Free Online Calculators
Browse 69 calculators for construction, home projects, material quantities, costs, everyday arithmetic, and scientific math—with editable inputs, transparent formulas, and printable results.
Browse by category
Start with the project family that best matches the quantities or decisions you need to plan.
Concrete & Masonry
Plan slabs, footings, columns, driveways, reinforcing steel, mortar, and other concrete work with editable ordering assumptions.
Browse category 5 calculatorsMeasurement & Math
Measure project areas and volumes, total lumber, or handle everyday and scientific calculations with transparent results.
Browse category 19 calculatorsLandscaping & Yard
Estimate gravel, mulch, soil, sod, seed, fertilizer, drainage, irrigation, stone, and other landscape-project materials.
Browse category 21 calculatorsExterior Projects
Plan roofing, siding, framing, paving, fencing, decks, stairs, openings, excavation, and other exterior project quantities.
Browse category 18 calculatorsInterior Projects
Estimate paint, flooring, drywall, insulation, trim, cabinets, ceilings, HVAC planning, and other interior project quantities.
Browse categoryAll calculator tools
Every published BuildPlanCalc calculator in one crawlable directory.
Concrete Slab, Footing and Column Calculator
Estimate concrete for slabs, footings, pads, and columns; compare ready-mix with 40, 50, 60, and 80 lb bags.
Open calculator →MeasureSquare Footage Calculator
Add or subtract rectangular, circular, triangular, and trapezoidal areas with flexible measurement units.
Open calculator →MeasureCubic Yard Calculator
Calculate net volume for multiple rectangular, circular, triangular, or trapezoidal material zones.
Open calculator →LandscapingGravel Tonnage and Cost Calculator
Estimate gravel volume, compacted tonnage, bags, supplier minimums, delivery, and cost for multiple zones.
Open calculator →LandscapingMulch Calculator
Estimate bulk mulch, bags, minimum orders, delivery, and cost across multiple landscape-bed shapes.
Open calculator →InteriorRoom Paint and Primer Calculator
Estimate wall, ceiling, primer, and paint quantities for multiple rooms with doors and windows deducted.
Open calculator →ExteriorAsphalt Tonnage and Cost Calculator
Estimate compacted asphalt tonnage, supplier minimums, delivery, and cost for multiple paved shapes.
Open calculator →ExteriorFence Material and Cost Calculator
Estimate fence sections, post types, gates, rails, pickets, concrete, fasteners, and installed cost.
Open calculator →ExteriorDeck Board, Framing and Fastener Calculator
Estimate decking, joists, beams, posts, fascia, railing, stairs, and fasteners for a rectangular deck.
Open calculator →InteriorFlooring and Tile Calculator
Estimate cartons, pieces, underlayment, transitions, mortar, and grout for multiple rooms and shapes.
Open calculator →InteriorDrywall and Joint Materials Calculator
Estimate drywall sheets, screws, tape, compound, and cost for multiple rooms, layers, walls, and ceilings.
Open calculator →ExteriorRoofing Shingle, Pitch and Accessory Calculator
Estimate multiple roof planes, pitch, shingles, underlayment, ridge caps, starter, drip edge, nails, tear-off, and disposal.
Open calculator →LandscapingPaver Patio and Walkway Calculator
Estimate pavers, pallets, bedding sand, aggregate base, edge restraint, and editable material cost for patios and walkways.
Open calculator →LandscapingRetaining Wall Block and Base Calculator
Estimate segmental wall blocks, caps, aggregate base, drainage stone, and editable material cost for a uniform wall section.
Open calculator →ExteriorBrick and Concrete Block Calculator
Estimate masonry units and editable material cost for multiple walls after openings, joint dimensions, quantities, and waste.
Open calculator →ConcreteMortar Mix and Repointing Calculator
Estimate mortar bags and editable cost either from masonry-unit count or from repointing-joint volume.
Open calculator →ConcreteRebar Grid, Weight and Cost Calculator
Estimate slab-grid bar lines, stock lengths, reinforcing-steel weight, and editable material cost from spacing and cover.
Open calculator →MeasureLumber Board Foot and Linear Foot Calculator
Total board feet, cubic volume, linear feet, pieces, waste, and editable cost for multiple lumber sizes.
Open calculator →ExteriorWall Framing Stud and Sheathing Calculator
Estimate studs, plates, sheathing sheets, and editable material cost for multiple preliminary wall sections.
