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Construction
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Construction Calculators
Estimate materials, room dimensions, and project costs for residential and commercial construction.
All tools
99
🪨
Concrete Volume Calculator
Cubic yards of concrete for a rectangular slab/footing OR a cylindrical column/sonotube — with waste factor.
🧱
Concrete Bag Yield Calculator
Translate cubic feet of concrete into the number of pre-mix bags you need at 40, 60, or 80 lb per bag.
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Mortar Bag Yield Calculator
How many bags of mortar are needed for a given brick or block count? Uses standard mortar-per-brick consumption.
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Brick Count Calculator
How many bricks do you need for a wall? Enter dimensions, brick size, and joint thickness.
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Rebar Spacing & Quantity Calculator
Linear feet of rebar needed for a slab grid, given dimensions and on-center spacing.
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Gravel Volume Calculator
Cubic yards and tons of gravel for a driveway, base course, or landscape area.
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Sand Volume Calculator
Cubic yards and tons of sand for a base, paver bed, or sandbox.
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Mulch Volume Calculator
How many cubic yards or 2-cubic-foot bags of mulch do you need for a flowerbed or landscape area?
🪴
Topsoil Volume Calculator
Cubic yards and 40-lb bags of topsoil for a lawn renovation, garden bed, or fill area.
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Asphalt Tonnage Calculator
Tons of hot-mix asphalt for a driveway or parking area, given dimensions and lift thickness.
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Cement-Water Mix Ratio Calculator
How much water to add to a bag of cement for a target water-cement ratio (and matching aggregate volumes for a 1:2:3 mix).
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Crushed Stone Coverage Calculator
How many cubic yards or tons of crushed stone for a driveway base, French drain, or landscape.
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Interior Paint Quantity Calculator
Gallons needed — enter the wall area directly OR room dimensions (calculator subtracts doors/windows).
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Exterior Paint Quantity Calculator
Exterior coverage typically 250-300 ft²/gal — rougher surfaces, porous siding.
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Drywall Sheet Calculator
Sheets needed = wall area / sheet area (32 ft² for 4×8, 48 ft² for 4×12).
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Lumber Board Feet Calculator
Board-feet = (thickness in × width in × length ft) / 12 × pieces.
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Lumber Linear Feet Cost Calculator
Total = pieces × length × $/LF.
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Framing Stud Count Calculator
Studs needed = wall length / spacing + corners + 10% waste.
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Roofing Square Count Calculator
1 roofing square = 100 ft². Bundles = squares × 3 (for 3-tab) or × 4 (architectural).
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Shingle Bundle Count Calculator
Bundles = roof area / coverage per bundle (33⅓ ft² for 3-tab).
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Plywood Sheet Count Calculator
Sheets = surface area / 32 ft² (standard 4×8 sheet) + waste.
⬜
Ceiling Tile Count Calculator
Tiles = ceiling area / tile area, plus grid-feet for the suspended grid.
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Fence Material Calculator
Posts, panels, and rails for a wood/vinyl/chain-link fence.
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Deck Material Calculator
Decking boards, joists, posts, and fasteners for a residential deck.
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Flooring Material Calculator
Boxes/units of flooring needed = room area / box coverage + waste.
⬜
Square Footage Calculator (Rectangular)
Length × width = ft². The simplest area calc.
↳
L-Shape Square Footage Calculator
Two-rectangle L-shaped area = (L1×W1) + (L2×W2).
◧
Irregular Square Footage Calculator
Sum of rectangles. Enter length×width pairs (one per line).
🎨
Wall Area for Paint Calculator
Perimeter × ceiling height − doors and windows = paintable area.
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Ceiling Area Calculator
Ceiling area = floor area (for flat ceilings).
⬛
Floor Area Calculator
L × W = floor area in ft². For flooring orders, multiply by 1.10 (10% waste).
🌬️
Room Volume for HVAC Calculator
L × W × H = ft³. Used for air-change calculations and AC/heating sizing.
🏠
Attic Square Footage Calculator
Effective attic floor area accounting for sloped roof. Useful for insulation orders.
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Deck Square Footage Calculator
L × W = deck area. For decking material order, see deck-material.
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Patio Square Footage Calculator
L × W = patio area. For paver/concrete orders.
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Driveway Square Footage Calculator
L × W = driveway area. For asphalt, concrete, or gravel orders.
