THE CONSTRUCTION COLLECTION
Materials, measurements, HVAC and construction planning tools.
184 calculators · 2 topics
Browse calculators
Paint Calculator — free online calculator.
Tile Calculator — free online calculator.
Roof Pitch Calculator — free online calculator.
AC Tonnage Calculator The AC Tonnage Calculator estimates the cooling capacity an air conditioner needs for a space, in tons. It multiplies the floor area by an assumed cooling load per square foot and divides by 12,000 BTU/hr (one ton of cooling). Use it — free online calculator.
AC Tonnage Calculator The AC Tonnage Calculator estimates the cooling capacity an air conditioner needs for a space, in tons. It multiplies the floor area by an assumed cooling load per square foot and divides by 12,000 BTU/hr (one ton of cooling). Use it — free online calculator.
Roof Area Calculator — free online calculator.
Room Area Calculator — free online calculator.
Square Footage Calculator — free online calculator.
Tonnage Calculator — free online calculator.
Wall Square Footage Calculator — free online calculator.
Air Changes Per Hour (ACH) Calculator The Air Changes Per Hour (ACH) Calculator tells you how many times the entire volume of air in a room is replaced each hour by your ventilation. It uses the airflow rate and the room volume: ACH = (airflow in CFM × 60 — free online calculator.
Air Conditioner BTU Calculator The Air Conditioner BTU Calculator estimates the cooling capacity (in BTU/hr) needed to cool a room, based on its dimensions, climate, sun exposure and number of occupants. It also converts the result into tonnes of cooling — free online calculator.
Air Conditioner Room Size Calculator The Air Conditioner Room Size Calculator estimates the cooling capacity (in BTU/hr) a room needs from its floor area and a BTU-per-square-foot climate factor. As a rule of thumb, rooms need roughly 20 BTU/hr per square — free online calculator.
Aluminum Weight Calculator The Aluminum Weight Calculator finds the weight of a rectangular aluminum plate or bar from its length, width and thickness. Weight = volume × density, using aluminum's density of about 2.70 g/cm³. — free online calculator.
Angle Cut Calculator The Angle Cut Calculator finds the cut angle for a sloped piece from its rise and run, using the inverse tangent. It also returns the complementary angle. The formula used is: cut angle = arctan(rise ÷ run). — free online calculator.
Arch Arc Length Calculator The Arch Arc Length Calculator finds the curved length of an arch from its radius and the angle it spans. The formula used is: Arc Length = r × θ, where θ is the central angle in radians (degrees × π/180). — free online calculator.
Asphalt Calculator Estimate how much asphalt you need for a driveway, path or road from its length, width and thickness. The calculator works out the volume, then multiplies by the asphalt density to give the weight in kilograms and tonnes. Enter dimensio — free online calculator.
Baluster Calculator Calculate how many balusters are needed for a railing based on span, baluster width, and spacing code requirements. — free online calculator.
Bathroom Tile Calculator Estimate how many tiles you need to tile a bathroom floor and walls. Enter the floor dimensions, the wall height and perimeter, your tile size and a wastage allowance, and the calculator works out the floor area, wall area, total — free online calculator.
Beam Deflection Calculator Estimate the maximum deflection of a simply supported beam carrying a single point load at midspan. Enter the load, span, the material's Young's modulus and the section's moment of inertia, and the calculator returns the maximum — free online calculator.
Beam Load Calculator Find the maximum bending moment and support reactions for a simply supported beam carrying a uniformly distributed load (UDL). Enter the load per metre and the span, and the calculator returns the peak bending moment at midspan and th — free online calculator.
Beam Load with UDL and Point Load Calculator (Simple) Estimate the bending moment, shear force and deflection of a simply supported beam under a uniformly distributed load, a central point load, or both. Enter the span and loads to get the peak bending moment at midspan, the max — free online calcul
Bending Stress Calculator Calculate the maximum bending (flexural) stress in a beam using the flexure formula σ = M·c / I, where M is the bending moment, c is the distance from the neutral axis to the outer fibre, and I is the second moment of area. Enter — free online calculator.
