Proven Plaza Calculators & Open Data

Estimate ready-mix cubic yards or the number of 80 lb bags for a rectangular slab, patio or driveway. Formula: Cubic yards = Length(ft) × Width(ft) × Thickness(in)/12 ÷ 27 × (1 + waste%). Bags = cubic feet ÷ bag yield.

Concrete needed for round columns, piers and tube forms (sonotubes). Uses cylinder volume, which differs from slab math. Formula: Cubic feet = π × (diameter(in)/24)² × height(ft) × count; cubic yards = cu ft ÷ 27 × (1 + waste%).

Volume for continuous trench/wall footings where width is in inches and length runs the full perimeter. Formula: Cubic yards = Length(ft) × Width(in)/12 × Depth(in)/12 ÷ 27 × (1 + waste%).

Gallons of wall paint from room perimeter and height, minus doors and windows, for any number of coats. Formula: Paintable area = perimeter × height − 20 sq ft per door − 15 sq ft per window. Gallons = area × coats ÷ label coverage.

Roof area from the house footprint and pitch, converted to roofing squares (100 sq ft) and shingle bundles. Formula: Pitch factor = √(1 + (rise/12)²). Roof area = (L + 2×overhang) × (W + 2×overhang) × pitch factor. Squares = area ÷ 100 × (1 + waste%).

Number of drywall sheets for walls and optionally the ceiling. Formula: Sheets = (perimeter × height + ceiling area) × (1 + waste%) ÷ sheet area.

Square footage plus waste and number of boxes for tile, laminate, vinyl plank or hardwood. Formula: Area = L × W; to buy = area × (1 + waste%); boxes = to buy ÷ coverage per box.

Cubic yards (and optional tons) of mulch, gravel, sand or soil for a bed or path. Formula: Cubic yards = L(ft) × W(ft) × depth(in) ÷ 324 (since 27 cu ft × 12 in = 324). Tons = cu yd × supplier density.

Voltage drop for a single- or three-phase run using NEC Chapter 9 Table 8 conductor sizes. Formula: VD = 2 × K × I × L ÷ CM (single phase) or √3 × K × I × L ÷ CM (three phase); K = ohm·cmil/ft (approx. 12.9 Cu, 21.2 Al); CM from NEC Ch. 9 Table 8.

Room air-conditioner capacity using the ENERGY STAR sizing chart and its adjustments for sun, occupants and kitchens. Formula: Base BTU from the ENERGY STAR area chart; −10% heavily shaded, +10% very sunny, +600 BTU per person above 2, +4,000 BTU for a kitchen.

Number of deck boards for a rectangular deck, accounting for board width and gap. Formula: Rows = ⌈width(in) ÷ (board width + gap)⌉; boards = rows × ⌈deck length ÷ board length⌉ × (1 + waste%).

Posts, rails and pickets for a straight run of wood privacy or picket fence. Formula: Sections = ⌈length ÷ spacing⌉; posts = sections + 1 + gates; pickets = ⌈length(in) ÷ (picket width + gap)⌉.

Thickness needed to reach a target R-value for the R-per-inch printed on your insulation product. Formula: Thickness(in) = target R ÷ R per inch. Volume in board feet = area(sq ft) × thickness(in).

Gallons in a rectangular pool with a sloped bottom, using average depth. Formula: Gallons = L × W × (shallow + deep)/2 × 7.48052 gal/cu ft.

Gallons in a round or above-ground pool. Formula: Gallons = π × (D/2)² × average depth × 7.48052 (≈ D² × depth × 5.875).

Gallons in an oval (elliptical) pool. Formula: Gallons = π × (L/2) × (W/2) × average depth × 7.48052.

Panels needed to offset annual electricity use, from panel wattage, peak sun hours and system losses. Formula: Annual kWh per panel = W/1000 × peak sun hours × 365 × (1 − losses). Panels = ⌈annual use ÷ kWh per panel⌉.

Board feet and cost for hardwood or dimensional lumber. Formula: Board feet = thickness(in) × width(in) × length(ft) ÷ 12 × pieces (one board foot = 144 cubic inches).

Tons of hot-mix asphalt for a driveway or lot from area, compacted depth and mix density. Formula: Tons = L × W × depth(in)/12 × density(lb/cu ft) ÷ 2,000.

Number of risers and treads, exact riser height, total run and stringer length from the floor-to-floor rise, checked against the IRC 7¾ in maximum riser. Formula: Risers = ⌈total rise ÷ max riser⌉; riser height = total rise ÷ risers; treads = risers − 1; total run = treads × tread depth; stringer length = √(rise² + run²).