Open calculator →ExteriorSiding Squares, Cartons and Cost Calculator
Estimate siding area, squares, cartons, fasteners, accessories, and editable cost for walls, gables, and deductions.
Open calculator →InteriorInsulation Quantity and R-Value Planning Calculator
Estimate insulation layers, packages, loose-fill volume, and editable material cost for walls, ceilings, floors, and attics.
Open calculator →ExteriorGutter and Downspout Materials Calculator
Estimate gutter sections, downspout pieces, outlets, corners, end caps, preliminary rainfall flow, and editable material cost.
Open calculator →LandscapingTopsoil and Fill Dirt Calculator
Estimate compacted and delivered cubic yards, tons, truckloads, and editable material cost for multiple soil or fill zones.
Open calculator →LandscapingSod Quantity, Pallet and Cost Calculator
Estimate sod pieces, pallets, waste, and editable piece-versus-pallet cost for multiple lawn shapes and deductions.
Open calculator →LandscapingGrass Seed and Overseeding Calculator
Estimate grass-seed pounds, bags, and editable cost using product-label rates for new lawns or overseeding.
Open calculator →LandscapingLawn Fertilizer and Nutrient Calculator
Convert an editable nitrogen target and fertilizer analysis into product pounds, bags, nutrients applied, and material cost.
Open calculator →LandscapingRaised Bed and Garden Soil Blend Calculator
Estimate garden-bed volume, bulk yards, bags, blend components, and editable bulk-versus-bag cost.
Open calculator →ExteriorExcavation and Trench Volume Calculator
Estimate bank and loose excavation volume, weight, truckloads, and editable hauling cost for rectangular or trapezoidal cuts.
Open calculator →LandscapingFrench Drain Materials Calculator
Estimate trench excavation, drainage stone, perforated pipe, geotextile fabric, fittings, and editable material cost.
Open calculator →ExteriorStair Stringer, Riser and Tread Calculator
Plan stair risers, treads, run, angle, stringer length, stringer count, and tread material from measured rise and available run.
Open calculator →LandscapingSand Quantity, Weight and Cost Calculator
Estimate sand volume, weight, bags, bulk orders, and editable cost for bedding, masonry, play areas, or custom projects.
Open calculator →LandscapingLandscape Rock and River Rock Calculator
Estimate decorative landscape-stone volume, weight, bags, pallets, and editable cost across multiple bed shapes.
Open calculator →LandscapingFlagstone and Natural Stone Calculator
Estimate flagstone pieces, tons, pallets, joint allowance, base aggregate, and editable project cost.
Open calculator →LandscapingLandscape Edging, Stake and Connector Calculator
Estimate edging length, stock pieces, connectors, stakes, waste, and editable cost for straight and curved runs.
Open calculator →LandscapingPond Volume, Liner and Pump Planning Calculator
Estimate pond gallons, liner dimensions, liner area, and preliminary turnover flow for rectangular, circular, oval, or custom footprints.
Open calculator →ExteriorPool Volume, Fill Time and Water Cost Calculator
Estimate pool gallons, liters, fill time, and editable water cost for rectangular, circular, and oval pools.
Open calculator →LandscapingIrrigation Runtime, Water Use and Cost Calculator
Estimate sprinkler runtime, gallons, sequential zone time, and editable water cost from target depth and measured application rate.
Open calculator →LandscapingSprinkler Flow and Zone Calculator
Group editable sprinkler-head demands against available flow and reserve to estimate preliminary zone count.
Open calculator →InteriorWallpaper Roll and Pattern Repeat Calculator
Estimate wallpaper strips, usable strips per roll, rolls, net wall area, pattern-repeat waste, and editable cost.
Open calculator →InteriorCountertop Area, Slab and Cost Calculator
Estimate countertop and backsplash area, cutouts, exposed edge, product units, waste, and editable cost.
Open calculator →InteriorCabinet Layout, Quantity and Cost Calculator
Create a preliminary base-and-upper cabinet module count from wall runs, appliance gaps, fillers, corners, and editable costs.
Open calculator →InteriorBaseboard, Trim and Crown Molding Calculator
Estimate linear feet, stock pieces, waste, and editable cost for baseboard, door/window casing, chair rail, or crown molding.
Open calculator →InteriorDrop Ceiling Tile and Grid Calculator
Estimate ceiling tiles, cartons, main tees, cross tees, wall angle, hanger points, border cuts, and editable cost.
Open calculator →ExteriorStucco and Plaster Material Calculator
Estimate base- and finish-coat bags, lath area, accessories, waste, and editable material cost from multiple surfaces and deductions.
