Concrete Column Slenderness Calculator (USA)
✔ 100% Free
Portland Concrete
Calculator — Slabs, Driveways & Patios
Instantly estimate concrete volume in cubic yards and bags for any project in Portland, Oregon. Get 2025 ready-mix prices, contractor cost ranges, and bag counts for slabs, driveways, patios, and footings.
$155
Avg. Ready-Mix Per Cu Yd (Portland 2025)
4–6 in
Standard Slab Thickness Portland, OR
$4,800
Avg. Driveway Cost Portland, OR
3,000
PSI Minimum Residential Slab (ACI)
🟦 Concrete Slab
🚗 Driveway / Apron
☀️ Patio / Outdoor
🪨 Footings / Foundation
🪵 Post Holes
🛤️ Walkway / Sidewalk
The Portland Concrete Calculator helps homeowners, contractors, and DIYers in Portland, Oregon quickly estimate how much concrete they need for any project — in cubic yards, cubic feet, or bags. Whether you are pouring a patio in city-permitted Southeast Portland, replacing a driveway in Beaverton, or setting footings in Gresham, this free tool calculates exact material volumes using your project dimensions and gives you 2025 Portland-area ready-mix and bagged concrete pricing so you can budget accurately before you buy.
🧱 Portland Concrete Calculator — Oregon
Enter your project dimensions to get cubic yards, cubic feet, bags needed & Portland 2025 cost estimate.
Standard residential patio or slab. Minimum 4 in thick per Portland BDS code.
Slab 4 in · Driveway 6 in · Footing 8–12 in · Walkway 4 in
Concrete Volume Required
—
Cubic yards including waste factor
📋 Project Summary
💵 Portland 2025 Cost Estimate
📐 Portland Concrete Slab Cross-Section — Layer Guide & Volume Reference
Broom-Finished / Exposed Aggregate Surface
Concrete Slab — 4 in. (Portland Standard)
Portland Cement · Sand · Aggregate · Water · w/c ≤ 0.50
🪨 4 in. Compacted Crushed Rock Sub-Base (Portland BDS Required)
Compacted Native Soil / Engineered Fill — Portland, OR
$155
Avg Ready-Mix Per Cu Yd Portland
45
80 lb Bags Per Cubic Yard
27
Cubic Feet Per Cubic Yard
Concrete Slab
Crushed Rock Base
Compacted Subgrade
Finished Surface
What Is a Portland Concrete Calculator?
A Portland concrete calculator is a tool specifically designed for homeowners and contractors in Portland, Oregon to estimate the exact amount of concrete needed for a project — measured in cubic yards (for ready-mix truck orders) or number of bags (for smaller DIY jobs). Unlike generic calculators, this tool uses Portland 2025 ready-mix pricing from local suppliers like CalPortland and Knife River, and reflects local building code requirements enforced by the Portland Bureau of Development Services (BDS).
🔵 Portland, OR Concrete Fast Facts (2025)
Portland ready-mix concrete costs approximately $145–$170 per cubic yard delivered, depending on mix design, supplier, and distance from the batch plant. Residential slabs require a minimum 3,000 PSI mix per ACI 318. Driveways typically require 4,000 PSI with air entrainment due to Portland’s freeze-thaw cycles in colder months (November–February). Always confirm with Portland BDS if your project requires a permit — slabs over 200 sq ft often do.
🏠 Residential Slabs & Patios
Most Portland residential concrete slabs are poured at 4 inches thick on a 4-inch compacted crushed rock base. A standard 12×20 ft patio requires approximately 3.0 cubic yards (including 10% waste), costing roughly $465–$510 in ready-mix materials at 2025 Portland rates.
🚗 Driveways in Portland
Portland driveways are typically poured 6 inches thick for passenger vehicles, increasing to 8 inches for trucks or RVs. A standard 10×20 ft single-car driveway requires approximately 3.7 cubic yards — just within the range where ordering a half-load ready-mix truck makes more sense than bagged concrete.
