimate driveways, patios, floors, walkways and equipment pads.
Calculate strip-footing volume from approved length, width and thickness.
Estimate foundation, stem-wall and retaining-wall concrete quantity.
Convert volume into ready-mix loads and supplier-priced material cost.
For a rectangular slab, the formula is:
For example, a 24 ft × 30 ft slab at 4 in thick contains 240 ft³, or approximately 8.89 yd³ of concrete before allowance. An 8% order allowance produces about 9.60 yd³.
Oregon Building Codes Division lists the 2023 Oregon Residential Specialty Code (ORSC) for one- and two-family dwellings and townhouses. The residential-code page notes that the 2023 ORSC construction provisions became mandatory April 1, 2024 and are based on the 2021 International Residential Code. Oregon also publishes errata and interim amendments, so a project should use the current adopted material rather than an old downloaded detail.
This calculator does not attempt to reproduce the Oregon code. Concrete dimensions, reinforcing, footing depth and other requirements should come from the approved plans, local building department and the applicable specialty code.
A common search is “how deep should concrete footings be in Oregon?” Oregon does not have one useful statewide frost-depth number for every site. The Building Codes Division's Oregon Design Criteria Hub provides site-specific climatic and geographic design criteria, including ORSC frost-line depth.
Oregon's permit-ready deck material also shows frost-line depth as a design criterion rather than a single number, with project criteria selected for the site. That is why the footing calculator asks for the actual footing dimensions and does not automatically assign a frost depth based only on the word “Oregon.”
Portland-area projects use the same volume formulas as the rest of Oregon, but delivery access can be very different between a tight urban infill site and a suburban driveway. When ready-mix trucks cannot discharge directly to the forms, a pump, conveyor, buggy or additional labor may be needed.
Use the Concrete Pump Size Calculator when placement access is limited, and verify permits, street-use requirements and site-specific building criteria with the applicable authority.
For Salem and other Willamette Valley projects, accurate quantity takeoff should include slab thickness changes, thickened edges, footing steps and wall openings. Wet-season site conditions can also make base preparation, drainage and access more important during construction.
Do not add extra concrete simply to compensate for poorly prepared subgrade. A more accurate base elevation produces a more predictable concrete quantity and better slab support.
Eugene residential and site-concrete projects can range from patios and walkways to garage floors, retaining walls and foundations. For irregular patios or additions, divide the work into rectangles and calculate each zone independently. Curved or custom shapes can be estimated with related geometry calculators.
If replacing existing pavement, calculate demolition separately with the Concrete Disposal Calculator.
Central Oregon projects can face different climatic and site conditions than lower-elevation western Oregon. This is exactly why statewide assumptions about frost depth or exposure are unreliable. Use the Oregon Design Criteria Hub and project-specific requirements before finalizing footing geometry or exterior slab details.
Quantity math remains straightforward once the approved dimensions are known: calculate each concrete shape, combine volumes and then add the project order allowance.
Southern Oregon conditions can also vary by elevation and location. A project near a valley floor and a project at a higher-elevation site should not be treated as identical merely because both have Oregon addresses. Use address-specific design criteria and local jurisdiction guidance.
For foundations, use the Concrete Footing Depth Calculator after obtaining the required local frost or design depth.
Cubic yards are the standard ready-mix ordering unit in the United States. One cubic yard contains 27 cubic feet. For a slab, calculate cubic feet first and divide by 27. For multiple components, calculate each component separately and add the cubic-yard totals.
The allowance should reflect the actual project, including form tolerance, subgrade variation, pump/placement loss and supplier ordering increments. Avoid using an arbitrary large allowance when accurate field measurements are available.
Bagged concrete can be practical for fence posts, small pads, repairs and short curb sections. Large patios, driveways, garage floors, foundations and retaining walls typically require enough volume that ready mix is more efficient.
The Order Planner uses approximate bag yields of 0.45 ft³ for a 60 lb bag and 0.60 ft³ for an 80 lb bag. Product yields vary, so check the actual manufacturer label before purchase.
Concrete cost varies by producer, plant location, mix specification, admixtures, fibers, distance, minimum-load policy and scheduling. Rather than displaying an unreliable statewide price, this calculator lets you enter a current supplier quote per cubic yard.
Potential additional charges can include short-load fees, weekend or after-hours placement, waiting time, hot-water or cold-weather adjustments, special admixtures, fibers, color, pump service and delivery beyond the normal service radius.
For a continuous strip footing, multiply total length by footing width and thickness. Convert width and thickness from inches to feet before multiplying. The footing mode performs these conversions automatically.
The formula does not decide whether the footing is wide, thick or deep enough. Oregon site criteria, soil bearing, loads, seismic design and the governing code can affect the approved foundation detail.
Foundation-wall volume equals net wall face area multiplied by wall thickness. Large openings can be deducted when they materially reduce volume. Small penetrations are often left in the quantity because their effect is minor compared with placement allowance.
Retaining walls require additional design considerations including soil pressure, drainage and reinforcement. Use the calculator only for material volume after the dimensions are established.
Driveway takeoff should include the full pavement area and actual design thickness. Thickened aprons, transitions, curb interfaces and localized loading areas can add concrete. For irregular driveways, divide the plan into rectangles, triangles or other measurable zones.
Drainage is especially important for exterior concrete. The finished surface should follow the approved grading and drainage plan rather than simply being poured level because the volume calculation is easier.
For a rectangular patio, multiply length × width × thickness. If a patio includes steps, seat walls, fire-pit pads or thickened perimeter sections, calculate those elements separately. Use the Concrete Patio Calculator for a dedicated patio workflow.
Oregon DEQ administers materials-management and recycling programs and recognizes construction and demolition debris within Oregon's recovery framework. When old concrete is removed, recycling may be available depending on local facilities and contamination.
Clean concrete, mixed demolition debris, reinforced concrete and contaminated material can have different acceptance requirements. Call the receiving facility before hauling and use the Concrete Disposal Calculator to estimate weight and loads.
Use the Oregon Design Criteria Hub or local jurisdiction for the project site.
Forms, grade and placement conditions can make actual use differ from theoretical geometry.
Thickness in inches must be divided by 12 before multiplying by square feet.
Measure the area actually receiving concrete.
Add only additional depth when the regular slab is already included.
Actual load sizes depend on supplier operations and legal limits.
Oregon concrete pricing can vary by plant, location, mix and delivery conditions.
The calculator does not design reinforcement, footing depth, wall thickness or slab thickness.
For residential-code information, use the Oregon Building Codes Division — Residential Structures Code Program. For address/site-specific frost-line depth and other design criteria, use the Oregon Design Criteria Hub.
Oregon BCD also publishes adopted specialty codes and amendments. For recycling and materials-management information, see the Oregon Department of Environmental Quality recycling resources.
This Concrete Calculator in Oregon is a material-estimating tool. It does not replace Oregon building codes, local amendments, engineering, geotechnical information, permits, inspections or supplier mix requirements.
A clear project-planning diagram showing measurement, concrete volume, site criteria and ready-mix ordering.
Common questions about Oregon concrete volume, cubic yards, footings, ready mix and local design criteria.