New Hampshire Concrete Calculator
New Hampshire Concrete Calculator — Yards, Bags & Cost
Calculate cubic yards, bags needed, and NH-accurate ready-mix costs for any New Hampshire concrete project — driveways, sidewalks, patios, foundations, footings & more.
🏔️ New Hampshire Concrete Calculator
Enter your project dimensions to calculate volume, bags needed, and estimated NH material cost.
Residential driveway: 6 in. min, 4,000 PSI air-entrained required statewide. NH building permit may be required.
Sidewalk 4 in · Driveway 6 in · Footing 12 in · Foundation 8–12 in
📋 Project Summary
💵 NH Cost Estimate
📐 New Hampshire Driveway Cross-Section — NH Standard Layers
4,000 PSI · Air-Entrained 5–7% · W/C Ratio ≤ 0.45
New Hampshire Concrete Calculator — What You Need to Know
New Hampshire is one of the most demanding states in the US for concrete durability. The Granite State experiences 40–80 freeze-thaw cycles per year in most regions, making air-entrained concrete (5–7% air) mandatory for any exterior flatwork. The NH Office of Professional Licensure and Certification (OPLC) oversees licensed contractors, while the NH State Building Code adopts the International Building Code (IBC) with local amendments. Most municipalities require a building permit for driveways, foundations, and structural concrete work — check with your local NH town office before starting.
🔵 NH Minimum Concrete Requirements — Exterior Work
Driveways & sidewalks: 4,000 PSI min, 5–7% air entrainment · Structural exposed to weather: 4,000–4,500 PSI · W/C ratio: max 0.45 · Frost depth: 48–60 in. (north), 36–48 in. (south). Never use calcium chloride accelerator in NH exterior concrete — it accelerates rebar corrosion under freeze-thaw conditions.
🚗 NH Driveway Concrete
A standard 20×20 ft NH two-car driveway at 6 inches requires ~7.4 cubic yards. At NH ready-mix prices ($168–$215/yd for 4,000 PSI), material alone costs roughly $1,240–$1,590. Full installed cost including labor, gravel base, and forming typically runs $5,500–$10,500 in NH.
🌲 NH Barn & Garage Floors
NH outbuilding floors are a top use case — barns, garages, and sheds often pour on granular fill over rocky NH soil. Use 4 in. at 3,500 PSI for storage-only floors, or 6 in. at 4,000 PSI for vehicle access. Vapor barrier under slab is strongly recommended in NH.
🏗️ NH Foundation & Footings
NH foundations must extend below the frost line — up to 60 inches in Coos County (North Country). Use 4,000–4,500 PSI with waterproofing admixture. NH building code requires a licensed engineer to stamp drawings for any structural concrete over certain dimensions.
How to Calculate Concrete Volume in New Hampshire
Start by measuring your project in feet (length and width) and depth in inches. Multiply length × width × (depth ÷ 12) to get cubic feet, then divide by 27 for cubic yards. For irregular shapes, break the area into smaller rectangles and add the volumes together. In NH, always add at least 10% waste — remote locations north of Concord can mean long wait times for a second delivery, and short-load fees quickly exceed the cost of the extra yard.
📐 New Hampshire Concrete Formula
⚠️ NH Short-Load Fees & Remote Delivery
Most NH ready-mix suppliers charge a short-load fee of $100–$200 for orders under 3–5 cubic yards. In northern NH (White Mountains, North Country), delivery surcharges of $50–$150+ apply for remote sites. For jobs under 0.5 cu yd, bagged Quikrete or Sakrete from local NH hardware stores (Aubuchon Hardware, Home Depot in Concord or Manchester) is far more practical.
New Hampshire Concrete Pricing — Current Reference
NH ready-mix pricing sits 10–30% above the national average due to New England labor rates, fewer competing batching plants outside Manchester and Concord, and the added cost of air-entraining admixtures required in this climate. Southern NH (Nashua, Manchester metro near MA border) is most competitive; northern NH commands the highest rates.
