Toolwick — Construction Calculators

Order the right amount of material the first time. Toolwick's calculators cover the numbers every job needs — concrete yards, joist and header sizes, roofing squares, drywall sheets, wire gauge, duct sizes and more. Each one shows the formula it uses, a worked example, and the common mistakes that cost contractors money. Free, fast on a phone at the job site, and no signup.

127 free calculators

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Newest Calculators

Joist Spacing & Layout Calculator

Enter a floor or ceiling length and your on-center spacing (12, 16 or 24 in.) to get the joist count and layout marks, plus the end-bay distance.

Deck Beam Size Calculator

Size a deck beam and set post spacing from joist span, load and lumber grade. Shows single, double and triple 2x options.

Miter Angle Calculator

Get the exact miter and bevel saw settings for any corner angle, from trim and baseboard to picture frames and 5-, 6- or 8-sided builds.

Bathroom Remodel Cost Calculator

Estimate your bathroom remodel cost by size, fixtures, tile, vanity and labor, with a line-item budget for low, mid and high-end finishes.

Kitchen Remodel Cost Calculator

Budget a kitchen remodel by size and scope: cabinets, countertops, appliances, flooring, labor and contingency, with low-to-high ranges.

Cost to Build a House Calculator

Estimate new-home construction cost by square footage, finish level, stories, foundation type and region, with a line-item breakdown by trade.

Concrete, Masonry & Foundations

Bathtub & Shower Pan Mortar Bed Calculator

Calculate exactly how much mortar you need for a shower pan or bathtub mortar bed. Enter dimensions and get bags, cubic feet, and slope — free and instant.

Brick & Mortar Calculator

Calculate how many bricks you need for any wall or project. Free brick calculator — enter dimensions, get brick count, mortar quantity, and cost estimate instantly.

Cinder Block Wall Calculator

Calculate how many cinder blocks, mortar bags, and rebar you need for any wall project. Free cinder block wall calculator with instant results.

Concrete Bags Per Cubic Yard Calculator

Convert cubic yards of concrete into 40/60/80 lb bag counts by mix yield.

Concrete Patio Cost Calculator

Estimate concrete patio cost by size and thickness: ready-mix or bags, base, forms, finish and labor, with stamped and broom options.

Concrete Volume Calculator

Calculate concrete volume for slabs, footings, columns & more. Get instant cubic yards, cubic feet & bags needed. Free concrete calculator tool.

Deck Footing Size & Frost Depth Calculator

Determine deck footing diameter and depth based on load, soil bearing and local frost line.

Epoxy Garage Floor Coverage Calculator

Figure out how many epoxy kits, flake and topcoat you need for a garage floor, by square footage, coats and mil thickness.

Fence Post Spacing & Concrete Calculator

Calculate fence post count, spacing and concrete bags needed per post hole.

Footing & Foundation Size Calculator

Calculate the correct concrete footing and foundation size for any load. Enter soil bearing capacity, column load, and get footing dimensions instantly.

Garage Concrete Slab Thickness & Reinforcement Calculator

Calculate the ideal garage concrete slab thickness and reinforcement (rebar/wire mesh) based on vehicle load, soil type, and slab size. Free, instant results.

Masonry Chimney Flue Size Calculator

Calculate the correct masonry chimney flue size for your fireplace or stove. Enter firebox dimensions and get the required flue area instantly. Free chimney flue size calculator.

Masonry Wall Bond Pattern Generator

Generate brick bond patterns instantly. Calculate brick quantities, courses, and visualize running, Flemish, English, and stack bond layouts for any wall size.

Paver Patio Base & Sand Calculator

Calculate exactly how much gravel base, sand, and pavers you need for your patio project. Free paver patio calculator with material breakdown and cost estimate.

Paver Quantity Calculator

Count how many pavers or patio stones you need for any area. Enter paver size and joint width, add a waste factor, and get pieces and pallets.

Pedestal Paver Calculator

Calculate pedestals, spacers and pavers for a raised deck, roof or patio from area, paver size and height, with a waste allowance.

Rebar Spacing & Weight Calculator

Calculate rebar spacing, quantity, and total weight for concrete slabs, footings, and walls. Free rebar calculator with bar size charts and material estimates.

Retaining Wall Block Calculator

Calculate how many retaining wall blocks you need instantly. Enter wall dimensions and block size to get total blocks, rows, and material estimates.

