Lexington Concrete Calculator
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Lexington
Concrete Calculator — Yards, Bags & Cost
Calculate cubic yards, bags needed, and Lexington KY-accurate ready-mix costs for driveways, patios, garage slabs, foundations & footings across Fayette County and the greater Lexington Kentucky Bluegrass metro.
$144
Avg Lexington Ready-Mix (per Cu Yd)
18″
Frost Depth — Lexington / Fayette Co.
3,500
Min PSI — KY Exterior Standard
Karst
Geology — Limestone Dissolution Risk
🚗 Driveway
🏠 Garage Floor
🏗️ Foundation
🪨 Footings
🛤️ Patio / Slab
🐴 Bluegrass Karst Limestone
The Lexington Concrete Calculator helps homeowners, contractors, and builders across Lexington, Georgetown, Nicholasville, Richmond, Winchester, and Fayette County estimate cubic yards, bag count, and ready-mix costs for any Kentucky concrete project. Lexington ready-mix runs $133–$168/yd — competitive Bluegrass State pricing served by multiple Fayette County batch plants. Lexington’s climate is a humid continental transitional zone: hot, muggy summers reaching 95°F, cold winters with 15–25 freeze-thaw cycles per year, and an 18-inch frost depth. Air entrainment (4–6%) is recommended for all exterior flatwork to guard against Kentucky’s moderate but consistent freeze-thaw cycling. Lexington’s most unique geological challenge is its karst limestone bedrock — the same formation responsible for Mammoth Cave — which creates localized sinkhole and void risk beneath foundations. The region’s Maury silt loam and Bluegrass clay soils are moderately expansive and require proper sub-base preparation. Enter your dimensions for instant, Lexington-accurate results.
🐴 Lexington Concrete Calculator
🐴 Fayette County Pricing · Kentucky Building Code · Karst Limestone, Bluegrass Clay & Freeze-Thaw Guide
Lexington Concrete Calculator
Cubic yards, bags & Lexington KY ready-mix cost — instant results
🚗 Driveway
🏠 Garage
🏗️ Foundation
🪨 Footings
🛤️ Patio
Enter project dimensions to calculate volume, bags, and estimated Lexington KY material cost.
Use 4–5 in. for driveways. 3,500 PSI + 4–6% air entrainment recommended for all Lexington exterior flatwork. Footings must extend below the 18 in. frost depth. Karst site? Request a geotech probe before pouring any Lexington foundation. Avoid deicing salt for the first winter.
Patio 4 in · Sidewalk 4 in · Driveway 4–5 in · Garage 4 in · Footing 10–14 in (below 18 in. frost) · Foundation 8–10 in
Cubic Yards Required
—
Including waste factor
📋 Project Summary
💵 Lexington Cost Estimate
📐 Lexington Driveway Cross-Section — Kentucky / Fayette County Bluegrass Standard Layers
Broom Finish — Traction Required · KY Freeze-Thaw Surface Texture Standard
Concrete — 4–5 in. (Driveways) · 4 in. (Patios & Sidewalks)
3,500 PSI · 4–6% Air Entrainment · W/C ≤ 0.50 · #3 Rebar or Fiber Mesh
❄️ 4–6% Air Entrainment — Recommended KY Exterior · 15–25 Freeze-Thaw Cycles/Year
🔵 #3 Rebar or Fiber Mesh — Recommended Over Bluegrass Clay & Karst Sub-Base
🟩 6 mil Vapor Barrier — Interior Slabs, Basements & Garage Floors
🪨 4–6 in. Compacted Crushed Limestone Base — Kentucky Bluegrass Standard Sub-Base
🪨 Maury Silt Loam / Bluegrass Clay — Compact to 95% Proctor; Probe for Karst Voids Before Foundation Pours
🟡 Lexington Limestone Formation — Karst Karst Bedrock · Void & Dissolution Risk Below Grade
❄️ 18-Inch Frost Depth — All Lexington Footings Must Extend Below This Line
27
Cu ft per cubic yard
45
80 lb bags per cu yd
$144
Avg Lexington ready-mix / yd
Concrete Slab
Air Entrainment
Rebar / Mesh
Vapor Barrier
Limestone Base
Karst Bedrock
Frost Line
Lexington Concrete — Key Local Considerations
🔵 Kentucky Building Code — Lexington Concrete Requirements
Exterior flatwork minimum: 3,500 PSI + 4–6% air entrainment recommended · Structural concrete: 4,000 PSI for foundations and grade beams · Interior slabs: 3,000 PSI (no air entrainment needed) · Frost depth: 18 in. — all Lexington footings must extend below · Karst geology: Geotech probe strongly recommended before any Lexington structural foundation pour · Rebar: #3 minimum for residential flatwork over Bluegrass clay · Curing: 7-day minimum; insulated blankets for pours when temps drop below 40°F · Deicing: Avoid all chloride-based deicers for first 12 months. Confirm with Lexington-Fayette Urban County Government — Permits & Inspections before starting permitted work.