🪨 Footings & Foundations
Portland’s wet climate means footings must extend below the frost line — typically 12–18 inches in the Willamette Valley. Strip footings for residential structures typically require an 8–12 inch thick pour at 3,500–4,000 PSI. Always verify footing depth with a licensed Portland geotechnical engineer for new construction.
How to Calculate Concrete Volume for Portland Projects
Calculating concrete volume for any Portland project follows a straightforward formula. All you need are the project dimensions in feet and inches. The result in cubic yards tells you how much to order from a ready-mix supplier; the cubic feet figure tells you how many bags to buy at a Portland-area Home Depot, Lowe’s, or Menards.
📐 Portland Concrete Calculation Formula
Volume (cu ft) = Length (ft) × Width (ft) × [Depth (in) ÷ 12]
Volume (cu yd) = Volume (cu ft) ÷ 27
Bags Needed = CEIL[ Volume (cu ft) × Waste Factor ÷ Coverage per bag ]
Portland Example: 20 ft × 12 ft patio × 4 in = 80 cu ft = 2.96 cu yd → 3.26 cu yd (+10% waste)
Bags: 3.26 cu yd × 27 ÷ 0.60 = 147 × 80 lb bags OR order 3.5 cu yd ready-mix (~$543)
⚠️ Portland Weather & Concrete Pouring — Key Considerations
Portland’s rainy season (October–May) can complicate outdoor concrete pours. Never pour concrete on wet or frozen ground, and do not pour if rain is expected within 4–8 hours on an unsealed fresh slab. Portland’s average low in January is 37°F — always use warm mix water and insulating blankets below 40°F. In summer, Portland’s dry heat (avg. 85°F in July–August) requires accelerated curing management — mist the slab frequently and use curing compound within 20 minutes of finishing.
Portland Concrete Cost by Project — 2025 Reference Table
The table below shows typical concrete costs for common projects in the Portland, Oregon metro area in 2025, including both material-only and full installed (labor + material) cost ranges based on local contractor quotes.
| Project Type | Typical Size | Cu Yds Needed | Material Only (2025) | Installed Cost Portland | Mix Strength |
|---|---|---|---|---|---|
| Patio Slab (4 in) | 12×20 ft | ~3.0 cu yd | $465–$510 | $1,800–$2,800 | 3,000 PSI |
| Driveway (6 in) | 10×20 ft | ~3.7 cu yd | $570–$630 | $3,500–$5,500 | 4,000 PSI |
| Driveway (6 in) | 16×30 ft | ~8.9 cu yd | $1,380–$1,515 | $5,000–$8,500 | 4,000 PSI |
| Sidewalk / Walkway (4 in) | 4×50 ft | ~2.5 cu yd | $388–$425 | $1,200–$2,200 | 3,500 PSI |
| Garage Slab (4 in) | 20×20 ft | ~5.0 cu yd | $775–$850 | $3,000–$5,000 | 4,000 PSI |
| Strip Footing (10 in deep) | 4×40 ft | ~5.0 cu yd | $775–$850 | $2,500–$4,500 | 3,500 PSI |
| Concrete Steps (6 in avg) | 4 ft wide, 5 steps | ~0.8 cu yd | $124–$136 | $1,000–$2,500 | 4,000 PSI |
Patio Slab (4 in) — 12×20 ft
Cu Yds Needed~3.0 cu yd
Material Only$465–$510
Installed Portland$1,800–$2,800
Mix Strength3,000 PSI
Driveway (6 in) — 10×20 ft
Cu Yds Needed~3.7 cu yd
Material Only$570–$630
Installed Portland$3,500–$5,500
Mix Strength4,000 PSI
Driveway (6 in) — 16×30 ft
Cu Yds Needed~8.9 cu yd
Material Only$1,380–$1,515
Installed Portland$5,000–$8,500
Mix Strength4,000 PSI
Sidewalk / Walkway (4 in) — 4×50 ft
Cu Yds Needed~2.5 cu yd
Material Only$388–$425
Installed Portland$1,200–$2,200
Mix Strength3,500 PSI
Garage Slab (4 in) — 20×20 ft
Cu Yds Needed~5.0 cu yd
Material Only$775–$850
Installed Portland$3,000–$5,000
Mix Strength4,000 PSI
Strip Footing (10 in) — 4×40 ft
Cu Yds Needed~5.0 cu yd
Material Only$775–$850
Installed Portland$2,500–$4,500
Mix Strength3,500 PSI
Concrete Steps — 4 ft wide, 5 steps
Cu Yds Needed~0.8 cu yd
Material Only$124–$136
Installed Portland$1,000–$2,500
Mix Strength4,000 PSI
Portland Concrete Calculator: Ready-Mix vs. Bagged Concrete
One of the most important decisions for any Portland concrete project is whether to order ready-mix concrete from a local batch plant or purchase bags from a home improvement store. The answer depends almost entirely on the volume of your pour. Use the Portland Concrete Calculator above to find your cubic yardage, then use the guide below to decide.