Common rafter length, ridge rise and roof angle from the horizontal run and pitch, with optional overhang. Formula: Pitch factor = √(1 + (rise/12)²). Rafter length = (run + overhang) × pitch factor. Ridge rise = run × rise ÷ 12. Angle = atan(rise ÷ 12).

Studs at 16 or 24 in on center for a wall length, plus extras for corners and openings, and linear feet of top and bottom plate. Formula: Studs on layout = ⌈length(in) ÷ spacing⌉ + 1; total = layout + corners × extras per corner + openings × extras per opening. Plate linear ft = length × plates.

Bricks for a single-wythe wall from its area, the brick face size and the mortar joint. Defaults are a modular brick with a ⅜ in joint. Formula: Bricks per sq ft = 144 ÷ ((length + joint) × (height + joint)); bricks = (wall area − openings) × bricks per sq ft × (1 + waste%).

Number of 8×8×16 concrete blocks (CMU) for a wall. A standard block plus a ⅜ in joint covers 16 × 8 in, so about 1.125 blocks per square foot. Formula: Blocks per sq ft = 144 ÷ ((length + joint) × (height + joint)) = 144 ÷ (16 × 8) = 1.125 for standard units; blocks = net wall area × 1.125 × (1 + waste%).

Number of pavers for a patio, walkway or driveway plus cubic yards of compacted base and bedding sand. Formula: Pavers per sq ft = 144 ÷ (paver length × width); pavers = area × per sq ft × (1 + waste%). Base and sand cubic yards = area × depth(in) ÷ 324.

Square feet of sod, number of pieces and pallets for a lawn area. Piece size and pallet coverage are editable because they vary by farm and grass type. Formula: Sq ft to buy = L × W × (1 + waste%); pieces = sq ft ÷ (piece length × width ÷ 144); pallets = sq ft ÷ pallet coverage.

Pounds and bags of pool salt to raise a saltwater pool from its current salt level to the target your chlorine generator needs. Formula: Salt (lb) = gallons × 8.34 lb/gal × (target ppm − current ppm) ÷ 1,000,000. Bags = ⌈lb ÷ bag size⌉.

Fluid ounces of liquid chlorine (sodium hypochlorite) to raise free chlorine by a target number of ppm, from pool volume and product strength. Formula: Available chlorine (g) = gallons × 3.78541 L/gal × ppm (mg/L) ÷ 1,000. Product (mL) = grams ÷ (strength% ÷ 100), since trade percent is grams of available chlorine per 100 mL. Fl oz = mL ÷ 29.5735.

What size generator you need for a power outage: add the running watts of everything you will run at once, then add the single biggest motor starting surge. Enter how many of each item you plan to run at the same time. Formula: Total running watts = Σ (quantity × running watts). Total starting watts = total running watts + the single highest additional starting watts among the items you run, because motors rarely start at the same instant. Amps at 240 V = running watts ÷ 240. Margin is an optional buffer you choose.

How much rebar a rectangular slab grid needs: bar count each way, lap splices, total linear feet, 20 ft sticks to order and steel weight from ASTM A615 bar weights. Formula: Bars each way = ⌊(clear span ÷ spacing)⌋ + 1, where clear span = side × 12 − 2 × edge clearance. A run longer than one stick needs ⌈(run − lap) ÷ (stick − lap)⌉ pieces, adding one lap per joint; lap = bar diameters × bar diameter. Linear ft = (bars × run + splices × lap) ÷ 12; sticks = ⌈linear ft × (1 + allowance) ÷ stick length⌉; weight = linear ft × ASTM A615 lb/ft.

How many retaining wall blocks you need for a straight wall or a circle (fire pit, tree ring), including the buried course, cap units, base gravel for the leveling pad and drainage rock behind the wall. Block sizes are editable because every product line differs. Formula: Buried depth = max(exposed height ÷ bury ratio, minimum). Courses = ⌈(exposed height + buried depth − cap height) ÷ block height⌉. Blocks per course = ⌈run ÷ block face length⌉, where run = wall length, or π × outside diameter for a circle. Wall blocks = ⌈blocks per course × courses × (1 + waste%)⌉; caps = ⌈run ÷ cap length × (1 + waste%)⌉. Base gravel cu yd = run(ft) × trench width(in) × base depth(in) ÷ 144 ÷ 27; drainage rock cu yd = run(ft) × zone depth(in) × stacked block height(in) ÷ 144 ÷ 27 (straight walls only).