🚗 Lexington Driveway Concrete
A standard 20×20 ft driveway at 4 inches needs ~4.9 cu yd. At Lexington pricing ($140–$158/yd for 3,500 PSI air-entrained), material runs $686–$774. Air entrainment is important in Lexington — Kentucky’s transitional climate delivers enough freeze-thaw cycles to cause surface scaling on non-air-entrained concrete within 4–7 years, especially when deicing salts are applied. Specify 4–6% air and W/C ≤ 0.50 for all Lexington driveway pours and seal the surface at 28 days.
🪨 Karst Limestone — Lexington’s Unique Foundation Risk
Lexington sits atop the Lexington Limestone Formation — a Ordovician-age carbonate bedrock riddled with dissolution voids, fractures, and incipient sinkholes. This karst geology is the same system underlying Mammoth Cave in western Kentucky. Dissolution voids can be inches to feet below a building’s footprint with no surface indication. For any Lexington structural foundation, a geotechnical probe or GPR (ground-penetrating radar) survey is strongly recommended before excavation to identify voids that would require grouting before concrete placement.
🌿 Bluegrass Clay & Maury Silt Loam
Fayette County’s famous Maury silt loam — the rich Bluegrass soil series that underpins Kentucky’s horse farm legacy — is a moderately plastic, fine-textured soil with a PI of 10–20. It is moderately expansive compared to East Texas red clay but still requires proper moisture-conditioning and compaction before concrete sub-base placement. Compact Maury silt loam to 95% of Standard Proctor density at optimum moisture content, then place 4–6 inches of compacted crushed limestone before pouring any Lexington slab or foundation.
🪨 Lexington Karst Limestone — Complete Foundation Risk Protocol
The karst limestone geology underlying Lexington and Fayette County is the most geologically distinctive foundation challenge in the Kentucky Bluegrass region. Unlike expansive clay risks that are widespread, karst void risk is highly localized — two adjacent lots can have entirely different subsurface conditions. Every Lexington structural foundation should follow this protocol: (1) commission a licensed Kentucky geotechnical engineer to conduct a pre-design soil borings and probe investigation — borings should extend at least 5 feet into sound limestone to confirm bearing capacity; (2) if voids or dissolution zones are encountered above or within the bearing zone, pressure-grout all cavities with neat cement or sand-cement grout before excavation; (3) specify minimum 4,000 PSI concrete for all foundations — karst sites with variable bearing may experience differential settlement that demands higher-strength, stiffer concrete; (4) consider mat (raft) foundation designs for larger structures over karst to spread loads across a wider area and reduce differential settlement risk; (5) after construction, maintain positive site drainage away from the foundation permanently — water infiltration drives continued limestone dissolution. Lexington LFUCG Permits & Inspections may require a soils report for permits on lots in known karst-active zones.
How to Calculate Lexington Concrete Volume
📐 Lexington Concrete Volume 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 × 20 ft driveway × 4 in = 133.3 cu ft = 4.94 cu yd → Order 5.5 cu yd (+10%)
❄️ Lexington Freeze-Thaw & Cold Weather Pour Protocol — Kentucky Transitional Climate
Lexington sits in a transitional zone between humid subtropical and humid continental climate — winters are mild enough to pour most months but cold enough to require precautions from November through March. With 15–25 freeze-thaw cycles per year, air entrainment is worth specifying for all exterior work. For cold weather pours (when ambient temperature is below 40°F): (1) specify heated mix water (+$10–$16/yd) from your Lexington ready-mix supplier; (2) ensure concrete temperature is 55–70°F at placement; (3) never pour on frozen or frost-covered subgrade; (4) cover all exterior pours immediately with insulated curing blankets and maintain for 5–7 days minimum; (5) for interior basement floors in winter, seal all openings and use a propane or electric heater to maintain ambient temperature at 50°F+ for 7 days after pour. Lexington’s relatively mild winters compared to Louisville or Lincoln mean cold-weather concrete is manageable with basic precautions.
🌿 Lexington Summer Pour Protocol — Humid Bluegrass Heat
Lexington summers are characterized by high humidity (65–80% RH) combined with temperatures of 88–95°F from June through August. High humidity actually slows evaporation from concrete surfaces compared to dry-heat cities like Phoenix — but the combination of heat and humidity can accelerate set in the mix. For summer Lexington pours above 85°F: (1) schedule pours before 8 AM; (2) add set retarder to the mix (+$8–$12/yd) for any large pours over 5 cu yd; (3) wet forms and subgrade the night before; (4) apply evaporation retarder spray (Confilm) immediately after screeding each section; (5) apply white-pigmented curing compound within 30 minutes of final troweling; (6) moist-cure for 7 days minimum — Lexington’s warm, humid air helps maintain adequate moisture for curing without as aggressive management as in desert climates.
