Denver Concrete Calculator







Denver Concrete Calculator | Cubic Yards, Bags & CO Cost | Free Tool



🏔️ CBC / IBC COMPLIANT · ACI 318 · DENVER, COLORADO — 5,280 FT
✓ 100% Free

Denver
Concrete Calculator — Yards, Bags & Cost

Calculate cubic yards, bags needed, and Denver CO-accurate ready-mix costs for any concrete project — driveways, patios, foundations, basements, commercial slabs, retaining walls & more at 5,280 ft elevation.

$145
Avg Denver Ready-Mix (per Cu Yd)
4,000
Min PSI — Denver Outdoor Flatwork
36 in
Frost Depth — Denver / Adams Co.
CBC
Colorado Building Code
🚗 Driveway
🏡 Patio
🏠 Basement Foundation
🏢 Commercial Slab
🧱 Retaining Wall
🛤️ Sidewalk


The Denver Concrete Calculator helps homeowners, contractors, and builders across the Denver metro estimate cubic yards, bag count, and ready-mix costs for any concrete project in Denver, Adams, Arapahoe, Jefferson, and Douglas counties. Denver pricing runs $133–$160/yd — slightly above the national average — reflecting Colorado’s unique combination of high-altitude curing effects at 5,280 ft, expansive bentonite clay soils, 30–45 freeze-thaw cycles per year, and 36-inch frost depths that demand careful mix design and subgrade preparation on every pour. Denver’s explosive population growth and booming construction market — fueled by the tech sector, aerospace, energy, and a major residential build-out from Westminster to Castle Rock — makes it one of the top-five fastest-growing concrete markets in the nation. Colorado Building Code (CBC) mandates 4,000 PSI air-entrained concrete with 4.5–7.5% air content and W/C ≤ 0.45 for all outdoor flatwork statewide. Enter your dimensions for instant, Denver-accurate results.

🏔️ Denver Concrete Calculator

🏔️ Denver CO-Accurate Pricing · CBC / IBC Compliant · 5,280 ft Elevation
Denver Concrete Calculator
Cubic yards, bags needed & Denver ready-mix cost — instant results
🚗 Driveway
🏡 Patio
🏠 Basement
🏢 Commercial
🧱 Retaining Wall

Enter project dimensions to calculate volume, bags, and estimated Denver CO material cost.


Colorado Building Code requires permits for all structural concrete in Denver. Contact Denver Community Planning and Development (CPD) at (720) 865-2705 before starting any structural pour.








Patio 4 in · Driveway 5–6 in · Garage 5–6 in · Commercial slab 5–7 in · Basement floor 4–5 in · Foundation wall 10–12 in




Cubic Yards Required
—
Including waste factor

📋 Project Summary

    💵 Denver Cost Estimate

      📐 Denver Slab Cross-Section — CBC Expansive Clay & Freeze-Thaw Standard

      Broom / Brushed Finish — Denver CO Standard
      Concrete — 5–6 in. (CBC Residential) / 6–7 in. (Commercial / Industrial)
      4,000 PSI · Air-Entrained 4.5–7.5% · W/C Ratio ≤ 0.45 · Rebar or Wire Mesh
      ⬛ Rebar / Wire Mesh — Driveways, Retaining Walls, Commercial Slabs (CBC Required)
      🪨 4–6 in. Non-Expansive Compacted Gravel Base (Critical for Denver Bentonite Clay)
      Compacted Non-Expansive Fill or Undisturbed Subgrade — Bentonite Clay Mitigated / Below 36 in. Frost Depth
      27
      Cu ft per cubic yard
      45
      80 lb bags per cu yd
      $145
      Avg Denver ready-mix / yd
      Concrete Slab
      Rebar Layer
      Non-Expansive Gravel
      Bentonite Clay Subgrade

      Denver Concrete Calculator — What You Need to Know

      Denver sits at exactly 5,280 feet above sea level — the famous “Mile High City” — a distinction that creates a unique concrete environment found in no other major US metro. At altitude, lower atmospheric pressure causes concrete to lose moisture more rapidly, accelerating surface set times and increasing the risk of plastic shrinkage cracking during warm, sunny, low-humidity Front Range afternoons. Denver contractors routinely use evaporation retarders and misting during flatwork finishing that would be unnecessary at sea level. The city’s most notorious concrete challenge, however, is its expansive bentonite clay soils — present throughout the Denver metro and particularly severe in Aurora, Lakewood, Thornton, and the southern suburbs. Bentonite clay can swell up to 10% in volume when wet and shrink dramatically when dry, generating heaving forces easily capable of cracking slabs, tilting retaining walls, and displacing footings. Colorado Building Code (CBC) mandates 4,000 PSI air-entrained concrete for all outdoor flatwork, and Denver’s 36-inch frost depth requires all structural footings to extend well below grade across the metro area.

