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Building Systems· 22 calculators

Popular
Building Systems · Building Systems
2026 Solar Tax Credit Calculator
2026 Solar Tax Credit Calculator: apply section 25D only for a qualifying expenditure year and return zero after the ...
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★ Editor's pick
Building Systems · Building Systems
AC BTU Calculator
Estimate room air-conditioner BTU size from room area, ceiling height, sun exposure, occupants, and heat gains.
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Building Systems · Building Systems
EV Charger Load Calculator
EV Charger Load Calculator: convert volts and current to input power and apply the continuous-load sizing factor to c...
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Building Systems · Building Systems
Generator Size Calculator
Estimate generator running watts, starting watts, surge margin, and capacity fit from appliance load inputs.
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Building Systems · Building Systems
Heat Pump Vs Furnace Calculator
Heat Pump Vs Furnace Calculator: compare installed cost plus entered annual energy costs over one undiscounted horizon.
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Building Systems · Building Systems
Net Metering Savings Calculator
Net Metering Savings Calculator: value self-consumed solar at avoided retail price and exports at the applicable credit.
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Building Systems · Building Systems
Rainwater Harvesting Calculator
Estimate collected rainwater from roof area, rainfall, runoff efficiency, tank size, demand, and overflow.
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Building Systems · Building Systems
Septic Tank Size Calculator
Estimate septic tank capacity from bedrooms, design flow, retention time, safety factor, and local minimum size.
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Building Systems · Building Systems
Solar Battery Sizing Calculator
Solar Battery Sizing Calculator: gross up backed-up daily energy for autonomy, depth of discharge and round-trip effi...
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Building Systems · Building Systems
Solar Inverter Sizing Calculator
Solar Inverter Sizing Calculator: translate array DC nameplate into an AC inverter target using a selected DC-to-AC r...
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Building Systems · Building Systems
Solar Panel Size Calculator
Estimate solar system size, panel count, roof area, and offset from electricity use, sun hours, losses, and panel watts.
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Building Systems · Building Systems
Solar Payback Period Calculator
Solar Payback Period Calculator: divide net installed cost by annual bill savings net of recurring cost.
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Building Systems · Building Systems
Water Heater Size Calculator
Estimate tank first-hour rating, tankless flow rate, peak-hour demand, and temperature rise from hot-water uses.
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Building Systems · Building Systems
Demand Charge Calculator
Demand Charge Calculator: multiply applicable billing demand by tariff rate and billing periods.
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Building Systems · Building Systems
Generator Fuel Cost Calculator
Generator Fuel Cost Calculator: convert electrical energy demand to fuel through a measured kWh-per-fuel-unit efficie...
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Building Systems · Building Systems
Geothermal Payback Calculator
Geothermal Payback Calculator: compare incremental installed cost with entered annual energy savings net of recurring...
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Building Systems · Building Systems
Heat Loss Calculator
Free heat loss calculator using Q=UA∆T. Enter area, R-value, and indoor/outdoor design temperatures to get design hea...
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Building Systems · Building Systems
Home Energy Audit Savings Calculator
Home Energy Audit Savings Calculator: divide audited improvement cost by measured or modeled annual savings net of re...
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Building Systems · Building Systems
Solar String Sizing Calculator
Solar String Sizing Calculator: bound series-module count using cold open-circuit voltage and hot maximum-power voltage.
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Building Systems · Building Systems
Time Of Use Savings Calculator
Time Of Use Savings Calculator: compare avoided peak purchase with extra off-peak energy required after storage or sh...
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Building Systems · Building Systems
Wind Turbine Payback Calculator
Wind Turbine Payback Calculator: compare net installed cost with entered annual energy value minus recurring costs.
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Building Systems · Building Systems
Window U Factor Savings Calculator
Window U Factor Savings Calculator: convert the reduction in U-factor through window area and degree-hours into annua...
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Materials

