Plan Concrete Yards, Bags & Project Quantities Across NYC
Use this Concrete Calculator in New York City, NY to estimate concrete for slabs, sidewalks, patios, driveways, pads, footings, piers and posts. Calculate cubic yards, cubic feet and cubic meters, add a project allowance, compare bag quantities and enter your own NYC ready-mix price for a simple material-cost estimate.
Estimate slabs and sidewalks, continuous footings, round piers/posts, or convert a known volume into bags and cost.
Estimate rectangular patios, pads, sidewalk sections, driveway areas and other flatwork.
Quantity estimate only. Public sidewalk, driveway, structural slab and building work may have specific NYC requirements beyond volume.
Estimate continuous footing, grade-beam or trench-fill volume.
Footing dimensions must follow approved design/project requirements. Earth-formed trenches can use more concrete than ideal geometry.
Calculate concrete for straight cylindrical piers, drilled holes and round post footings.
Straight-cylinder estimate only; structural piers and foundation elements require approved geometry and design.
Convert a known volume into cubic yards, cubic feet, cubic meters, bag quantities and optional price.
Verify bag yield and obtain a current supplier quote. NYC access, placement and delivery conditions can affect total project cost.
A Concrete Calculator in New York City is useful for everything from a backyard slab in Staten Island to a sidewalk repair in Queens, a footing in Brooklyn, a patio in the Bronx or building work in Manhattan. The geometry itself is universal, but project access, permits, concrete operations, sidewalk requirements and construction logistics can be unusually important in New York City.
The calculator above keeps the quantity math simple and transparent. It does not assume a single local concrete price or one universal slab thickness. Instead, it lets you enter the project dimensions and supplier quote that actually apply to your work.
Estimate flatwork in cubic yards from measured length, width and thickness.
Calculate continuous concrete runs for approved footing or grade-beam dimensions.
Calculate cylindrical pier or post-hole concrete and optional post displacement.
Use your own current supplier quote instead of a stale internet average.
Measure the concrete shape first. For a rectangular slab, multiply length by width by thickness. When thickness is entered in inches, divide it by 12 so all three dimensions are in feet. The result is cubic feet; divide by 27 for cubic yards.
Use actual formed, excavated or drawing dimensions.
Thickness, footing width and depth must be converted to feet.
Apply rectangular or cylindrical geometry.
Divide cubic feet by 27.
Use a field allowance appropriate to the actual project.
Use feet for length and width and inches for thickness.
One cubic yard contains 27 cubic feet.
Assumes a constant rectangular cross-section.
Convert diameter and depth to feet before calculating.
Flatwork is often the first thing users mean when searching for a concrete calculator in New York City. Private patios and pads use the same basic volume math as sidewalk panels, but the regulatory context can be very different.
NYC311 states that a contractor must obtain a DOT sidewalk construction permit before installing a new sidewalk or performing sidewalk repair associated with a violation. Public sidewalk work should therefore be planned around the applicable permit and inspection process rather than treated like an ordinary private backyard slab.
For quantity, measure only the actual replacement or new concrete area. If a sidewalk repair has several separated flags or sections, calculate each rectangle and add the volumes. If driveway portions have different thicknesses, calculate those separately instead of averaging them into one slab.
New York City Department of Buildings maintains a dedicated Concrete Permit page. For applicable permitted work, DOB explains that a permit may authorize work while excluding concrete operations until concrete requirements are met. The page references TR2, TR3 and concrete-subcontractor information as part of that process.
This matters because “I have a building permit” does not automatically mean every concrete operation can begin. The exact filing, inspection and testing requirements depend on the work scope and code provisions. Use the current DOB project record and project professionals to determine what applies.
For smaller work, NYC rules also contain categories of ordinary repair or minor work that may be exempt from a permit in certain circumstances. Do not assume an exemption from a calculator page; verify the actual scope under current NYC rules.
The NYC Department of Buildings lists the 2022 New York City Construction Codes as effective from November 7, 2022. The Building Code includes Chapter 19 for concrete along with structural, soils/foundations and construction-safety provisions that can affect concrete projects.
Use the applicable code edition and project filing requirements rather than relying on generic national guidance alone. NYC projects can also be affected by rules, bulletins, local laws, zoning and agency requirements outside the basic concrete-volume calculation.
NYC DOT regulates work in streets and sidewalks. NYC’s permit resources state that private contractors performing street or sidewalk construction must have a work permit. This is especially relevant when concrete work extends outside the private lot or affects public pedestrian or roadway space.
For sidewalk repairs, driveway approaches, curb work or street openings, review the current NYC311 Sidewalk Construction Permit guidance and NYC DOT permit resources before mobilizing.