Shed Foundation & Floor Joist Calculator

Calculate shed foundation type, floor joist size, spacing, and material quantities instantly. Free online shed foundation calculator for skids, piers, and slabs.

Sonotube & Round Column Concrete Calculator

Calculate concrete volume for sonotubes and round columns instantly. Enter diameter and depth to get cubic yards, bags needed, and cost estimates.

Thinset Mortar Coverage Calculator

Estimate thinset bags needed by tile size, trowel notch and square footage, with back-buttering and large-format tile allowances.

Framing & Structure

Board and Batten Wall Calculator

Plan board and batten walls: batten count, even spacing, board and batten lengths and total material, with a printable layout.

Deck Beam Size Calculator

Size a deck beam and set post spacing from joist span, load and lumber grade. Shows single, double and triple 2x options.

Deck Ledger Board Lag Bolt Calculator

Calculate exact lag bolt spacing for deck ledger boards. Enter deck dimensions and get IRC-compliant bolt patterns, quantities, and placement tables instantly.

Floor Joist Span & Size Calculator

Calculate floor joist span, size, and spacing for any room. Free floor joist span calculator with lumber grade, load, and deflection tables. Get results instantly.

Gable End Wall Area Calculator

Calculate gable end triangle area from span and pitch for siding, sheathing and house wrap, with trapezoid gable options.

Header Beam Size Calculator

Calculate the correct header beam size for doors, windows, and openings. Get recommended beam dimensions based on span, load, and lumber species instantly.

Joist Spacing & Layout Calculator

Enter a floor or ceiling length and your on-center spacing (12, 16 or 24 in.) to get the joist count and layout marks, plus the end-bay distance.

Knee Wall Stud Height & Attic Storage Calculator

Calculate knee wall stud height and usable attic storage area based on roof pitch, rafter span, and desired clearance. Free knee wall height calculator.

Lumber & Board Foot Calculator

Free board foot calculator for lumber. Enter thickness, width, and length to instantly calculate board feet, linear feet, and estimated cost for any wood project.

Plywood & Sheet Goods Cut Optimizer

Optimize your plywood cuts to minimize waste. Enter sheet size and required pieces to get the most efficient cutting layout. Free plywood cut calculator sheet optimizer.

Pocket Door Rough Opening & Cavity Calculator

Calculate the exact rough opening and wall cavity dimensions for any pocket door. Enter door size, wall type, and hardware specs for instant results.

Shower Wall Tile Calculator

Estimate tiles for shower walls. Enter wall sizes, subtract the door, niche, and valve openings, add a waste factor, and get the box count.

Stair Carpet Calculator

Estimate carpet or runner length for straight, winder and landing stairs from tread depth, riser height and step count.

Stair Stringer Calculator

Calculate stair stringer length, rise, run, angle, and cut dimensions instantly. Free stair calculator for deck, basement, and interior stairs.

Truss Span & Spacing Calculator

Calculate roof truss span, spacing, count, and load estimates instantly. Free online roof truss calculator for builders, contractors, and DIYers.

Window & Door Rough Opening Calculator

Calculate exact rough opening sizes for windows and doors instantly. Get framing dimensions, header sizes, and trimmer stud counts for any window or door project.

Roofing & Exterior

Asphalt Shingle Calculator

Estimate shingle bundles, squares, underlayment and nails needed for any roof size and pitch.

Deck Material & Cost Estimator

Calculate deck materials and costs instantly. Enter dimensions, choose decking type, and get a full lumber list with price estimates. Free deck material calculator.

Deck Railing & Baluster Spacing Calculator

Get code-compliant baluster count and spacing for any deck railing length and gap requirement.

Drip Edge & Roof Trim Calculator

Estimate linear feet of drip edge and trim pieces needed from roof perimeter dimensions.

Egress Window Size & Well Calculator

Calculate egress window minimum size, opening dimensions, and window well requirements to meet IRC building code. Free egress window size calculator.

Fence Material Calculator

Calculate exactly how much fence material you need — posts, rails, pickets, concrete & more. Free fence calculator for wood, chain link, and vinyl fences.

Ridge Cap Shingle Calculator

Estimate ridge and hip cap shingle bundles from ridge and hip length, with exposure and waste, for 3-tab and architectural caps.

Roof Attic Ventilation Calculator

Calculate required net free vent area (intake + exhaust) for your attic size per code ratios.

Roof Pitch & Rafter Length Calculator

Calculate roof pitch, rafter length, ridge height, and roof area instantly. Free online roof pitch calculator with visual diagram and step-by-step results.