Materials· 27 calculators

Popular
Materials · Materials
Aluminum Weight Calculator
Calculate aluminum weight with a sourced formula, guarded inputs, a worked example, and clearly stated scope.
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★ Editor's pick
Materials · Materials
Board Foot Calculator
Calculate board feet, waste-adjusted lumber volume, cubic equivalents, and cost from board dimensions.
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Materials · Materials
Brick Calculator
Estimate bricks, wall area, mortar-joint module, waste, and brick cost from wall dimensions and brick size.
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Materials · Materials
Concrete Volume Calculator
Free concrete calculator. Get cubic yards, bag counts, and cost for slabs, columns, and footings — with the standard ...
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Materials · Materials
Concrete Weight Calculator
Calculate concrete weight with a sourced formula, guarded inputs, a worked example, and clearly stated scope.
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Materials · Materials
Metal Weight Calculator
Calculate metal weight with a sourced formula, guarded inputs, a worked example, and clearly stated scope.
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Materials · Materials
Plywood Sheet Calculator
Estimate plywood or OSB sheet count, adjusted area, waste, sheets to buy, and material cost from project area.
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Materials · Materials
Rebar Calculator
Estimate rebar grid lines, total length, lap allowance, stock bars, steel weight, waste, and material cost.
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Materials · Materials
Square Footage Calculator
Calculate square footage for a rectangle or L-shaped room or house. Get sq ft, sq m, and a quick materials-cost estim...
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Materials · Materials
Steel Weight Calculator
Calculate steel weight with a sourced formula, guarded inputs, a worked example, and clearly stated scope.
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Materials · Materials
Board And Batten Calculator
Calculate board and batten with a sourced formula, guarded inputs, a worked example, and clearly stated scope.
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Materials · Materials
Concrete Estimator — Tube
Calculate annular concrete volume from outer diameter, inner diameter, and tube length in coherent metres with explic...
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Materials · Materials
Crushed Stone Calculator
Calculate crushed stone with a sourced formula, guarded inputs, a worked example, and clearly stated scope.
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Materials · Materials
Cubic Feet Calculator
Calculate volume in cubic feet, cubic meters, and cubic yards from length, width, and height in inches, feet, centime...
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Materials · Materials
Gambrel Roof Calculator
Calculate gambrel roof with a sourced formula, guarded inputs, a worked example, and clearly stated scope.
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Materials · Materials
Log Weight Calculator
Calculate ideal cylindrical log mass from measured diameter, length, and a user-sourced bulk density with explicit co...
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Materials · Materials
Lumber Cost Calculator
Estimate total lumber purchase cost from board dimensions, quantity, waste allowance, price per board foot, sales tax...
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Materials · Materials
Metal Roof Cost Calculator
Calculate material-only roof cost from measured roof area, an explicit waste percentage, and a supplied price per are...
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Materials · Materials
Room Size Calculator
Calculate room floor area, perimeter, and wall area from length, width, and wall height. Get the wall area you need f...
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Materials · Materials
Size to Weight Calculator (Rectangular Box)
Calculate rectangular-solid mass from three coherent metre dimensions and a user-supplied bulk or material density wi...
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Materials · Materials
Stone Calculator
Calculate stone with a sourced formula, guarded inputs, a worked example, and clearly stated scope.
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Materials · Materials
Thread Calculator
Calculate thread with a sourced formula, guarded inputs, a worked example, and clearly stated scope.
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Materials · Materials
Tonnage Calculator
Calculate tonnage with a sourced formula, guarded inputs, a worked example, and clearly stated scope.
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Materials · Materials
Fire Glass Calculator
Calculate fire glass with a sourced formula, guarded inputs, a worked example, and clearly stated scope.
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Materials · Materials
Limestone Calculator
Calculate limestone with a sourced formula, guarded inputs, a worked example, and clearly stated scope.
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Materials · Materials
Pitch Diameter Calculator
Pitch diameter calculator for ISO metric threads: d₂ = d − 0.6495P from major diameter and pitch, plus the external m...
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Materials · Materials
Thread Pitch Calculator
Calculate axial thread pitch in millimetres from threads per inch using the exact international inch with explicit co...
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Home Renovation

Home Renovation· 23 calculators

Popular
Home Renovation · Home Renovation
Baseboard Trim Calculator
Estimate baseboard linear feet, board count, waste, ordered length, spare trim, and material cost for each room.
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★ Editor's pick
Home Renovation · Home Renovation
Bathroom Remodel Cost Calculator
Bathroom Remodel Cost Calculator: assemble fixtures, finishes, demolition, trades, design and permit budgets before c...
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Home Renovation · Home Renovation
Carpet Square Footage Calculator
Calculate carpet square footage, square yards, linear roll length, waste, and project cost from room dimensions and r...
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Home Renovation · Home Renovation
Deck Stair Stringer Calculator
Calculate deck stair risers, treads, run, stringer length, spacing, and board count from deck height.
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Home Renovation · Home Renovation
Driveway Sealer Calculator
Estimate driveway sealer pails, coats, coverage, waste, gallons, spare coverage, and cost.
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Home Renovation · Home Renovation
Drywall Calculator
Estimate drywall sheets, waste, screws, tape, joint compound, and material cost from room dimensions and sheet size.
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Home Renovation · Home Renovation
Drywall Mud Calculator
Estimate drywall mud pails, gallons, coverage, waste, spare capacity, and cost from gypsum board area.
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Home Renovation · Home Renovation
Fence Post Concrete Calculator
Estimate concrete volume, bag count, post-hole displacement, waste, and cost for fence or deck post holes.
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Home Renovation · Home Renovation
French Drain Gravel Calculator
Estimate French drain gravel volume, cubic yards, tons, bags, pipe displacement, waste, and material cost.
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Home Renovation · Home Renovation
Gutter Size Calculator
Size gutters and downspouts from roof area, pitch, rainfall intensity, flow rate, and selected downspout capacity.
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Home Renovation · Home Renovation
Insulation Calculator
Estimate insulation area, R-value to add, package count, waste, and material cost for attics, walls, and floors.
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Home Renovation · Home Renovation
Kitchen Remodel Cost Calculator
Kitchen Remodel Cost Calculator: assemble cabinetry, appliances, labor, trades, design and permit budgets before cont...
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Home Renovation · Home Renovation
Laminate Flooring Calculator
Calculate laminate floor area, waste allowance, cartons, ordered coverage, spare flooring, and material cost.
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Home Renovation · Home Renovation
Paint Cost Calculator
Estimate paint gallons, primer, supplies, labor, total cost, and cost per square foot from area and coats.
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Home Renovation · Home Renovation
Retaining Wall Block Calculator
Estimate retaining wall blocks, courses, caps, base gravel, drainage aggregate, pipe length, and waste.
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Home Renovation · Home Renovation
Roofing Shingle Calculator
Calculate roof squares, shingle bundles, waste, and material cost from roof footprint, pitch, bundle coverage, and pr...
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Home Renovation · Home Renovation
Siding Calculator
Estimate siding square footage, squares, waste, cartons, and opening deductions from wall and gable measurements.
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Home Renovation · Home Renovation
Stair Calculator
Plan risers, treads, total run, stair angle, and code checks from total rise, target riser height, and tread depth.
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Home Renovation · Home Renovation
Tile Calculator
Estimate tiles, boxes, grout-adjusted coverage, waste, and cost from room area, tile size, grout width, and box cover...
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Home Renovation · Home Renovation
Wallpaper Calculator
Estimate wallpaper rolls from wall dimensions, roll width, roll length, pattern repeat, openings, and waste.
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Home Renovation · Home Renovation
Window Replacement Cost Calculator
Window Replacement Cost Calculator: combine window count, local installed unit price, trim or repair allowances and c...
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Home Renovation · Home Renovation
Basement Finishing Cost Calculator
Basement Finishing Cost Calculator: combine finishable area at a local installed rate with fixed project costs and co...
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Home Renovation · Home Renovation
Impact Fee Calculator
Impact Fee Calculator: apply user-entered per-unit and per-area schedules plus fixed charges.
home-renovation↗
Structural

