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Construction Calculators

Concrete, roofing, paint, lumber, and building tools. — 161 calculators available.

AC Tonnage Calculator
Estimates AC tonnage from area and a BTU/h per ft² cooling-load factor (1 ton = 12,000 BTU/h).
Air Changes per Hour Calculator
Calculates ACH from airflow in CFM and room volume in cubic feet.
Air Conditioner Room Size Calculator
Free online Air Conditioner Room Size Calculator. Quickly calculate and get instant results.
Aluminum Weight Calculator
Free online Aluminum Weight Calculator. Quickly calculate and get instant results.
Angle Cut Calculator
Computes miter cut angle as half of the included angle for two symmetrical pieces.
Angle of Depression Calculator
Calculates angle of depression from vertical drop and horizontal distance using arctangent.
Arch Calculator
Compute circular-arc radius, central angle, and arc length from span and rise.
Asphalt Calculator
Calculate asphalt tonnage needed.
Baluster Calculator
Estimate minimum balusters and spacing from rail length, baluster width, and max allowed gap.
Beam Deflection Calculator
Free online Beam Deflection Calculator. Quickly calculate and get instant results.
Beam Load Calculator
Calculate beam moment and shear forces.
Bending Stress Calculator
Free online Bending Stress Calculator. Quickly calculate and get instant results.
Birdsmouth Cut Calculator
Compute birdsmouth plumb cut depth and rafter pitch angle from roof pitch and seat cut run.
Board Foot Calculator
Free online Board Foot Calculator. Quickly calculate and get instant results.
Board and Batten Calculator
Free online Board and Batten Calculator. Quickly calculate and get instant results.
Board on Board Fence Calculator
Free online Board on Board Fence Calculator. Quickly calculate and get instant results.
Boiler Size Calculator
Size a boiler by converting design heat loss into required output and input using pickup factor and efficiency.
Bolt Circle Calculator
Compute bolt-circle radius, angular spacing, chord length, and coordinates for the next hole on a bolt circle.
Bolt Torque Calculator
Estimates bolt tightening torque using T = K × F × D (nut factor method).
Bowl Segment Calculator
Computes chord, arc, angle, and area for a circular (bowl) segment from radius and sagitta.
Box Fill Calculator
Free online Box Fill Calculator. Quickly calculate and get instant results.
Brick Calculator
Calculate number of bricks for a wall.
CFM Calculator
Computes required ventilation airflow (CFM) from room volume and desired air changes per hour (ACH).
Carbon Equivalent Calculator
Calculates IIW carbon equivalent: CEV = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15.
Carpet Calculator
Calculate carpet area and cost.
Cement Calculator
Free online Cement Calculator. Quickly calculate and get instant results.
Chicken Coop Size Calculator
Estimates indoor area, run area, nesting boxes, and roost length needed for a given flock size.
Clearance Hole Calculator
Estimates a recommended clearance hole diameter from fastener nominal diameter and desired fit (close/normal/loose).
Concrete Block Calculator
Free online Concrete Block Calculator. Quickly calculate and get instant results.
Concrete Block Fill Calculator
Free online Concrete Block Fill Calculator. Quickly calculate and get instant results.
Concrete Calculator
Calculate concrete volume needed for your project.
Concrete Column Calculator
Free online Concrete Column Calculator. Quickly calculate and get instant results.
Concrete Cylinder Calculator
Free online Concrete Cylinder Calculator. Quickly calculate and get instant results.
Concrete Driveway Cost Calculator
Free online Concrete Driveway Cost Calculator. Quickly calculate and get instant results.
Concrete Slab Calculator
Free online Concrete Slab Calculator. Quickly calculate and get instant results.
Concrete Stairs Calculator
Free online Concrete Stairs Calculator. Quickly calculate and get instant results.
Concrete Tube Calculator
Free online Concrete Tube Calculator. Quickly calculate and get instant results.
Concrete Weight Calculator
Free online Concrete Weight Calculator. Quickly calculate and get instant results.