Roof Replacement Cost Calculator

Estimate a re-roof price per square including tear-off, extra layers, steep pitch, underlayment and flashing, with a materials-versus-labor split.

Roof Underlayment Calculator

Calculate rolls of felt or synthetic roof underlayment from roof area, pitch and overlap, including starter and valley allowance.

Siding Calculator

Estimate vinyl, fiber cement, or wood siding squares and panels for your walls, minus windows and doors, gables, and waste.

Soffit & Fascia Material Calculator

Calculate exactly how much soffit and fascia material you need for your project. Enter dimensions and get instant material estimates, costs, and waste factors.

Drywall, Paint & Finishes

Baseboard & Crown Molding Material Calculator

Calculate exactly how much baseboard or crown molding you need for any room. Enter room dimensions, get linear feet, boards needed, and cost estimate instantly.

Bathroom Remodel Cost Calculator

Estimate your bathroom remodel cost by size, fixtures, tile, vanity and labor, with a line-item budget for low, mid and high-end finishes.

Bathroom Tile Layout Planner

Plan your bathroom tile layout instantly. Calculate tiles needed, cuts, grout, and cost with our free bathroom tile layout calculator. No signup required.

Ceiling Drywall Hanger Spacing & Load Calculator

Calculate ceiling drywall hanger spacing, load per hanger, and total hanger count for any room. Free ceiling drywall hanger spacing calculator with visual diagram.

Ceiling Texture Hopper Gun Air Compressor Calculator

Calculate the exact CFM and PSI your air compressor needs for ceiling texture hopper guns. Free ceiling texture compressor CFM calculator for any room size.

Dropped Ceiling Grid Material Calculator

Calculate exactly how many drop ceiling tiles, main tees, cross tees, wall angles, and hangers you need. Free drop ceiling material calculator with waste factor.

Drywall Calculator

Calculate exactly how many drywall sheets you need for any room. Free drywall calculator with waste factor, cost estimate, and screws/tape breakdown.

Drywall Installation Cost Calculator

Estimate drywall hanging and finishing cost by room size, board thickness and finish level: materials, labor and cost per square foot.

Drywall Screw Spacing & Quantity Calculator

Calculate exact drywall screw spacing and total screw count for any wall or ceiling project. Free online drywall screw spacing calculator for ceilings, walls, and edges.

Flooring Installation Cost Calculator

Estimate flooring installation cost by type (vinyl, laminate, hardwood, tile), including materials, labor, removal and subfloor prep.

Hardwood Floor Board Count & Waste Calculator

Calculate exactly how many hardwood floor boards you need with waste factor included. Free hardwood flooring calculator for any room size and board dimensions.

Joint Compound & Drywall Tape Calculator

Estimate buckets of joint compound and rolls of tape from drywall square footage and finish level (Level 3, 4 or 5).

Paint Coverage Calculator

Calculate exactly how much paint you need for any room or surface. Enter dimensions, choose coats, and get gallons needed instantly. Free paint coverage calculator.

Suspended Ceiling Load Capacity Calculator

Calculate suspended ceiling load capacity instantly. Enter grid spacing, hanger type, and load requirements to verify your ceiling system is safe and code-compliant.

Tile & Flooring Coverage Calculator

Calculate exactly how many tiles you need for any room. Enter room and tile dimensions, get tile count, waste factor, and total cost estimate instantly.

Tile Installation Cost Calculator

Estimate the installed cost of floor or wall tile with tile, thinset, grout, labor and prep, by room size and tile type.

Vinyl Plank Flooring Calculator

Calculate how many boxes of vinyl plank (LVP) you need, with waste for layout, cuts and room shape. Includes underlayment and cost estimate.

Wallpaper Coverage & Roll Calculator

Calculate how many wallpaper rolls you need for any room. Enter room dimensions, door/window cutouts, and roll specs to get an exact roll count with waste allowance.

Insulation

Blown-In Insulation Coverage Calculator

Calculate how many bags of blown-in insulation you need for any attic or wall. Enter your square footage, R-value, and insulation type to get an exact bag count.

Crawl Space Vapor Barrier Calculator

Calculate exactly how much vapor barrier plastic you need for your crawl space. Enter dimensions, get material quantities, overlap allowances, and cost estimates instantly.

Fiberglass Batt Insulation Calculator

Calculate batts or rolls of fiberglass insulation for walls, floors and attics by stud spacing, R-value and cavity depth.