      🔵 Denver / Colorado Building Code Minimum Concrete Requirements

      All outdoor flatwork statewide: 4,000 PSI + 4.5–7.5% air entrainment, W/C ≤ 0.45 · Basement / foundation walls: 4,000 PSI min., exterior damp-proofing required, CBC permit and inspection required · Expansive soil areas (most of Denver metro): structural engineer’s soil report and foundation design required — check with Denver CPD · Footings: must extend below 36 in. frost depth in Denver, Adams, Arapahoe, and Jefferson counties. Verify with Denver CPD at (720) 865-2705 for all permit requirements.

      🚗 Denver Driveway

      A standard 10×20 ft driveway at 5 in. needs ~3.1 cubic yards. At Denver pricing ($136–$154/yd for 4,000 PSI), material costs $422–$477. Denver driveways over expansive clay must have a 4–6 in. non-expansive compacted gravel base — never pour directly on bentonite clay. Apply an evaporation retarder on windy or sunny days at 5,280 ft. Seal after the 28-day cure with a penetrating silane-siloxane sealer and reseal every 2 years.

      🏠 Denver Full Basement

      Full basements are standard in Denver — the 36-inch frost depth and Front Range climate make them practical and common in both the city and suburbs. A standard 1,000 sq ft basement floor at 4 in. needs ~12.3 cubic yards. Foundation walls for a typical Denver ranch or two-story add 40–70+ cubic yards. In expansive soil areas, CBC requires a structural engineer’s geotechnical report and engineered foundation design — critical in Aurora, Thornton, Lakewood, and the Douglas County suburbs.

      🏢 Denver Commercial Slab

      Denver’s booming tech, aerospace, and energy sectors drive strong commercial concrete demand along the I-25, I-70, and E-470 corridors. A standard 80×120 ft office or flex-industrial slab at 6 in. needs ~213 cubic yards. Specify 4,500 PSI with fiber reinforcement, 6-mil vapor barrier, and a non-expansive compacted sub-base for all commercial Denver slabs. Lone Tree, Broomfield, Centennial, and the Denver Tech Center (DTC) are the metro’s busiest commercial zones — coordinate with plants 48+ hours in advance on large pours.

      How to Calculate Concrete Volume — Denver CO

      Multiply length × width × (depth in inches ÷ 12) to get cubic feet, then divide by 27 for cubic yards. For Denver basement floors, calculate net floor area after subtracting column footings and interior load-bearing pads. Always add a minimum 10% waste factor — Denver metro short-load fees of $90–$160 for orders under 3–5 cubic yards apply at most Front Range plants. On Denver’s frequently windy spring afternoons — when the infamous “Chinook winds” can drop relative humidity to 10–15% — add an evaporation retarder to your mix and have extra finishers ready, as surface set times at altitude and low humidity can be dramatically faster than at sea level or on calm days.

      📐 Denver Concrete Formula

      Volume (cu ft) = Length (ft) × Width (ft) × [Depth (in) ÷ 12]
      Volume (cu yd) = Volume (cu ft) ÷ 27
      Order Qty = CEIL[ Volume (cu yd) × Waste Factor ]
      Example: 20 ft × 10 ft Denver driveway × 5 in = 83.3 cu ft = 3.09 cu yd → Order 3.4 cu yd

      ⚠️ Denver Expansive Bentonite Clay Soil Warning

      The Denver metro sits on some of the most expansive soils in the United States — bentonite clay formations that underlie much of Adams, Arapahoe, Jefferson, and Douglas counties. Bentonite can swell 5–10% in volume when saturated by Colorado’s spring snowmelt and rain, and shrink dramatically during Denver’s hot, dry late summers — generating heave forces that can lift a concrete slab several inches, crack foundation walls, and tilt retaining walls. Before any concrete pour in Denver: obtain a geotechnical soil report on expansive sites, overexcavate to undisturbed or non-expansive material, replace with a compacted non-expansive structural fill, install a minimum 4–6 in. compacted gravel base, and slope all surfaces away from the structure for positive drainage. In high-expansion areas — particularly in Aurora (east of I-225), Thornton, Lakewood, and Highlands Ranch — a licensed Colorado geotechnical engineer’s foundation design is required under CBC before any structural concrete work.