Lexington Concrete Pricing — Current Reference
Lexington and Fayette County are served by multiple ready-mix batch plants including facilities along I-64, I-75, and the New Circle Road corridor. Kentucky pricing is competitive mid-South — similar to Louisville, above Lexington’s rural surrounding counties. Georgetown, Nicholasville, Richmond, and Winchester carry comparable pricing. Short-load fees of $90–$170 apply for orders under 5–7 cu yd across Fayette County batch plants.
| Mix Type / PSI | Lexington Price / Cu Yd | National Avg | Best For | Air Entrained? | KY Code |
|---|---|---|---|---|---|
| 3,000 PSI | $133–$146 | $130–$148 | Interior slabs, basement floors | Not Needed (Interior) | Interior Only |
| 3,500 PSI + Air — Lexington Std. | $140–$155 | $138–$158 | Patios, sidewalks, general exterior flatwork | 4–6% Recommended | Compliant |
| 4,000 PSI + Air — Driveways/Structural | $148–$162 | $148–$166 | Driveways, foundations, karst-site structural | 4–6% Recommended | Recommended |
| 4,500 PSI — Structural | $158–$172 | $160–$175 | Grade beams, karst mat foundations, heavy loads | 4–6% Recommended | Compliant |
| 5,000 PSI — Commercial | $165–$188 | $172–$190 | Commercial, tilt-up, high-strength structural | As Specified | Compliant |
| Winter Heated Mix | +$10–$16/yd | +$10–$20/yd | All pours when temps below 40°F (Nov–Mar) | Separate | Recommended |
| Summer Set Retarder | +$8–$12/yd | +$8–$15/yd | Large pours when temps exceed 85°F (Jun–Aug) | Separate | Recommended |
3,000 PSI
Lexington Price / Cu Yd$133–$146
National Avg$130–$148
Best ForInterior slabs, basement floors
KY CodeInterior Only
3,500 PSI + Air — Lexington Standard
Lexington Price / Cu Yd$140–$155
National Avg$138–$158
Air Entrained4–6% Recommended
Best ForPatios, sidewalks, exterior flatwork
KY CodeCompliant
4,000 PSI + Air — Driveways / Structural
Lexington Price / Cu Yd$148–$162
National Avg$148–$166
Air Entrained4–6% Recommended
Best ForDriveways, karst-site foundations
KY CodeRecommended
4,500 PSI — Structural
Lexington Price / Cu Yd$158–$172
National Avg$160–$175
Best ForGrade beams, karst mat foundations
KY CodeCompliant
5,000 PSI — Commercial
Lexington Price / Cu Yd$165–$188
National Avg$172–$190
Best ForCommercial, tilt-up, high-strength
KY CodeCompliant
Winter Heated Mix
Cost per Cu Yd+$10–$16/yd
Use WhenAll pours below 40°F (Nov–Mar)
KY CodeRecommended
Summer Set Retarder
Cost per Cu Yd+$8–$12/yd
Use WhenLarge pours above 85°F (Jun–Aug)
KY CodeRecommended
Lexington Concrete Calculator — FAQ
How much does concrete cost per yard in Lexington, Kentucky?+
Lexington ready-mix runs $133–$188/yd depending on PSI and admixtures. The residential exterior standard — 3,500 PSI with 4–6% air entrainment — costs $140–$155/yd. For driveways and structural applications, 4,000 PSI air-entrained runs $148–$162/yd. Short-load fees of $90–$170 apply for orders under 5–7 cu yd. Winter heated mix adds $10–$16/yd from November through March. Summer set retarder adds $8–$12/yd for large pours when temps exceed 85°F in June through August.
What is karst limestone and why does it matter for Lexington foundations?+
Karst is a landscape formed by the dissolution of soluble limestone bedrock by slightly acidic groundwater over thousands of years. The resulting terrain features underground voids, fractures, and sinkholes — the same geology that created Mammoth Cave. Lexington sits on Ordovician Lexington Limestone Formation, which is actively dissolving at geological timescales. For foundations, karst means: the bedrock may be riddled with voids just a few feet below the surface that won’t support a footing. Always commission a Kentucky-licensed geotechnical engineer to conduct soil borings before pouring any Lexington structural foundation. GPR (ground-penetrating radar) surveys are an increasingly affordable option for pre-pour void detection.