Birdsmouth Cut Calculator Calculate the dimensions of a birdsmouth cut (seat cut and plumb cut) for a roof rafter based on roof pitch. — free online calculator.
Board And Batten Calculator Calculate the number of boards and battens needed for a board-and-batten siding or accent wall. — free online calculator.
Board Foot Calculator Calculate the total board feet of lumber for a project. Enter the thickness, width, length, and number of boards to get the total board footage — the standard volume unit used to price hardwood. — free online calculator.
Board On Board Fence Calculator Calculate materials for a board-on-board (shadowbox) privacy fence. — free online calculator.
Boiler Size Calculator Estimate the right boiler size in kW for your home from its floor area, insulation quality, and climate. Enter your house area and conditions to get a recommended boiler output with a safety buffer. — free online calculator.
Bolt Circle Calculator Lay out evenly spaced holes on a bolt circle. Enter the bolt circle diameter, number of holes, and starting angle to get the spacing between holes and the X–Y coordinates of each hole from the center. — free online calculator.
Bolt Torque Calculator Calculate the tightening torque for a bolt based on bolt size, grade, and friction coefficient. — free online calculator.
Bowl Segment Calculator Calculate the dimensions of wooden segments for turning a segmented bowl. Enter the ring diameter, number of segments, and stock thickness to get the segment length, width, and miter angle for each piece. — free online calculator.
Box Fill Calculator Calculate the minimum electrical box fill (volume in cubic inches) required by the NEC for wire conductors, devices, and clamps. Enter your conductor counts and devices to find the box volume you need. — free online calculator.
Brick Calculator Estimate how many bricks you need for a wall from its length and height, your brick size, and a wastage allowance. The calculator divides the wall area by the brick face area and adds your wastage percentage. — free online calculator.
Brick Wall Calculator Estimate the number of bricks and the mortar volume for a brick wall from its length, height, and thickness. The calculator works out the wall volume, applies a standard brick density, and adds a 5% wastage allowance. — free online calculator.
Bricks Calculator Popular Estimate how many standard bricks you need for a wall from its length, height, and thickness. The calculator uses the common figure of about 13.5 bricks per cubic foot (for a 9×4.5×3 inch brick with mortar) and adds a 5% wastage — free online calculator.
Cable Sag Calculator Calculate the sag of a cable or wire rope under its own weight using parabolic approximation. — free online calculator.
Carpet Calculator Work out how much carpet you need for a room. Enter the room length and width, the carpet roll width, and how much wastage to allow, and this calculator gives the area to order plus how many metres of roll you'll need. — free online calculator.
Caulk & Sealant Calculator Calculate how many tubes of caulk or sealant you need for a given joint length. — free online calculator.
Cement Calculator — free online calculator.
Cfm Calculator Calculate the required CFM (cubic feet per minute) of ventilation for a room based on volume and air changes per hour. — free online calculator.
Chicken Coop Size Calculator Calculate the minimum recommended chicken coop and run size based on flock size and breed. — free online calculator.
Clearance Hole Calculator: calculate resulting hole diameter (mm) from the supplied inputs.
Column Footing / Foundation Calculator — free online calculator.
Concrete Block / CMU Calculator — free online calculator.
Concrete Block Calculator Calculate the number of concrete blocks needed to build a wall. — free online calculator.
Concrete Block Fill Calculator Calculate the volume of concrete fill needed to grout and fill concrete masonry unit (CMU) block cores. — free online calculator.
Concrete Column Calculator — free online calculator.
Concrete Cylinder Calculator Calculate the volume of concrete needed to fill a cylindrical form such as a column, sonotube, or post hole. — free online calculator.
Concrete Driveway Calculator — free online calculator.