🚚
Ready-Mix — Best for 1+ Cubic Yards
Order from local Portland suppliers including CalPortland, Knife River, or Central Concrete. Typically $145–$170/yard + delivery fee ($100–$175 short-load surcharge under 3 yards). Best for driveways, garage slabs, and large patios.
🛒
Bagged Concrete — Best Under 0.5 Cu Yd
Available at Portland-area Home Depot, Lowe’s, and Menards. Quikrete 80 lb bags run $8.50–$10 each; Sakrete $8–$9.50. Convenient for small pours, repairs, post holes, and projects under ~13 cubic feet.
⚖️
The 1-Yard Crossover Rule
At 1 cubic yard, 45 bags of 80 lb concrete cost ~$405 in materials alone — similar to ready-mix ($145–$175/yard + delivery). Factor in the labor of mixing 45 bags by hand, and ready-mix wins on total cost above 1 yard in Portland.
🌧️
Portland Rain — Short-Load Timing
Portland averages 144 rainy days per year. Schedule ready-mix deliveries in the May–October dry window when possible. If ordering in winter, confirm the supplier offers heated mix or fiber-reinforced concrete at no extra charge — most Portland batch plants do for orders over 3 yards.
🏗️
Volumetric Concrete (Portland Option)
Several Portland-area suppliers offer volumetric concrete trucks — they mix on-site and charge only for what you use. Ideal for odd-shaped pours, repairs, or projects requiring multiple mix designs. Typically 10–20% more expensive per yard than batch plant pricing.
📋
Portland BDS Permit Requirements
In Portland, concrete flatwork over 200 sq ft may require a site development permit. Concrete within 10 ft of property lines or in the public right-of-way requires approval from Portland Bureau of Transportation (PBOT). Always check with BDS before starting.
Portland Concrete Mix Requirements & Local Suppliers
Portland, Oregon follows the Oregon Residential Specialty Code (ORSC) and ACI 318 for all concrete construction. The Oregon Building Codes Division enforces minimum mix strengths and exposure class requirements that are particularly important in Portland due to the city’s freeze-thaw cycles and high annual rainfall of approximately 36 inches per year.
✅ Portland Concrete Mix Requirements by Application
Residential slabs on grade: 3,000 PSI minimum (w/c ≤ 0.58). Driveways exposed to de-icers: 4,500 PSI with air entrainment (6±1.5%). Footings: 2,500–3,500 PSI depending on soil bearing capacity. Garage floors: 4,000 PSI recommended. All Portland exterior slabs should use a Type I/II Portland cement mix meeting ASTM C150 standards.
- CalPortland (Portland) — Major Portland-area ready-mix supplier with multiple batch plants. Delivers throughout Multnomah, Washington, and Clackamas counties. Offers standard, fiber-reinforced, and air-entrained mixes.
- Knife River Materials — Ready-mix concrete serving the greater Portland metro. Known for reliable scheduling and consistent mix quality. Call ahead for short-load availability.