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Lawn Square Footage Calculator
L × W = lawn area. For seed, sod, fertilizer orders.
🏊
Pool Volume Calculator
Pool gallons = L × W × avg-depth × 7.48.
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Pond Volume Calculator
Same template as pool: L × W × avg-depth × 7.48 gallons. For garden ponds.
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Planter Volume Calculator
L × W × D = ft³ of soil needed for a raised bed or planter box.
❄️
BTU for Room Cooling Calculator
BTU/hr needed = ft² × climate factor (20-30 BTU/ft² for typical US climates).
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BTU for Room Heating Calculator
Heating BTU/hr = ft² × insulation factor × ΔT.
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AC Tonnage Calculator (sqft OR BTU input)
1 ton = 12,000 BTU/hr cooling. Convert sqft → tons (rule-of-thumb sizing) OR BTU → tons (direct).
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Furnace Size Calculator
Furnace BTU = ft² × climate-zone factor (30-60 BTU/ft²).
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Ductwork CFM Calculator
CFM (cubic feet per minute) = BTU/hr × 0.07. Used for sizing ducts.
🌡️
Heat Load Calculator (U-value method)
Heat loss = U × area × ΔT for each surface, summed.
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Dehumidifier Pint Capacity Calculator
Pints/day needed based on room ft² and humidity level.
Ω
Ohm's Law Calculator (Residential)
V = IR. Pick which to solve for. Residential circuit framing.
⚡
Wire Gauge for Amperage Calculator
NEC ampacity: typical residential AWG sizes for current load.
📉
Voltage Drop Calculator
Vd = (2 × K × I × L) / CM for single-phase circuits. NEC recommends ≤ 3% drop.
📈
ROI on Renovation Calculator
ROI = (post-value − pre-value − reno cost) / reno cost. Factor in regional appreciation to separate true ROI from market gains.
🍳
Kitchen Remodel Cost Calculator
Kitchen remodel cost = sq ft × $/ft² (basic / mid-range / luxury) + appliance package.
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Bathroom Remodel Cost Calculator
Bathroom remodel cost = sq ft × $/ft² (basic / mid / luxury) + fixture package.
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Deck Build Cost Calculator
Deck cost = sq ft × material rate. Pressure-treated, cedar, composite, and hardwood pricing built in.
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Fence Build Cost Calculator
Fence cost = linear feet × $/LF. Wood, vinyl, chain-link, aluminum rates.
🎨
Painting Cost Per Room Calculator
Painting cost = (wall + ceiling) ft² × $/ft² labor & materials. Interior or exterior.
🌡️
HVAC Replacement Cost Calculator
HVAC replacement cost = base price by tonnage × system type multiplier (AC, heat pump, furnace+AC).
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Roofing Replacement Cost Calculator
Roof replacement = squares × $/square (asphalt / metal / tile) + tear-off & disposal.
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Flooring Installation Cost Calculator
Flooring cost = sq ft × $/ft² (hardwood / tile / vinyl / carpet) + removal of existing.
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Contractor Markup Calculator
Invoice = (material + labor) × (1 + markup %). Standard residential markup is 15-25%; remodeling 20-30%.
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HELOC Payment Calculator
Home equity line of credit payment — interest-only during draw, amortizing during repayment.
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Construction Loan Payment Calculator
Construction loan: interest-only on disbursed balance during build, then converts to permanent mortgage.
⚖️
Renovation Loan vs Personal Loan Comparison
Side-by-side: secured renovation loan (lower rate, longer term) vs. unsecured personal loan (higher rate, shorter term).
📅
Contractor Payment Schedule Calculator
Distribute total contract across milestones (deposit / start / mid / completion) by % allocation.
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Project Cash Flow Calculator
Monthly cash flow = inflows (loan draws, owner contributions) − outflows (labor, materials) over project duration.
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Change Order Cost Impact Calculator
Revised total = base contract + change orders + contingency. Track scope creep against budget.
🔒
Holdback Amount Calculator
Holdback = total contract × holdback % (typically 10%). Released after lien period and punch list complete.
🛟
Project Contingency Calculator
Safe budget = base × (1 + contingency %). New construction 5%, remodels 10-15%, gut renos 20%+.