| Mix Type / PSI | NH Price / Cu Yd | National Avg | Best For | Air Entrained? | NH Code |
|---|---|---|---|---|---|
| 3,000 PSI — Standard | $148–$175 | $143–$158 | Interior slabs only — not for NH exterior | Not Sufficient | Interior Only |
| 3,500 PSI — Residential | $158–$188 | $153–$166 | Sheltered patios, garage floors | Recommended | Limited Use |
| 4,000 PSI — NH Standard | $168–$205 | $161–$173 | Driveways, sidewalks, exterior slabs | Required | Compliant |
| 4,500 PSI — Structural | $182–$220 | $171–$181 | Foundations, exposed structural work | Required | Compliant |
| 5,000 PSI — High Strength | $198–$240 | $178–$193 | Commercial, heavy load slabs | Required | Compliant |
| Fiber-Reinforced / Colored | $210–$265 | $160–$200 | Decorative driveways, stamped patios | Required | Compliant |
3,000 PSI — Standard
3,500 PSI — Residential
4,000 PSI — NH Standard
4,500 PSI — Structural
5,000 PSI — High Strength
New Hampshire Concrete Cost by Region
NH is divided into five main regions, each with distinct pricing driven by proximity to batching plants, population density, and delivery distance. The Nashua–Manchester corridor in southern NH has the most competitive rates due to proximity to Massachusetts suppliers. The North Country (Coos County) is the most expensive due to remoteness and low demand volume.
| NH Region | Key Cities / Areas | 4,000 PSI / Cu Yd | Frost Depth | Air Entrainment | Permit Required |
|---|---|---|---|---|---|
| North Country | Coos County, Berlin, Lancaster | $195–$240 | 48–60 in. | Required | Yes |
| White Mountains | Carroll County, Conway, Laconia | $182–$218 | 42–54 in. | Required | Yes |
| Lakes Region | Belknap County, Laconia, Meredith | $172–$208 | 42–48 in. | Required | Yes |
| Concord / Capital | Merrimack County, Concord, Keene | $168–$202 | 40–48 in. | Required | Yes |
| Southern NH | Hillsborough, Nashua, Manchester | $162–$195 | 36–44 in. | Required | Yes |
| Seacoast | Rockingham, Portsmouth, Exeter | $165–$198 | 36–42 in. | Required | Yes |
North Country — Coos County
White Mountains — Carroll County
Concord / Capital Region
Southern NH — Nashua / Manchester
Seacoast — Portsmouth / Exeter
✅ Verify Your NH Contractor Before You Pour
New Hampshire requires contractors performing concrete and construction work to be licensed. Verify your contractor's license through the NH Office of Professional Licensure and Certification at oplc.nh.gov. Always request proof of Workers' Compensation and general liability insurance before any work begins on your property.
New Hampshire Concrete Project Tips
- Air entrainment is non-negotiable in NH — 5–7% entrained air is required for all exterior concrete in New Hampshire. Without it, concrete will spall and flake within 1–2 winters due to the high number of freeze-thaw cycles.
- Set footings deep — very deep — frost depth in northern NH reaches 60 inches. All permanent structure footings must clear the frost line or they will heave and crack. Confirm local frost depth with your town building department.
- Never use calcium chloride in NH exterior concrete — it accelerates corrosion of rebar and wire mesh and reduces concrete durability in freeze-thaw climates. Use hot water, insulating blankets, or non-chloride accelerators in cold weather.
- Cure slowly in NH summers — summer temps in NH can spike to 90°F, especially in the southern tier. Pour early morning, cover with wet burlap, and keep moist for 7 days minimum. Sun and low humidity accelerate shrinkage cracking.
- Seal driveways every 2–3 years — NH towns use heavy road salt and sand. Seal with a silane/siloxane penetrating sealer after the 28-day cure and re-apply every 2–3 years to prevent salt and water penetration.
- Plan pours between May and September — NH concrete season is short. Below 40°F, ACI 306 cold-weather procedures apply. Most NH contractors avoid pours from November through March without heated enclosures.
- Order 10–15% overage for remote sites — if your project is north of Concord or in a rural area, add 15% waste. A second ready-mix truck call for 0.5 yards can cost $200–$300 in delivery and short-load fees alone.
- Use granular backfill under NH slabs — NH's rocky, clay-heavy soils drain poorly. A well-compacted 6-inch gravel base (NHDOT Item 304 or equivalent crushed stone) is essential to prevent slab settling and cracking from seasonal ground movement.
Frequently Asked Questions — New Hampshire Concrete Calculator
Official New Hampshire Concrete Resources
NH OPLC, NH DOT, and industry references for compliant concrete work in New Hampshire.
NH Office of Professional Licensure
Contractor LicensingVerify licensed NH contractors, look up disciplinary records, and confirm that your concrete contractor holds valid NH credentials before any work begins on your property.
Visit NH OPLCNH Department of Transportation
NHDOT StandardsNHDOT provides standard specifications for concrete construction on NH state roads, driveway access permits, and concrete mix design standards for public works projects statewide.
Visit NHDOTACI 318 & Cold-Weather Guide
ACI 306 Cold WxThe American Concrete Institute's ACI 306 guide covers cold-weather concrete practices essential for NH contractors. Proper insulation, heating, and mix design protect pours in NH's long winter season.
Visit ACI