- Central Concrete Supply — Offers sustainable Portland Cement mixes including SCM (supplementary cementitious materials) options with fly ash or slag for reduced CO₂ footprint.
- Home Depot (multiple Portland locations) — Stocks Quikrete 80 lb, 60 lb, and 40 lb bags plus Fast-Setting and 5000 High Strength. Tool rentals (mixers, screeds) available in-store.
- Lowe’s Portland — Carries Sakrete High Strength and Pro-Mix lines. Price-match guarantee on Quikrete pricing.
Portland Concrete Calculator Tips — Getting the Best Results
Using a Portland Concrete Calculator accurately requires more than just entering dimensions. Portland’s unique climate, soil conditions, and building code environment mean there are several local factors that can significantly affect your concrete project’s success and cost.
🚫 Common Mistakes Portland Homeowners Make with Concrete
The most frequent errors include: under-ordering (always add at least 10% waste), pouring in rain without a tent or cover, skipping the compacted crushed rock sub-base (required by Portland BDS for slabs over 200 sq ft), and not cutting control joints — Portland’s clay-heavy soils are prone to differential settlement that causes cracking within 2–3 years if joints are omitted.
- Test your subgrade before ordering — Portland soils are often heavy clay (Willamette Silt Loam). If your subgrade feels soft or spongy, add 6 inches of 3/4-inch crushed rock, not just 4 inches, before pouring.
- Order 10–15% extra — Portland concrete trucks charge for what’s ordered but not always returned. A 5% under-estimate means re-ordering a partial load with a short-load surcharge of $100–$175.
- Use fiber reinforcement in Portland — Adding synthetic polypropylene fibers ($8–$12/yard extra) significantly reduces plastic shrinkage cracking in Portland’s damp spring weather and is recommended by most Portland contractors.
- Check the Portland BDS permit portal — Large flat concrete projects, retaining walls over 4 ft, and any work in flood zones (NE Portland near the Columbia River) require permits. Fines for unpermitted concrete work can reach $1,500+.
- Cure for 7 days minimum — Portland’s mild wet climate actually supports excellent curing conditions in spring and fall. Keep the slab moist by misting twice daily or use a liquid curing compound applied immediately after surface bleed water disappears.
- Cut control joints at 8–10 ft intervals — For a standard 4-inch slab, use a concrete saw or hand groover within 4–12 hours of pouring. Portland’s clay sub-soils require closer joint spacing than sandy soils.
Frequently Asked Questions — Portland Concrete Calculator
How much does concrete cost per yard in Portland, Oregon in 2025?+
Ready-mix concrete in Portland, OR costs approximately $145–$170 per cubic yard in 2025, depending on the mix design and supplier. Standard 3,000 PSI costs less; 4,000–5,000 PSI with air entrainment is at the higher end. Most Portland suppliers also charge a short-load fee of $100–$175 for orders under 3 yards and a delivery/fuel surcharge of $50–$100. Budget $200–$280 per yard all-in for small residential orders in the Portland metro area.
Do I need a permit to pour concrete in Portland, OR?+
It depends on the project size and location. Concrete slabs over 200 sq ft on residential property typically require a site development permit from Portland BDS. Any concrete work in the public right-of-way (sidewalks, curb cuts, driveways that cross the sidewalk) requires a Portland Bureau of Transportation (PBOT) right-of-way permit. Concrete in flood hazard areas near the Columbia River or Johnson Creek also requires additional permits. Check the Portland BDS permit portal or call 503-823-7300 before starting.
How many cubic yards do I need for a 20×20 Portland patio at 4 inches thick?+
For a 20×20 ft patio at 4 inches thick: Volume = 20 × 20 × (4/12) = 133.3 cu ft ÷ 27 = 4.94 cu yd. With 10% waste: 5.43 cubic yards, which you would order as 5.5 yards from a Portland ready-mix supplier. At $155/yard average that is approximately $853 in concrete materials plus delivery. Alternatively, this would require 245 × 80 lb bags of Quikrete — making ready-mix the far better choice at this volume.