Construction logistics also affect estimating. A small Manhattan pour with difficult truck access and a large Staten Island slab with direct chute access can have similar cubic-yard quantities but very different delivery and placement costs.
A curb cut is not simply a driveway slab detail in New York City. DOB regulates curb-cut projects and notes that proposed work must meet technical requirements. The City also requires DOT sidewalk and curb permits for the related work.
If a driveway project includes a new or modified curb cut, review the NYC DOB curb-cut guidance and applicable DOT requirements. The calculator can estimate concrete volume once the approved dimensions are known, but it cannot determine whether a curb cut is allowed or how wide it may be.
Footings for buildings, additions, walls and structural supports should be calculated from approved dimensions. Multiply total footing length by width and depth. Earth-formed footings may consume more concrete than the theoretical design cross-section because excavation is rarely perfectly straight.
NYC foundation work can involve soils, adjacent structures, underpinning, excavation support and special-inspection requirements that go well beyond volume. Use the calculator for quantity only after the design dimensions are established.
Round piers use cylindrical geometry. Enter diameter, depth and count. If a wood or metal post occupies the full entered depth, the calculator can subtract a simplified square or circular post volume.
Structural piers, deep foundations and drilled shafts are specialized engineering work. The round-hole mode is best for simple isolated geometry and material checks, not foundation design. For a dedicated pier workflow, use the Concrete Pier Size Calculator.
Bagged concrete can make sense for small repairs or isolated post holes. Larger work usually requires comparing ready-mix delivery with the labor of handling and mixing many bags. The calculator uses approximate planning yields of 0.30 ft³ for a 40 lb bag, 0.45 ft³ for a 60 lb bag and 0.60 ft³ for an 80 lb bag.
Always verify the exact product yield. If a project requires several cubic yards, logistics can dominate the decision: truck access, traffic, staging, pump location, hose distance, building access and crew placement rate all matter in New York City.
NYC concrete cost cannot be reduced to a reliable single number for every job. Material mix, strength, admixtures, quantity, truck waiting time, short-load charges, pumping, borough, access, traffic and scheduling can all change the delivered cost.
That is why the calculator leaves the price per cubic yard blank. Enter a current quote from the supplier or subcontractor that will actually serve the project.
This does not automatically include pump, labor, finishing, reinforcement, permits, testing or traffic-control costs.
New York City experiences both summer heat and winter freezing conditions. The National Weather Service’s New York office maintains Central Park climate normals and historical data showing the city’s broad seasonal temperature range.
Weather does not change the mathematical cubic yards, but it can change how the pour should be scheduled and protected. Hot, windy conditions can increase evaporation and reduce finishing time. Cold conditions can slow strength development and create freezing concerns. Rain or snow can affect excavation, subbase, formwork and access.
Coordinate trucks, crew and curing so concrete is not delayed during hot or humid conditions.
Plan cold-weather protection when freezing conditions are possible.
Weather, traffic and site access can combine to increase delivery and placement complexity.
| Area | 4 in | 5 in | 6 in | Purpose |
|---|---|---|---|---|
| 100 ft² | 1.23 yd³ | 1.54 yd³ | 1.85 yd³ | Volume comparison |
| 200 ft² | 2.47 yd³ | 3.09 yd³ | 3.70 yd³ | Volume comparison |
| 400 ft² | 4.94 yd³ | 6.17 yd³ | 7.41 yd³ | Volume comparison |
| 600 ft² | 7.41 yd³ | 9.26 yd³ | 11.11 yd³ | Volume comparison |
These values are geometry examples, not thickness recommendations.
The exact geometric result assumes perfect forms and excavation. Real projects can use more because of uneven subgrade, over-excavation, form tolerances, spillage, pump priming or concrete left in equipment.
The calculator defaults to 10%, but that percentage is editable and is not an NYC code requirement. A tightly formed slab may need a different allowance from an earth-formed footing or irregular repair.
Suppose a rectangular slab is 20 feet long, 10 feet wide and 4 inches thick. Area is 200 square feet. Four inches equals one-third of a foot, producing about 66.67 cubic feet. Dividing by 27 gives about 2.47 cubic yards before allowance.
With a 10% allowance, the planned quantity is about 2.72 cubic yards. Enter a current supplier quote to see a simple material-value estimate. The example does not determine whether 4 inches is the correct structural or sidewalk thickness.
Measure the actual section, convert inches to feet, calculate cubic feet and divide by 27.
Measure: use actual dimensions from the approved or intended work.
Convert: inches ÷ 12 before multiplying by feet.
Calculate: find cubic feet with the correct shape formula.
Order: divide by 27 for yards, then add your selected allowance.
Common questions about cubic yards, sidewalks, permits, piers, bags, costs and NYC concrete planning.