Spray Foam Insulation Coverage Calculator

Calculate spray foam insulation coverage, board feet needed, and cost estimates for any project. Free spray foam insulation calculator with open & closed cell options.

Electrical & Lighting

Cable Tray Fill & Sizing Calculator

Calculate cable tray fill percentage and find the right tray size for your cables. NEC-compliant cable tray fill calculator for electricians and engineers.

Ceiling Recessed Lighting Layout Calculator

Calculate the perfect recessed lighting spacing and layout for any room. Get exact fixture positions, spacing recommendations, and a visual grid — free online tool.

Conduit Fill Calculator

Calculate conduit fill percentage instantly. Add multiple wire sizes, select conduit type and size, and get NEC-compliant fill results for EMT, PVC, and more.

Electrical Load & Circuit Breaker Calculator

Calculate electrical load, amperage, and recommended circuit breaker size instantly. Free online electrical load calculator for homes, workshops, and job sites.

Generator Size Calculator (Standby & Portable)

Size a standby or portable generator. Add up running and starting watts for your appliances and get the kW or kVA you need.

Generator Transfer Switch Load Calculator

Calculate the right generator size for your house. Add appliances, get total wattage, and find the perfect transfer switch size — free & instant.

Wire Gauge & Ampacity Calculator

Calculate wire gauge ampacity, find the right AWG wire size for your current load, voltage drop, and circuit type. Free online wire gauge ampacity calculator.

Plumbing & HVAC

BTU Heating & Cooling Load Calculator

Calculate BTU heating and cooling loads for any room size. Enter room dimensions, insulation, climate zone, and get accurate BTU requirements instantly.

Boiler BTU Output & Pipe Size Calculator

Calculate boiler BTU output and correct pipe size for hydronic heating systems. Free boiler pipe sizing calculator with flow rate, heat loss, and pipe diameter results.

Furnace Sizing Calculator

Estimate furnace BTU output needed based on square footage, insulation and climate zone.

HVAC Duct Size Calculator

Calculate HVAC duct size by CFM and velocity. Find the right round or rectangular duct dimensions for any airflow requirement. Free, instant results.

HVAC Refrigerant Line Set Size Calculator

Calculate the correct refrigerant line set sizes for your HVAC system. Get suction and liquid line diameters, insulation specs, and pressure drop estimates instantly.

HVAC Ventilation CFM Room Air Changes Calculator

Calculate CFM ventilation requirements and air changes per hour (ACH) for any room. Free HVAC tool for homeowners, contractors, and engineers.

Ice and Water Shield Calculator

Find how many rolls of ice and water shield you need for eaves, valleys and penetrations based on climate zone and wall overhang.

Mini Split Sizing Calculator

Find the right ductless mini-split BTU capacity for a room based on size, insulation and climate.

PEX Radiant Floor Heating Layout Calculator

Calculate PEX radiant floor tubing length, spacing, and layout for any room. Free tool for hydronic floor heating design — get accurate tubing estimates instantly.

Pipe Sizing & Flow Rate Calculator

Calculate pipe size, flow rate, velocity, and pressure drop instantly. Free pipe size calculator for water, HVAC, and plumbing — supports multiple pipe materials.

Septic Drain Field Size Calculator

Size a septic drain field from bedrooms or daily flow and soil percolation rate. Get trench length, total area and number of lines.

Septic Tank Size Calculator

Calculate the correct septic tank size for your home. Enter bedrooms, occupants, and daily water usage to get the recommended tank capacity in gallons.

Sump Pump Sizing Calculator

Calculate the right sump pump size for your basement. Enter pit dimensions, water inflow rate, and head height to get GPH/GPM requirements instantly.

Water Softener Sizing Calculator

Size a water softener by household size, water hardness (grains) and daily usage.

Site Work & Equipment

Excavation & Earthwork Volume Calculator

Calculate excavation volume, soil weight, and truck loads for any dig shape. Free online earthwork calculator for construction, landscaping, and civil projects.

Gravel Driveway Calculator

Calculate exactly how much gravel you need for your driveway. Enter dimensions and depth to get cubic yards, tons, and cost estimates instantly.

Scaffolding Material & Rental Cost Estimator

Estimate scaffolding materials, rental costs, and labor for any project. Enter dimensions and get a complete cost breakdown instantly. Free scaffolding calculator.

Welding Rod & Wire Consumption Calculator

Calculate welding rod and wire consumption for any weld joint. Get accurate estimates of electrodes, filler wire, and material costs for your welding project.