What PSI concrete is required for a driveway in Portland, Oregon?+
Portland-area contractors and the Oregon Residential Specialty Code recommend a minimum of 4,000 PSI for residential driveways. For driveways exposed to de-icing salts or with heavy vehicles (trucks, RVs), use 4,500 PSI with 5–7% air entrainment to resist Portland’s freeze-thaw cycles. Never use de-icing salt on a new Portland driveway in the first winter — the concrete has not fully cured and salt can cause surface scaling. Use sand for traction instead.
When is the best time to pour concrete in Portland, OR?+
The ideal Portland concrete pouring season is May through October, when rainfall is minimal and temperatures stay between 50–85°F. Avoid pouring during Portland’s rainy season (November–April) unless you can tent the area and protect the fresh pour from rain for at least 8 hours. Concrete should not be poured below 40°F without using warm mix water and insulating blankets. Portland averages about 36 inches of rain annually, most of it between October and March.
How much does it cost to hire a concrete contractor in Portland, OR?+
Portland concrete contractors typically charge $6–$12 per square foot for installed flatwork (including labor, materials, forming, and finishing). A standard 400 sq ft patio costs $2,400–$4,800 installed. Driveways run $8–$15/sq ft depending on thickness and site conditions. Complex projects with heavy reinforcement, stamped or decorative finishes, or difficult access (steep lots are common in Portland’s West Hills) can cost $15–$25+/sq ft. Always get 3 quotes from licensed Oregon CCB contractors.
How thick should a concrete slab be in Portland, Oregon?+
Minimum thickness requirements in Portland:
- Residential patio / walkway: 4 inches (minimum per ORSC)
- Driveway (passenger vehicles): 6 inches
- Garage floor: 4–6 inches depending on vehicle load
- Footings: 8–12 inches depending on structural load and soil bearing capacity
- Basement floor slabs: 3.5 inches minimum per IRC
Always pour a thickened edge (6–8 inches) at slab perimeters to resist Portland’s heavy clay soil movement.
Does Portland’s clay soil affect my concrete slab?+
Yes — Portland’s clay-heavy soils (especially the Willamette Silt Loam found across most of the Portland metro) expand when wet and contract when dry, causing slabs to crack and heave if not properly supported. Best practices include: excavating 4–6 inches of native clay and replacing with compacted 3/4-inch crushed rock; adding a 6-mil poly vapor barrier under the slab; cutting control joints every 8–10 ft; and using fiber-reinforced concrete. Slabs on heavy clay without a proper base typically crack within 2–5 years in Portland.
Related Portland & Oregon Concrete Calculators
Providence Concrete Calculator
Estimate concrete for slabs, driveways & patios in Providence, RI
Providence Slab Calculator
Slab-specific concrete volume & cost estimator for Providence
Provo Concrete Calculator
Cubic yards & cost estimates for concrete projects in Provo, UT
Provo Patio Calculator
Patio concrete volume & 2025 pricing for Provo, Utah projects
Portland Concrete Resources & Official References
Trusted Portland-area guides, building codes, and supplier references for your 2025 concrete project.
🏛️
Portland Bureau of Development Services
Official Portland Resource
The official Portland BDS portal for residential building permits, code requirements for concrete slabs, driveways, and foundation work. Check permit requirements, submit applications, and find licensed Oregon CCB contractors for your Portland project.
Oregon Building Codes Division
State Code Reference
Oregon’s official building codes division administers the Oregon Residential Specialty Code (ORSC) and Oregon Structural Specialty Code (OSSC), which govern all concrete construction minimum standards statewide including Portland projects.
CalPortland Ready-Mix — Portland
Local Supplier
CalPortland is one of the largest ready-mix concrete suppliers serving the Portland, Oregon metro area. Offers standard, high-strength, air-entrained, fiber-reinforced, and specialty mix designs. Multiple batch plants serving Multnomah, Washington, and Clackamas counties.