Open calculator →ExteriorWindow Replacement Quantity and Cost Calculator
Schedule replacement windows with perimeter flashing, foam, trim, editable material/labor rates, and transparent cost totals.
Open calculator →InteriorDoor Replacement Materials and Cost Calculator
Schedule interior, exterior, and sliding doors with slab/pre-hung options, casing, jamb, hardware, labor, and editable cost.
Open calculator →ExteriorRamp Slope, Run and Material Planning Calculator
Calculate ramp run, slope ratio, angle, landing allowance, surface area, and preliminary framing quantities from measured rise.
Open calculator →ExteriorDumpster and Construction Debris Calculator
Estimate debris volume, weight, selected-container loads, and preliminary dumpster options using editable bulk densities and provider limits.
Open calculator →InteriorRoom HVAC Load Planning Calculator
Build a transparent preliminary sensible heating or cooling load range from envelope, windows, infiltration, occupants, and internal gains.
Open calculator →InteriorVentilation and Airflow CFM Calculator
Estimate airflow by air changes per hour or direct source rate, plus preliminary round-duct area and diameter at an editable velocity.
Open calculator →ConcreteConcrete Driveway Material and Cost Calculator
Estimate driveway concrete, compacted base, reinforcement, forms, material quantities, and editable project cost.
Open calculator →LandscapingGravel Driveway and Road Base Calculator
Estimate compacted driveway aggregate volume, tonnage, truckloads, geotextile, and editable delivered cost.
Open calculator →ExteriorMetal Roofing Panel and Cost Calculator
Estimate exposed-width metal panels, ordered linear feet, underlayment, fasteners, trim, waste, and editable material cost.
Open calculator →InteriorCarpet, Padding and Installation Cost Calculator
Estimate net floor area, carpet order square yards, roll length, padding, waste, and editable material cost.
Open calculator →InteriorTile Grout and Thinset Calculator
Estimate approximate grout volume, grout bags, thinset bags, tile count, waste, and editable setting-material cost.
Open calculator →ExteriorPlywood and Sheathing Sheet Calculator
Estimate plywood or OSB sheets, layers, fasteners, cartons, waste, and editable material cost for multiple surfaces.
Open calculator →ExteriorDeck and Fence Stain Calculator
Estimate stain or sealer gallons, containers, cleaner, multiple coats, waste, and editable coating cost.
Open calculator →ExteriorCaulk and Joint Sealant Calculator
Estimate joint volume, cartridge yield, cartridges, backer rod, waste, and editable sealant project cost.
Open calculator →InteriorBoard and Batten, Wainscoting and Shiplap Calculator
Estimate decorative wall coverage, board or batten linear feet, stock pieces, waste, and editable material cost.
Open calculator →InteriorPipe Volume, Fill Time and Flow Calculator
Estimate internal pipe volume, gallons, weight of water, flow from velocity, or required flow for a target fill time.
Open calculator →ExteriorExterior House Paint and Primer Calculator
Estimate exterior wall paint, primer, containers, waste, and editable coating cost after subtracting doors and windows.
Open calculator →ConcreteFence Post Concrete and Bag Calculator
Calculate concrete around round or square fence posts, including total volume, 80 lb bags, waste, and editable material cost.
Open calculator →ConcreteSonotube and Round Column Concrete Calculator
Estimate concrete volume, ready-mix yards, bag quantities, and editable cost for solid or hollow round column forms.
Open calculator →InteriorBlown-In Attic Insulation Bag Calculator
Estimate added attic R-value, installed depth, product-label coverage, bags, waste, and editable insulation material cost.
Open calculator →LandscapingFire Pit Block and Paver Calculator
Estimate circular fire-pit wall blocks, caps, courses, aggregate base, waste, and editable material cost.
Open calculator →ExteriorShed Material and Cost Calculator
Build a preliminary shed takeoff for wall studs, floor, wall and roof sheets, siding area, roofing bundles, waste, and editable cost.
Open calculator →InteriorHome Renovation and Remodeling Cost Calculator
Combine editable renovation line items, contingency, design and permit allowances, tax, and uncertainty into a transparent planning range.
Open calculator →GeneralBasic Calculator
Add, subtract, multiply, divide, find powers or remainders, and calculate percentages with signed decimal numbers.
Open calculator →GeneralScientific Calculator
Calculate roots, powers, logarithms, exponentials, trigonometry, inverse trigonometry, reciprocals, factorials, and absolute values.
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