      Denver Concrete Calculator — Pricing Reference

      Denver ready-mix pricing is moderately above the national average, driven by Colorado’s strict air-entrainment and freeze-thaw mix specifications, the premium cost of importing quality aggregates to the Front Range, and strong construction demand from Denver’s fast-growing population. Major Denver suppliers include LaFarge Holcim, Cemex, Martin Marietta Aggregates, CalPortland, and several independent Colorado Front Range operations along I-25, I-70, US-36, and the E-470 tollway corridor. Central Denver, Capitol Hill, Stapleton, and the Denver Tech Center (DTC) are well-served. Outlying suburbs in Douglas County (Castle Rock, Parker, Lone Tree) and southern Jefferson County (Evergreen, Conifer) may see $10–$20/yd in haul surcharges. Compare with the Colorado Concrete Calculator and the Colorado Springs Concrete Calculator for regional pricing context.

      Mix Type / PSI Denver Price / Cu Yd National Avg Best For Air Entrained? CBC Code
      3,500 PSI — Interior $120–$136 $130–$150 Protected basement floors, interior slabs Not Outdoor Interior Only
      4,000 PSI — Denver Standard $136–$154 $145–$165 Driveways, patios, sidewalks, garage floors Required Compliant
      4,500 PSI — Enhanced $146–$167 $155–$175 Heavy driveways, commercial slabs, retaining walls Required Compliant
      5,000 PSI — Industrial $158–$182 $163–$185 Industrial / warehouse / structural slabs Required Compliant
      5,500 PSI — High-Performance $172–$200 $172–$198 High-load commercial / structural high-rise Required Compliant
      Fiber / Stamped Decorative $155–$210 $155–$210 Patios, pool decks, decorative Denver / DTC Required Compliant

      3,500 PSI — Interior

      Denver Price / Cu Yd$120–$136
      National Avg$130–$150
      Best ForProtected basement floors, interior slabs

      4,000 PSI — Denver Standard

      Denver Price / Cu Yd$136–$154
      National Avg$145–$165
      Best ForDriveways, patios, sidewalks, garages

      4,500 PSI — Enhanced

      Denver Price / Cu Yd$146–$167
      National Avg$155–$175
      Best ForHeavy driveways, commercial, retaining walls

      5,000 PSI — Industrial

      Denver Price / Cu Yd$158–$182
      National Avg$163–$185
      Best ForIndustrial / warehouse / structural slabs

      5,500 PSI — High-Performance

      Denver Price / Cu Yd$172–$200
      National Avg$172–$198
      Best ForHigh-load commercial / structural high-rise