Countersink Depth Calculator
Computes countersink depth from included angle and the major/minor diameters using standard cone geometry.
Crushed Stone Calculator
Estimates crushed stone volume and weight from area, depth, density, and waste percentage.
Cubic Yard Calculator
Calculates volume in cubic yards from length, width, and depth (ft/in inputs).
Deck Board Calculator
Calculate deck boards and materials.
Deck Stain Calculator
Free online Deck Stain Calculator. Quickly calculate and get instant results.
Decking Calculator
Free online Decking Calculator. Quickly calculate and get instant results.
Diy Shed Cost Calculator
Estimates DIY shed total cost from size, $/ft² rate, fixed add-ons, and a contingency percentage.
Door Header Size Calculator
Estimates required header section modulus and shear area from uniform load over a door opening span.
Drywall Calculator
Calculate drywall sheets needed.
Elevation Grade Calculator
Computes elevation change, grade %, slope ratio, and slope angle from start/end elevations and distance.
Epoxy Calculator
Calculates epoxy volume from area and thickness, adds waste, and splits into resin/hardener by mix ratio.
Fence Calculator
Calculate fence panels and posts needed.
Fence Cost Calculator
Free online Fence Cost Calculator. Quickly calculate and get instant results.
Fence Estimate Calculator
Free online Fence Estimate Calculator. Quickly calculate and get instant results.
Fence Material Calculator
Free online Fence Material Calculator. Quickly calculate and get instant results.
Fence Perimeter Calculator
Free online Fence Perimeter Calculator. Quickly calculate and get instant results.
Fence Picket Calculator
Free online Fence Picket Calculator. Quickly calculate and get instant results.
Fence Post Depth Calculator
Free online Fence Post Depth Calculator. Quickly calculate and get instant results.
Fire Flow Calculator
Estimates needed fire flow using an ISO-style area-based method with exposure, construction, and occupancy factors.
Fire Glass Calculator
Calculates fire-rated glass area, volume, weight, and estimated cost including waste allowance.
Floor Area Ratio Calculator
Compute floor area ratio (FAR) from total building floor area divided by lot area.
Floor Joist Calculator
Estimate joist quantity and total joist length from room size and joist spacing.
Flooring Calculator
Calculate flooring material needed.
Framing Calculator
Estimate studs and plate lumber for a wall from length, height, and stud spacing.
French Drain Calculator
Compute French drain trench volume (cu ft/cu yd) and pipe length from trench dimensions.
Ft2 Yd3 Calculator
Convert square feet and thickness (in) into cubic yards of material (with cu ft shown).
Furnace Size Calculator
Estimates required furnace output/input capacity from UA, infiltration (ACH), design temps, and safety factor.
Gallons per Minute Calculator
Computes flow rate in gallons per minute (GPM) from a measured volume over time.
Gallons per Square Foot Calculator
Calculates application rate (gal/ft²) and coverage (ft²/gal) from total gallons and area.
Gambrel Roof Calculator
Free online Gambrel Roof Calculator. Quickly calculate and get instant results.
Glass Weight Calculator
Free online Glass Weight Calculator. Quickly calculate and get instant results.
Gravel Calculator
Calculate gravel or fill material needed.
Gravel Driveway Calculator
Free online Gravel Driveway Calculator. Quickly calculate and get instant results.
Grout Calculator
Estimates grout volume and weight from tile size, joint width, thickness, area, grout density, and waste factor.
Heat Loss Calculator
Computes envelope + infiltration heat loss (BTU/hr) from UA, ACH, building volume, and indoor/outdoor temps.
Hole Volume Calculator
Calculates excavation volume for cylindrical, rectangular, or tapered holes, with optional waste factor.
Hoop House Calculator
Estimates hoop count and plastic cover area/film length for a hoop house based on span, length, and spacing.
Insulation Calculator
Calculate insulation materials needed.
Junction Box Sizing Calculator
Estimates minimum junction box volume using standard conductor fill allowances (NEC box-fill method, simplified).