Do I need air-entrained concrete in Lexington, KY?+
Air entrainment is strongly recommended — though not as critically mandatory as in Minneapolis or Lincoln — for all Lexington exterior concrete. With 15–25 freeze-thaw cycles per year, Lexington falls in ACI 318’s “Moderate” exposure category for most outdoor surfaces. Specify 4–6% air entrainment for all driveways, sidewalks, patios, and exposed flatwork. Interior slabs and basement floors do not require air entrainment. The cost premium for air-entrained mix is minimal ($5–$10/yd) and dramatically extends the service life of exterior Lexington concrete by preventing surface scaling during ice storms.
How deep do footings need to be in Lexington, Kentucky?+
All structural footings in Lexington must extend to at least 18 inches below finished grade — the frost depth for Fayette County per Kentucky’s adopted IBC. Most Lexington engineers specify 20–24 inches to provide a safety margin and ensure placement in competent bearing soil below the biologically active zone. On karst sites, footing depth is determined by the geotechnical report — footings may need to extend significantly deeper to reach competent, void-free limestone or stable residual soil above it. The Lexington-Fayette Urban County Government Building Inspection Division performs mandatory footing inspection before any concrete is placed.
When is the best time to pour concrete in Lexington, KY?+
The ideal Lexington concrete season is mid-March through May and September through November — mild temps of 55–75°F with moderate humidity provide excellent curing conditions. December through February requires cold-weather precautions (heated mix, insulated blankets) but is manageable. June through August requires early morning scheduling and evaporation management. Lexington’s transitional climate is actually one of the more accommodating in the eastern US for concrete work — the 18-inch frost depth and moderate freeze-thaw cycle count make it significantly less demanding than northern cities like Lincoln or Minneapolis while still requiring proper attention to both seasonal extremes.
Do I need a permit for concrete work in Lexington, Kentucky?+
Yes — Lexington-Fayette Urban County Government requires building permits for foundations, driveways connecting to public streets, retaining walls over 4 feet, and all structural concrete work. Apply through LFUCG Permits & Inspections. Foundation and footing inspections are mandatory before any concrete is poured. Small decorative patios that do not connect to the structure may be exempt below a certain square footage — verify directly with LFUCG before starting. On karst-flagged lots in Lexington, the city may require a soils investigation report as a condition of permit issuance for structural foundations.
What is Maury silt loam and how does it affect Lexington concrete projects?+
Maury silt loam is the official state soil of Kentucky and covers much of the inner Bluegrass region, including large portions of Fayette County. It is a well-developed, deep, moderately well-drained silt loam formed in residual material weathered from Ordovician limestone — the same karst bedrock beneath Lexington. It is moderately plastic (PI 10–20), slightly expansive, and has good bearing capacity when properly compacted. For Lexington concrete projects: compact native Maury silt loam to 95% Proctor at optimum moisture; place 4–6 inches of compacted crushed limestone (not sand) as sub-base; install vapor barrier for all interior and structural slabs. Properly prepared Maury silt loam provides a stable sub-base — the karst voids below it, not the soil itself, are Lexington’s primary structural risk.
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Official Lexington Concrete Resources
LFUCG permits, Kentucky Building Code, karst geology investigation, and Bluegrass soil standards for Fayette County concrete projects.
🏛️
LFUCG — Permits & Inspections
Permits & Inspections
Apply for Lexington-Fayette Urban County Government (LFUCG) building permits for driveways, foundations, retaining walls, and all structural concrete work. LFUCG Permits & Inspections enforces the Kentucky Building Code and performs mandatory pre-pour footing and foundation inspections. Karst-active zones in Fayette County may require a geotechnical investigation report as a condition of permit issuance. Verify contractor insurance and licensing credentials through the Kentucky Department of Housing, Buildings and Construction before signing any concrete contract.
Kentucky Dept. of Housing — Building Code
State Building Code
The Kentucky Department of Housing, Buildings and Construction administers the Kentucky Building Code (KBC), which governs all residential and commercial concrete construction in Lexington. The KBC is based on the International Building Code with Kentucky amendments and specifies minimum concrete strengths, frost protection requirements, and inspection protocols. Kentucky also licenses residential contractors through this department — verify that any Lexington concrete contractor holds a valid Kentucky contractor license before signing an agreement for structural work.
Kentucky Geological Survey — Karst Maps
Karst & Geology
The Kentucky Geological Survey (KGS) at the University of Kentucky publishes detailed karst hazard maps, sinkhole databases, and limestone bedrock geology data for Fayette County and the inner Bluegrass region. Use KGS resources to pre-screen your specific Lexington property for documented karst features, sinkhole history, or dissolution zones before commissioning a full geotechnical investigation. KGS also publishes guidance documents on building on karst in Kentucky — essential reading before pouring any Lexington structural foundation on a site with limestone bedrock near the surface.