      Denver CO Concrete Project Tips

      • Always use an evaporation retarder at Denver’s altitude and dry climate — At 5,280 ft with low humidity and frequent afternoon Chinook winds, concrete surface moisture can evaporate 2–3× faster than at sea level. This causes plastic shrinkage cracking before the slab can even be finished. Apply a spray-applied evaporation retarder (such as Confilm or equivalent) immediately after screeding on any day when wind exceeds 10 mph, temperature exceeds 75°F, or relative humidity drops below 40% — all common Denver Front Range conditions from April through September.
      • Get a soil report before pouring over Denver’s expansive clay — Much of the Denver metro sits on expansive bentonite clay. Before any foundation, retaining wall, or large slab pour, commission a geotechnical soil report from a Colorado-licensed geotechnical engineer. In high-expansion zones (Aurora east of I-225, Thornton, Lakewood, most of Douglas County), CBC requires an engineered foundation design. Skipping the soil report is the single most expensive mistake Denver homeowners make — a heaved or cracked foundation slab in the metro can cost $15,000–$80,000+ to remediate.
      • Pull a permit from Denver CPD before any structural pour — City and County of Denver requires building permits for all foundations, structural retaining walls, basement slabs, driveway aprons at public streets, and structural commercial slabs. Contact Denver Community Planning and Development (CPD) at (720) 865-2705 or visit the Denver ePlan portal. Suburban projects in Aurora, Lakewood, Westminster, Arvada, or Centennial require permits from those respective municipalities — contact each city’s building department directly.
      • Use non-expansive fill and a proper gravel base under all flatwork — Never pour concrete directly on Denver’s native bentonite clay. Overexcavate to undisturbed, non-expansive material, replace with non-expansive structural fill compacted to 95% Proctor density, and install a minimum 4–6 in. compacted gravel base. On sloped Front Range lots — common in Jefferson County foothills and the Highlands Ranch area — install perimeter French drains to intercept Colorado snowmelt and spring rain before it saturates the clay subgrade.
      • Respect Denver’s 36-inch frost depth on all footings — Colorado Building Code requires all structural footings to extend below the 36-inch frost depth in Denver, Adams, Arapahoe, and Jefferson counties. Foothills Jefferson County communities (Evergreen, Conifer, Morrison) at higher elevations may have deeper requirements — verify with the Jefferson County Building Division. Shallow footings that freeze heave in Denver winters are a common and costly failure in non-permitted DIY construction projects.
      • Protect concrete from Denver’s intense UV and hail — Denver receives more annual hail events than almost any other US city, and its high-altitude sun delivers intense UV radiation that degrades unsealed concrete surfaces faster than at lower elevations. Apply a penetrating silane-siloxane sealer after the 28-day cure on all outdoor concrete, and reapply every 2–3 years. After large hail events, inspect decorative or thin-section concrete surfaces for pitting — Denver’s large hailstones can damage freshly-placed or improperly cured concrete slabs and patios before they reach design strength.
      • Order 10% extra — Denver short-load fees are significant — Most Denver metro and Front Range plants charge $90–$160 for loads under 3–5 cubic yards. Overordering by 10% is almost always more economical than scheduling a second delivery, especially during Denver’s busy spring and summer construction season when plant lead times stretch to 24–48 hours. For large commercial pours in the DTC, RiNo, or Broomfield corridors, contact LaFarge Holcim and Cemex plants 48–72 hours in advance to secure truck and pump availability.

      ✅ Denver vs. Aurora vs. Lakewood vs. Highlands Ranch — Pricing Snapshot

      City and County of Denver averages $136–$155/yd with strong plant competition from LaFarge, Cemex, and Martin Marietta along the I-25 and I-70 corridors. Aurora (Adams/Arapahoe counties) runs $138–$156/yd with excellent eastern metro plant access. Lakewood and Jefferson County average $138–$158/yd. Westminster, Arvada, and Broomfield (US-36 / NW corridor) average $136–$155/yd. Highlands Ranch, Lone Tree, and Castle Rock (Douglas County, S I-25 corridor) run $142–$165/yd with modest distance surcharges. Foothills communities (Evergreen, Conifer, Morrison) may see $15–$25/yd in access surcharges for mountain delivery. For all large commercial pours along the Tech Center and Broomfield corridors, coordinate 48–72 hours ahead during Denver’s peak spring and summer construction season.