Concrete Driveway Cost Calculator — free online calculator.
Concrete Slab Calculator — free online calculator.
Concrete Stairs Calculator Calculate the volume of concrete needed to pour a set of exterior concrete stairs. — free online calculator.
Concrete Stairs Volume Calculator — free online calculator.
Concrete Tube Calculator Calculate the volume of concrete needed to fill a hollow tubular form (annular ring cross-section). — free online calculator.
Concrete Weight Calculator: calculate mass (kg) from explicitly entered values.
Countersink Depth Calculator Calculate the countersink hole depth needed for a flat-head screw based on head angle and diameter. — free online calculator.
Crushed Stone Calculator Calculate how many tons or cubic yards of crushed stone are needed for a project. — free online calculator.
Cubic Yard Calculator — free online calculator.
Deck Calculator — free online calculator.
Deck Stain Calculator Calculate how many gallons of deck stain are needed based on deck area and product coverage. — free online calculator.
Decking Calculator Calculate the number of deck boards needed based on deck dimensions and board width. — free online calculator.
Diy Shed Cost Calculator — free online calculator.
Door Header Size Calculator Determine the required header size for a door or window opening in a load-bearing wall. — free online calculator.
Drywall Calculator — free online calculator.
Electrical Load Calculator — free online calculator.
Elevation Grade Calculator — free online calculator.
Epoxy Calculator Calculate how much epoxy resin is needed for a countertop, floor, or river table project. — free online calculator.
Epoxy Flooring Calculator — free online calculator.
Fence Calculator — free online calculator.
Fence Cost Calculator — free online calculator.
Fence Estimate Calculator Estimate the total cost to install a fence based on linear footage, material type, and labor. — free online calculator.
Fence Material Calculator Calculate the lumber quantities for building a wood privacy fence including posts, rails, and pickets. — free online calculator.
Fence Perimeter Calculator — free online calculator.
Fence Picket Calculator Calculate the number of fence pickets needed for a given fence length and picket width. — free online calculator.
Fence Post Depth Calculator Calculate the required burial depth and total post length for a fence post. — free online calculator.
Fire Flow Calculator Estimate the required fire flow rate (GPM) for a building based on floor area and construction type. — free online calculator.
Fire Glass Calculator Calculate how many pounds of fire glass media are needed to fill a fire pit or fireplace burner tray. — free online calculator.
Floor Area Ratio (FAR) Calculator The Floor Area Ratio Calculator divides total building floor area by the lot area to give the FAR, a key zoning metric. Enter the total floor area and lot area. — free online calculator.
Floor Joist Calculator Calculate the number of floor joists needed for a room based on spacing and span. — free online calculator.
Flooring Calculator — free online calculator.
Flooring Cost Calculator — free online calculator.
Flow Rate (GPM) Calculator — free online calculator.
French Drain Calculator Calculate gravel volume and perforated pipe length for a French drain installation. — free online calculator.
Gallons Per Minute Calculator Calculate flow rate in gallons per minute from volume and time, or from pipe diameter and velocity. — free online calculator.
Gallons Per Square Foot Calculator — free online calculator.
Gambrel Roof Calculator Calculate gambrel roof area, rafter lengths, and materials for lower and upper roof sections. — free online calculator.
Glass Weight Calculator: calculate glass mass (kg) from explicitly entered values.
Gravel Calculator — free online calculator.
Gravel Driveway Calculator Calculate the amount of gravel needed for a driveway in tons and cubic yards. — free online calculator.
Grout Calculator — free online calculator.
Heat Loss Calculator — free online calculator.
Hole Volume Calculator: calculate excavation volume (m^3) from explicitly entered values.
Hoop House Calculator Calculate hoop house dimensions: cover area, volume, plastic needed, and hoop spacing. — free online calculator.
Insulation Calculator Calculate the amount of insulation needed and the required R-value for walls, attic, or floors. — free online calculator.