Daily and yearly kWh and the cost to run any appliance from its wattage, hours of use and your electricity rate. Formula: kWh per day = watts × hours ÷ 1,000; kWh per year = kWh per day × days; cost = kWh × rate.

Check whether a gutter can carry the runoff from your roof in a design storm, and how many downspouts it needs. Uses the USDA NRCS gutter and downspout capacity table and your local rainfall intensity. Formula: Runoff Q (cfs) = roof area (sq ft) × rainfall intensity (in/hr) ÷ 43,200 (12 in/ft × 3,600 s/hr); gpm = cfs × 448.8. The gutter is adequate when Q ≤ its NRCS PA-1 capacity at your slope. Downspouts = the larger of ⌈Q ÷ one downspout's PA-1 capacity⌉ and ⌈run length ÷ max length per downspout⌉. Max roof area for the gutter = capacity × 43,200 ÷ intensity.

How much concrete solid steps need, from the total height to climb: number of risers, riser height, treads, top landing, cubic yards and 80 lb bags. Formula: Risers n = ⌈total rise ÷ max riser⌉; riser height R = total rise ÷ n. Side profile area = tread × R × n(n − 1) ÷ 2 + landing depth × n × R (each lower tread is a block of its own height; the landing sits at full height). Volume (cu ft) = profile (sq in) × width (in) ÷ 1,728; cubic yards = cu ft × (1 + waste) ÷ 27; bags = cu ft × (1 + waste) ÷ bag yield.

How much grout a tile job takes from the tile size, joint width, joint depth and area, in pounds and bags. The grout density is editable so you can match your product. Formula: Each tile plus its joint is a (L + J) × (W + J) module, of which J × (L + W + J) is joint. Joint share = J(L + W + J) ÷ ((L + J)(W + J)). Grout volume (cu ft) = area × joint share × depth(in) ÷ 12; pounds = volume × density × (1 + waste); bags = ⌈pounds ÷ bag size⌉.

How much attic ventilation you need by the 1/150 and 1/300 rules (Florida Building Code, Residential R806.2), split into intake and exhaust, and how many vents that is for your vent products. Formula: Total net free area (sq in) = attic floor area (sq ft) × 144 ÷ 150 (or ÷ 300 under the balanced exception). Exhaust NFA = total × high share; intake NFA = the rest. Vents = ⌈NFA ÷ the net free area of one vent (or one foot of continuous vent)⌉.

Minimum septic tank size, pump tank size and drainfield area for a single-family home under Florida Rule 62-6.008, from bedrooms, building area and soil type. Formula: Design flow = the larger of the bedroom flow (100 gpd per bedroom up to 4, then +60 per bedroom) and the building-area flow (100 gpd to 750 sq ft, 200 to 1,200, 300 to 2,250, 400 to 3,300, then +60 per extra 750 sq ft or fraction), per Table I and its footnote 4. Septic tank and pump tank minimums come from Table II for that flow. Drainfield area = max(flow, 200 gpd) ÷ the Table III loading rate for the soil and trench or bed.

How much baking soda raises your pool's total alkalinity, or how much muriatic acid or dry acid lowers it, for your pool size, using published doses per 10,000 gallons. Formula: Batches = |target − current| ÷ 10 × gallons ÷ 10,000. Raise: baking soda (lb) = batches × 1.4. Lower: muriatic acid 31.4% (fl oz) = batches × 26, or sodium bisulfate (lb) = batches × 2.1. Additions: raise no more than about 50 ppm at a time; add no more than 1 quart of acid per 10,000 gallons at a time.

How much stabilizer (cyanuric acid, CYA) raises your pool to a target level, or how much water to drain and refill to lower it. Formula: Raise: stabilizer (oz) = (target − current) ÷ 10 × gallons ÷ 10,000 × 13. Lower (dilution): share to drain = (current − target) ÷ (current − fill water); gallons = share × pool volume.

How much calcium chloride raises your pool's calcium hardness, or how much water to replace to lower it, based on your pool size and fill-water hardness. Formula: Raise: calcium chloride (lb) = (target − current) ÷ 10 × gallons ÷ 10,000 × 1.2 for 77% (0.9 for 100%). Lower (dilution): share to drain = (current − target) ÷ (current − fill water); gallons = share × pool volume.