K Factor Calculator
Computes thermal resistance R and transmittance U from thermal conductivity (k) and thickness (steady-state 1-D).
Ladder Angle Calculator
Calculates ladder angle and height reached from ladder length and base distance, plus recommended base distance per setu
Limestone Calculator
Estimate limestone volume and weight from area, depth, density, and waste factor.
Liters per Minute Calculator
Compute liters per minute from volume and time, with L/s and US GPM conversions.
Log Weight Calculator
Free online Log Weight Calculator. Quickly calculate and get instant results.
Lumber Calculator
Calculate lumber in board feet.
Lumber Weight Calculator
Free online Lumber Weight Calculator. Quickly calculate and get instant results.
Material Removal Rate Calculator
Calculate material removal rate from removed volume and elapsed time.
Metal Roof Cost Calculator
Free online Metal Roof Cost Calculator. Quickly calculate and get instant results.
Metal Weight Calculator
Free online Metal Weight Calculator. Quickly calculate and get instant results.
Miter Angle Calculator
Find the miter cut angle for two equal pieces forming a given corner angle.
Mortar Calculator
Free online Mortar Calculator. Quickly calculate and get instant results.
Mulch Calculator
Calculate mulch needed for landscaping.
Paint Calculator
Calculate how much paint you need.
Paver Calculator
Estimate pavers needed from area, paver size, joint width, and waste allowance.
Paver Sand Calculator
Free online Paver Sand Calculator. Quickly calculate and get instant results.
Pipe Volume Calculator
Calculates internal pipe volume from inner diameter and length.
Pipe Weight Calculator
Free online Pipe Weight Calculator. Quickly calculate and get instant results.
Pitch Diameter Calculator
Estimates thread pitch diameter from outside diameter and thread pitch (60° threads).
Plate Weight Calculator
Free online Plate Weight Calculator. Quickly calculate and get instant results.
Plywood Calculator
Free online Plywood Calculator. Quickly calculate and get instant results.
Pond Calculator
Computes pond surface area and water volume for rectangular, circular, or oval ponds.
Pool Calculator
Estimates pool volume using shape, surface dimensions, and shallow/deep depths.
Pool Volume Calculator
Calculate swimming pool volume.
Post Hole Concrete Calculator
Free online Post Hole Concrete Calculator. Quickly calculate and get instant results.
Privacy Fence Calculator
Free online Privacy Fence Calculator. Quickly calculate and get instant results.
Punch Force Calculator
Calculates sheet metal punching force using shear strength, thickness, perimeter, and safety factor.
Rafter Length Calculator
Compute sloped rafter length from span, roof pitch (rise/run), and overhang.
Ramp Slope Calculator
Free online Ramp Slope Calculator. Quickly calculate and get instant results.
Rebar Calculator
Calculate rebar needed for a concrete slab.
Retaining Wall Calculator
Free online Retaining Wall Calculator. Quickly calculate and get instant results.
Rip Rap Calculator
Estimate rip rap volume and weight from area, thickness, density, and waste allowance.
River Rock Calculator
Calculate river rock volume and weight needed from area, depth, density, and waste.
Rivet Size Calculator
Estimate rivet length from grip thickness plus shop-head allowance (typically ~1.5× diameter).
Road Base Calculator
Estimate road base volume (yd³) and tons from length, width, compacted depth, density, and waste.
Rolling Offset Calculator
Compute rolling offset (true diagonal) from two perpendicular offsets.
Roof Calculator
Calculate roofing materials needed.
Roof Pitch Calculator
Free online Roof Pitch Calculator. Quickly calculate and get instant results.
Roof Shingle Calculator
Free online Roof Shingle Calculator. Quickly calculate and get instant results.
Roof Truss Calculator
Free online Roof Truss Calculator. Quickly calculate and get instant results.
Roofing Calculator
Free online Roofing Calculator. Quickly calculate and get instant results.
Round Pen Calculator
Round pen circumference, area, and approximate number of panels from diameter.