K Factor Calculator Calculate the K-factor for fire sprinklers (K = Q / √P) or sheet metal bending K-factor. — free online calculator.
Kitchen Backsplash Calculator — free online calculator.
Ladder Angle Calculator — free online calculator.
Limestone Calculator Calculate limestone volume and weight needed for a project area. — free online calculator.
Liters Per Minute Calculator Calculate flow rate in litres per minute from volume and time. — free online calculator.
Log Weight Calculator: calculate log mass (kg) from explicitly entered values.
Lumber Calculator — free online calculator.
Lumber Weight Calculator: calculate mass (kg) using defined numerical inputs.
Material Removal Rate Calculator — free online calculator.
Metal Plate Weight Calculator — free online calculator.
Metal Roof Cost Calculator — free online calculator.
Metal Roofing Sheet Calculator — free online calculator.
Metal Weight Calculator: calculate mass (kg) using defined numerical inputs.
Miter Angle Calculator Calculate miter angle for polygon frames, corner joints, and compound miters. — free online calculator.
Mortar Calculator — free online calculator.
Paint Calculator — free online calculator.
Parking Ratio Calculator The Parking Ratio Calculator expresses parking spaces per 1,000 square feet of building area, a standard commercial real-estate metric. Enter the number of spaces and the building area. — free online calculator.
Passive House Heating Demand Estimate passive house heating demand. Formula: Heat Loss (kWh/m²) = U-value × ΔT × hours / 1000. Reference for energy standard. — free online calculator.
Paver Calculator Calculate how many paving stones are needed to cover a patio or walkway. — free online calculator.
Paver Sand Calculator Calculate the amount of sand needed for a paver base bedding layer. — free online calculator.
Paving Calculator — free online calculator.
Pea Gravel Calculator Calculate the amount of pea gravel needed by area and depth. — free online calculator.
Picture Frame Matting Calculator — free online calculator.
Pipe Volume Calculator — free online calculator.
Pitch Diameter Calculator Calculate the pitch diameter of gears (by tooth count and diametral pitch) or threaded fasteners. — free online calculator.
Plywood Calculator — free online calculator.
Pond Volume Calculator — free online calculator.
Pool Volume Calculator — free online calculator.
Post Hole Concrete Calculator Calculate concrete needed to fill a post hole (annular cylinder around a post). — free online calculator.
Privacy Fence Calculator Calculate posts, rails, pickets, and concrete needed for a privacy wood fence. — free online calculator.
Punch Force Calculator — free online calculator.
Rafter Length Calculator — free online calculator.
Ramp Slope Calculator Calculate ramp slope, angle, run length, and ADA compliance for wheelchair ramps. — free online calculator.
Rebar Calculator — free online calculator.
Recessed Lighting Calculator Calculate recessed lighting spacing and layout. Determine optimal fixture count and spacing for room. — free online calculator.
Retaining Wall Calculator Estimate number of retaining wall blocks and cap blocks needed. — free online calculator.
Rip Rap Calculator Calculate volume and weight of rip rap (armor stone) needed for erosion control. — free online calculator.
River Rock Calculator Calculate volume and weight of river rock needed for landscaping. — free online calculator.
Rivet Size Calculator Calculate rivet grip length and nominal length for blind (pop) rivets. — free online calculator.
Road Base Calculator: calculate material mass (tonnes) using defined numerical inputs.
Rolling Offset Calculator Calculate rolling offset, true offset, and travel length for pipe or conduit routing. — free online calculator.
Roof Pitch Calculator — free online calculator.
Roof Shingle Calculator — free online calculator.
Roof Truss Calculator — free online calculator.
Roofing Calculator Calculate total roof area, roofing squares, shingles, and underlayment for a gable roof. — free online calculator.
Round Pen Calculator Calculate the number of panels, posts, and total circumference needed for a horse round pen. — free online calculator.
Rug Size Calculator — free online calculator.