🚜
Equipment Rental Cost Calculator
Rental cost = best of (daily × days) vs. (weekly × weeks) vs. (monthly × months) — picks the cheapest tier.
⏳
Days to Completion (for Budget) Calculator
Days = remaining budget / daily burn rate. Works backward from spend to project schedule.
⚡
Breaker Size for Load
Required breaker amps = load watts × 1.25 / volts. NEC 80% derate rule.
💡
kWh Cost Per Month
Cost = W × hr/day × 30 / 1000 × $/kWh.
☀️
Solar Panel Count for Energy Needs
Panels = daily kWh need / (panel-W × sun-hours × derate / 1000).
🔌
Conduit Fill Calculator
NEC 40% fill (3+ wires). Find conduit size that holds N wires of given gauge.
💧
Water Pressure (Head Height to PSI)
PSI = ft of head × 0.433. Or 1 PSI = 2.31 ft of water column.
🚰
Pipe Diameter for Flow
D = 2 × √(GPM / (velocity × π × 144 × 7.481 / 60)). Find pipe size to deliver target GPM.
📐
Drain Pipe Slope
Slope (in per ft) × run length = total drop. Standard ¼" per ft.
🚽
Septic Tank Size by Bedrooms
IPC table: 750-1500 gal by bedroom count. State codes vary.
🚿
Water Heater Recovery Rate
GPH = (BTU/hr × efficiency) / (8.33 × ΔT). Hot water output rate.
⚙️
Pump Horsepower for Flow
HP = (GPM × ft head) / (3960 × pump efficiency).
📐
Square Footage Calculator (multi-shape + flooring)
Add up areas from up to 4 rectangles, triangles, and circles, then size the flooring order with waste + cost.
🏠
Roof Pitch Calculator
Convert between rise/run (X/12), degrees, and % slope — all three representations of the same roof angle.
🟦
Floor Tile Calculator (with pattern)
Tiles needed = (room area / tile area) × pattern-waste factor. Auto-rounds to whole tiles + box count.
🧻
Wallpaper Rolls Calculator
Standard double-roll coverage = 56 ft² (random match) / 50 ft² (straight match) / 38 ft² (drop match). Subtracts doors + windows.
🪜
Stair Stringer Calculator (rise/run/length)
From total rise + tread depth, compute riser count, individual rise, stringer length (Pythagorean), and IRC compliance check.
❄️
Air Conditioning BTU Calculator
Estimate the cooling BTU/h needed for a room from its area, occupancy, sun exposure, insulation, and climate, following ENERGY STAR sizing guidance.
🚿
Water Heater Sizing Calculator
Size a storage water heater by peak-hour hot-water demand (First Hour Rating) or size a tankless unit by peak simultaneous flow, using DOE worksheet values.
🧱
Stucco Coverage Calculator
Wall area + scratch/brown/finish coat thickness → bags of stucco mix needed (3-coat system).
🪣
Drywall Mud + Tape Calculator
Number of drywall sheets → joint-compound buckets and feet of tape for taping/finishing.
🟦
Tile Grout Calculator
Tile area + tile size + joint width + tile thickness → grout pounds needed.
🟫
Carpet Padding Calculator
Room area + padding type → padding rolls and total weight needed.
🪵
Hardwood Floor Plank Calculator
Room area + plank dimensions → plank count, boxes, and waste-adjusted purchase quantity.
🟨
Vinyl / Laminate Flooring Calculator
Room area + plank or sheet size → plank/sheet count, boxes, and waste-inflated purchase quantity.
🏠
Soffit & Fascia Calculator
House perimeter + roof overhang → linear feet of fascia and ft² of soffit material needed.
🧊
Insulation R-Value Recommended Calculator
US DOE climate zone + location (attic / wall / floor) → recommended R-value with cost-benefit context.
🪜
Decking Material Calculator
Deck size + board width + gap + joist spacing → deck boards, joists, beams, and screws/fasteners.
🏠
Roofing Shingle Calculator (Bundles + Nails)
Roof area + shingle type → bundles, nails, and starter strip with 10% waste built in.
💧
Concrete Water-Cement Ratio Calculator
Water + cement weights → w/c ratio and estimated 28-day compressive strength (Abrams' law).
🧱
Mortar Mix Calculator (Type N / S / M / O)
Mortar volume + ASTM C270 type → Portland cement, hydrated lime, and sand quantities by proportion.