      Denver Concrete Calculator — Frequently Asked Questions

      How much does concrete cost per yard in Denver CO?+
      $133–$160 per cubic yard for standard ready-mix in Denver and Metro Denver. City of Denver averages $136–$155/yd. Aurora and Lakewood run $138–$158/yd. Broomfield and Westminster average $136–$155/yd. Douglas County suburbs (Highlands Ranch, Castle Rock) run $142–$165/yd. Foothills communities see $148–$175/yd with mountain surcharges. Short-load fees of $90–$160 apply for orders under 3–5 cubic yards at most Denver metro plants.
      What PSI concrete is required in Denver CO?+
      4,000 PSI with 4.5–7.5% air entrainment and W/C ≤ 0.45 for all outdoor flatwork under Colorado Building Code — driveways, patios, sidewalks, and garage floors. 4,500 PSI for heavy commercial slabs and road-adjacent work. 5,000 PSI for industrial and warehouse slabs. Interior protected basement floors may use 3,500 PSI. Never use non-air-entrained concrete outdoors in Denver’s freeze-thaw environment.
      How deep must footings be in Denver CO?+
      36 inches below finished grade in Denver, Adams, Arapahoe, and Jefferson counties — Colorado Building Code requires all structural footings to extend below the local frost depth. Higher-elevation Jefferson County foothills communities (Evergreen at 7,000 ft, Conifer at 8,000+ ft) may have deeper frost depth requirements of 42–48 in. Always confirm your exact local requirement with Denver CPD at (720) 865-2705 or your local municipality’s building department before excavating.
      Do I need a permit for concrete work in Denver CO?+
      Yes for all structural work. City and County of Denver requires permits for foundations, basement slabs, structural retaining walls over 4 ft, driveway aprons at public streets, and commercial structural slabs. Simple residential patios on private property typically don’t require a permit. Contact Denver CPD at (720) 865-2705 or denvergov.org/cpd. Suburban Denver projects in Aurora, Lakewood, Westminster, Arvada, or Centennial each have their own building departments — contact the specific city’s permit office before starting any structural work.
      How does Denver’s altitude affect concrete?+
      At 5,280 ft, Denver’s lower atmospheric pressure causes faster surface moisture evaporation — especially on dry, sunny, or windy Front Range days. This speeds up surface set time, narrows the finishing window, and dramatically increases the risk of plastic shrinkage cracking before the slab is finished. Always use a spray-applied evaporation retarder on exposed surfaces, schedule large pours early in the morning, and have additional finishers on standby. Cold-weather altitude pours also require heated enclosures and insulated blankets earlier in the season than at lower-elevation cities.
      Who supplies ready-mix concrete in Denver CO?+
      Major Denver metro suppliers include LaFarge Holcim, Cemex, Martin Marietta Aggregates, CalPortland, and Colorado Materials, with plants along I-25, I-70, I-270, US-36, and the E-470 tollway corridor. Most plants offer same-day service for residential orders under 10 yards during off-peak seasons. During Denver’s peak spring and summer construction season (April–September), coordinate large commercial pours 48–72 hours in advance. Mountain foothills deliveries to Jefferson County communities require specialized trucks and extended lead times — plan 72+ hours ahead for Evergreen, Conifer, or Morrison projects.
      How long does concrete cure in Denver CO?+
      24 hrs foot traffic · 7 days light vehicles · 28 days full design strength. In Denver’s dry climate and intense sunshine, apply a curing compound or keep concrete moist-cured under wet burlap for at least 7 days — the high-altitude low humidity can pull surface moisture out of fresh concrete faster than almost anywhere in the US. In Denver winters below 40°F (October through April), use insulated curing blankets and maintain slab temperature above 50°F for at least 72 hours. Never pour when a hard freeze is forecast within 24 hours without a full heated enclosure system in place.

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      Official Denver Concrete Resources

      Denver CPD, CDOT, and industry references for compliant concrete work across the Mile High City.

      🏛️

      Denver Community Planning and Development — CPD

      Denver Building Permits

      Apply for Denver building permits, schedule footing and slab inspections, verify licensed contractor requirements, and access Colorado Building Code (CBC) provisions for all residential and commercial concrete work in the City and County of Denver — including foundations, basement slabs, retaining walls, driveways, expansive soil foundation designs, and commercial structural slabs. Call (720) 865-2705 for permit questions or visit the Denver ePlan portal online.

      Visit Denver CPD
      🛤️

      Colorado Department of Transportation — CDOT

      CDOT Concrete Standards

      Access CDOT standard specifications for concrete construction, driveway access permit applications for I-25, I-70, US-36, E-470, and other state-maintained highways in the Denver metro, Front Range frost depth and soil expansion maps by county, and concrete standards for road-adjacent projects — including all state highway rights-of-way bordering residential and commercial properties in Denver, Adams, Arapahoe, Jefferson, and Douglas counties along the Colorado Front Range corridor.

      Visit CDOT
      📘

      National Ready Mixed Concrete Assoc.

      Industry Resource

      Find NRMCA-certified ready-mix producers across the Denver metro and Colorado Front Range, access ACI 318 high-altitude and cold-weather concrete placement guides tailored to Denver’s unique 5,280 ft environment, expansive soil foundation concrete resources for Front Range bentonite clay conditions, freeze-thaw resistant mix design recommendations, and expert guidance on commercial and industrial concrete specifications for Denver’s fast-growing tech, aerospace, and energy sector construction market.

      Visit NRMCA