Sand Calculator — free online calculator.
Shiplap Calculator Calculate the number of shiplap boards needed to cover a wall or ceiling. — free online calculator.
Siding Calculator — free online calculator.
Size To Weight Rectangular Cuboid Calculator: calculate mass (kg) using defined numerical inputs.
Snow Load Calculator — free online calculator.
Sod Calculator — free online calculator.
Soil Calculator — free online calculator.
Solar Panel Calculator — free online calculator.
Sonotube Concrete Calculator Calculate the volume of concrete needed to fill a cylindrical sonotube form. — free online calculator.
Spindle Spacing Calculator Calculate the number of spindles/balusters and exact gap between them to comply with IRC 4-inch rule. — free online calculator.
Spindle Speed Calculator — free online calculator.
Spiral Staircase Calculator Calculate number of steps, rotation per step, and tread width for a spiral staircase. — free online calculator.
Square Feet to Cubic Yards Convert an area in square feet with a given depth to cubic yards. — free online calculator.
Square Meter Calculator Calculate the area in square meters from length and width dimensions. — free online calculator.
Square Yard Calculator — free online calculator.
Square Yards Calculator Calculate the area in square yards from length and width dimensions. — free online calculator.
Stair Calculator — free online calculator.
Stair Carpet Calculator Calculate how much carpet you need to cover a staircase. — free online calculator.
Stair Rise and Run Calculator — free online calculator.
Stairs Calculator Calculate the number of steps, riser height, and tread depth for a staircase. — free online calculator.
Steel Pipe Weight Calculator — free online calculator.
Steel Plate Weight Calculator: calculate mass (kg) using defined numerical inputs.
Steel Weight Calculator — free online calculator.
Stone / Aggregate Calculator — free online calculator.
Stone Calculator Calculate volume and weight of natural stone needed for a project. — free online calculator.
Tank Volume Calculator — free online calculator.
Taper Calculator Calculate taper per foot, taper angle, and half angle for machined or fabricated tapers. — free online calculator.
Tariff Cost Calculator Calculate the additional tariff cost on an imported product based on declared value and tariff rate. — free online calculator.
Thinset Mortar Calculator — free online calculator.
Thread Calculator Calculate thread dimensions: pitch diameter, minor diameter, and thread depth for UN or metric threads. — free online calculator.
Thread Pitch Calculator Convert between threads per inch (TPI) and thread pitch (inches or mm). — free online calculator.
Tile Calculator — free online calculator.
True Position Calculator Calculate GD&T true position tolerance per ASME Y14.5: TP = 2√(Δx² + Δy²). — free online calculator.
Ventilation / ACH Calculator — free online calculator.
Vertical Curve Calculator Calculate parabolic vertical curve elevations for road design: y = PVC_elev + g₁x + (g₂−g₁)/(2L) × x². — free online calculator.
Vinyl Fence Calculator Calculate the number of vinyl fence panels, posts, and post caps needed. — free online calculator.
Vinyl Fence Cost Calculator — free online calculator.
Vinyl Siding Calculator Calculate vinyl siding squares, J-channel, and trim needed for a house. — free online calculator.
Wainscoting Calculator Calculate rails, stiles, panels, and moulding needed for wainscoting installation. — free online calculator.
Wall Framing Calculator Calculate studs and materials needed for wall framing (16 or 24 inch on-center spacing). — free online calculator.
Wall Plastering Calculator — free online calculator.
Wallpaper Calculator — free online calculator.
Water Tank Size Calculator — free online calculator.
Welding Calculator Calculate welding heat input and electrode/wire consumption for MIG, TIG, or stick welding. — free online calculator.
Window Size Calculator — free online calculator.
Wood Beam Span Calculator Estimate the maximum safe span for a wood beam based on size, species, and load. — free online calculator.
Wood Fence Calculator Calculate the total materials needed for a wood privacy fence including posts, rails, and pickets. — free online calculator.
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