Sag Calculator
Estimate arc radius and arc length from span and midspan sag (circular arc approximation).
Sand Calculator
Free online Sand Calculator. Quickly calculate and get instant results.
Sealant Calculator
Calculate required sealant volume and cartridge count from joint dimensions and length.
Shiplap Calculator
Estimate shiplap needed (linear meters) from wall size, board face width, and waste %.
Siding Calculator
Estimate net siding area and boxes needed from wall size, openings, waste %, and box coverage.
Size to Weight Rectangular Cuboid Calculator
Free online Size to Weight Rectangular Cuboid Calculator. Quickly calculate and get instant results.
Snow Load Calculator
Free online Snow Load Calculator. Quickly calculate and get instant results.
Soil Calculator
Calculate soil volume for garden beds.
Sonotube Calculator
Calculate concrete volume needed for round sonotube footings by diameter, height, and quantity.
Spindle Spacing Calculator
Compute equal gap spacing between spindles along a run, including end gaps.
Spindle Speed Calculator
Calculate spindle RPM from desired surface speed (SFM) and cutter diameter.
Spiral Staircase Calculator
Free online Spiral Staircase Calculator. Quickly calculate and get instant results.
Square Footage Calculator
Compute square footage from length and width, with optional quantity for multiple sections.
Square Meter Calculator
Calculate area in square meters from length and width.
Square Yard Calculator
Compute area in square yards from length and width in yards.
Square Yards Calculator
Calculate square yards from length and width in feet (includes ft² result).
Stair Carpet Calculator
Free online Stair Carpet Calculator. Quickly calculate and get instant results.
Staircase Calculator
Calculate staircase dimensions.
Stairs Calculator
Free online Stairs Calculator. Quickly calculate and get instant results.
Steel Plate Weight Calculator
Free online Steel Plate Weight Calculator. Quickly calculate and get instant results.
Steel Weight Calculator
Free online Steel Weight Calculator. Quickly calculate and get instant results.
Stone Calculator
Estimate stone volume and weight from area, depth, and material density.
Tank Volume Calculator
Compute tank volume for rectangular or cylindrical tanks (results in m³ and liters).
Taper Calculator
Compute taper ratio and angles from large/small diameters and taper length.
Thinset Calculator
Estimate thinset bags needed from tiled area, bag coverage, and waste allowance.
Thread Calculator
Approximate ISO metric 60° thread pitch and minor diameters from nominal diameter and pitch.
Thread Pitch Calculator
Calculate thread pitch (mm) and TPI from counted threads over a measured length.
Tile Calculator
Calculate number of tiles needed.
Tonnage Calculator
Compute volume and tonnage from dimensions and material density.
True Position Calculator
Computes true position tolerance result (diameter) from X and Y coordinate deviations.
Trump Calculator
Calculates area and perimeter for a rectangular section (placeholder for ambiguous 'Trump' term).
Vertical Curve Calculator
Computes key vertical-curve parameters from two grades and curve length (A, K, and A/L).
Vinyl Fence Calculator
Free online Vinyl Fence Calculator. Quickly calculate and get instant results.
Vinyl Fence Cost Calculator
Free online Vinyl Fence Cost Calculator. Quickly calculate and get instant results.
Vinyl Siding Calculator
Estimates vinyl siding panels needed from wall area, openings, panel coverage, and waste allowance.
Wainscoting Calculator
Estimates wainscoting area and number of panels from room perimeter, height, openings, panel width, and waste.
Wall Square Footage Calculator
Free online Wall Square Footage Calculator. Quickly calculate and get instant results.
Wallpaper Calculator
Calculate wallpaper rolls needed.
Welding Calculator
Estimates fillet weld throat, area, volume, and filler metal weight from weld length and leg size.
Wire Gauge Calculator
Calculate minimum wire gauge for electrical.
Wood Beam Span Calculator
Free online Wood Beam Span Calculator. Quickly calculate and get instant results.
Wood Fence Calculator
Free online Wood Fence Calculator. Quickly calculate and get instant results.