Structural· 11 calculators

Popular
Structural · Structural
Beam Deflection Calculator
Work out how far a beam sags under load, check it against the IRC and IBC L/360 or L/240 deflection limit, and get th...
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★ Editor's pick
Structural · Structural
Beam Load Calculator
Turn floor or roof psf into the load on one beam. Tributary width, IRC live loads, end reactions, maximum moment and ...
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Structural · Structural
Floor Joist Calculator
What size floor joist you need, from NDS design values with the repetitive member factor applied. Checks bending, def...
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Structural · Structural
Foundation Footing Calculator
Foundation Footing Calculator: divide service load by locally approved allowable soil bearing pressure and show equiv...
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Structural · Structural
Rafter Length Calculator
Rafter cut length to the sixteenth, with the ridge deduction and the overhang measured along the slope. Common, hip a...
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Structural · Structural
Snow Load Calculator
Design roof snow load to ASCE 7-16: flat roof pf, sloped roof ps, the minimum load, and the total weight on your roof...
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Structural · Structural
Wind Load Calculator
Compute ASCE 7-22 velocity pressure and the design wind pressure on a building wall: exposure B, C or D, mean roof he...
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Structural · Structural
Wood Beam Span Calculator
How far a sawn or built-up wood beam can span, from NDS design values. Checks bending, deflection and shear and tells...
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Structural · Structural
Door Header Size Calculator
What size header a door or window opening needs. Runs the NDS 2018 bending, shear, sag and bearing checks and counts ...
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Structural · Structural
Roof Truss Calculator
How many roof trusses you need, plus the overall height, top chord and bottom chord to specify. Web lengths come from...
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Structural · Structural
Stud Count Calculator
Calculate how many wall studs you need from wall length, 16 or 24 inch on-center spacing, door and window openings, a...
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Electrical

Electrical· 8 calculators

Popular
Electrical · Electrical
Breaker Size Calculator
Size a non-motor branch circuit or feeder breaker: the NEC 125 percent continuous-load rule, then the next standard r...
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★ Editor's pick
Electrical · Electrical
Conduit Fill Calculator
Check raceway fill against NEC Chapter 9: 53, 31 and 40 percent limits, the 60 percent nipple rule, and the Note 7 ro...
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Electrical · Electrical
Electrical Service Load Calculator
Electrical Service Load Calculator: apply entered demand factor and planning margin to connected load for a prelimina...
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Electrical · Electrical
Wire Size Calculator
Size copper or aluminium wire against NEC Table 310.16 ampacity, temperature and bundling derates, termination limits...
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Electrical · Electrical
3 Phase Motor Amperage Calculator
Line current of a three-phase motor from its horsepower, voltage, efficiency and power factor — and the inverse, moto...
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Electrical · Electrical
DC Wire Size Calculator
Size 12V, 24V, 36V, 48V or 120V DC wire for a voltage-drop budget, with the NEC Table 310.16 ampacity as a floor. Ent...
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Electrical · Electrical
Generator Transfer Switch Calculator
Generator Transfer Switch Calculator: apply demand and margin to entered loads for a preliminary transfer-equipment c...
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Electrical · Electrical
Subpanel Sizing Calculator
Subpanel Sizing Calculator: apply entered demand factor and margin to connected branch loads as a planning check.
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Hvac