Langelier Saturation Index for your pool or spa from pH, water temperature, calcium hardness and total alkalinity, using the factor table and formula in state pool rules, plus the pH that would balance it. Formula: SI = pH + TF + CF + AF − 12.1 (12.2 when TDS is above 1,000 ppm). TF, CF and AF come from the temperature, calcium hardness and alkalinity factor table; when a reading falls between rows the table method uses the next greater row. pH for SI = 0: 12.1 − TF − CF − AF.

Heater output in Btu per hour for an outdoor pool from surface area and temperature rise, using the U.S. Department of Energy formula, plus gas input, the matching standard heat pump size and the time to warm the water. Formula: Temperature rise = desired pool temperature − average air temperature of the coldest month of use. Heater output (Btu/h) = surface area × rise × 12 × rate factor (1, 1.5 or 2). Gas input = output ÷ efficiency. Heat to warm the water once = gallons × 8.34 lb × (desired − starting temperature); hours = that ÷ output, with no losses.

The flow rate (gpm) your pool pump must deliver for a target turnover time, your actual turnover from a flow meter reading, and whether your filter is big enough for that flow. Formula: Required flow (gpm) = gallons ÷ (turnover hours × 60). Actual turnover (hours) = gallons ÷ (measured gpm × 60). Filter max flow = filter area × rated gpm per sq ft.

Size a tankless water heater from your peak hot-water flow and the rise from winter inlet temperature to your setpoint: required Btu/h, gas input, electric kW and amps. Formula: Temperature rise = setpoint − inlet. Heat output (Btu/h) = gpm × 8.34 lb/gal × 60 min × rise. Gas input = output ÷ efficiency. Electric kW = output ÷ 3,412.14; amps = kW × 1,000 ÷ volts.

Required box volume under NEC 314.16 from your conductors, devices, clamps, fittings and grounds, checked against a standard metal box from Table 314.16(A) or your box's marked volume. Formula: Required volume = Σ(conductors × Table 314.16(B) allowance) + 1 allowance for clamps + 1 per fitting type + 2 per yoke + 1 for all grounds, each at the largest conductor size present. Allowances: 18 AWG 1.50, 16 AWG 1.75, 14 AWG 2.00, 12 AWG 2.25, 10 AWG 2.50, 8 AWG 3.00, 6 AWG 5.00 cu in.

Mortar for a brick or concrete block wall: units needed, cubic feet of mortar from the Brick Industry Association quantity table (with bond-pattern correction and waste) and bags of mason mix. Formula: Brick = wall ÷ 100 × Table 4 brick per 100 sq ft × (1 + bond brick factor). Mortar (cu ft) = brick ÷ 1,000 × Table 4 cu ft per 1,000 brick for the joint × (1 + bond mortar factor) × (1 + waste). Block = wall × 1.125. Bags = units ÷ units per bag × (1 + waste).

How many bags of thin-set mortar to buy for your tile area and trowel notch, from manufacturer coverage per 50 lb bag, with a conservative and a best-case count. Formula: Bags = area × (1 + allowance) ÷ coverage per bag, rounded up, at the low and high ends of the coverage range. Data-sheet coverage per 50 lb bag: 1/4 × 1/4 in 80–95 sq ft, 1/4 × 3/8 in 60–70, 1/2 × 1/2 in 35–40 (scaled for other bag sizes).

Check a public site robots.txt for AI crawler allow/deny verdicts.

Extract URLs from a public sitemap (follows sitemap indexes).

Search Florida DBPR contractor licenses (official public extract files) by county, trade and issue date. Business records only.

Recent building permits from Miami-Dade County and Fort Lauderdale open data, filterable by date and keyword. Owner names excluded.

Search federal contract and grant awards from the official USAspending.gov API by keyword, NAICS, state, date and amount.

Free 0-100 score of how easily AI assistants and agents can read, quote and contact a public business website: AI crawler rules, llms.txt, schema.org business/offer data, agent catalog, MCP card, sitemap, meta, contact. Not a Google ranking score.

Generate robots.txt AI-crawler rules, llms.txt, schema.org JSON-LD and /.well-known/agent-catalog.json from facts the business supplies. services: one per line as "Name|Price". Uses only supplied facts.

List offers in the agent GEO pack (ids + names + status). Read-only.

Takes no parameters.

Managed AI Front Office (flagship retainer) facts from pack JSON. HUMAN-GATED: recommend -> human Accept -> written scope -> pay. Agents must not purchase unsupervised.

Takes no parameters.

CustomLab.ai AI operations automation offer from pack JSON. No price, SKU or Payment Link; CTA is a free 30-minute fit call.

Takes no parameters.