Every construction calculator you need — in one place
Dozens of free calculators for concrete, gravel, mulch, framing, roofing, paint and more. Enter your measurements, buy the right amount. No signup — everything runs in your browser.
Concrete & Masonry Calculators
Slabs, footings, steps, blocks and rebar — volume, bags, blocks and steel.
Concrete Calculator
Slabs and pads: cubic yards and bag counts in seconds.
Open →Concrete Footing Calculator
Strip footings under walls: enter length, width and depth — cubic yards and bag counts, ready for the pour.
Open →Concrete Steps Calculator
Entry steps built from concrete: enter step count, width, tread and riser — get the total pour volume and bag count.
Open →Concrete Weight Calculator
Slabs, footings and countertops all have weight limits that matter: enter volume, get pounds and tons at standard concrete density.
Open →Concrete Mix Calculator
Enter the concrete volume you need — get 94-lb cement bags plus sand, gravel and water quantities for a 1:2:3 site mix.
Open →Concrete Block Calculator
CMU walls: enter the wall perimeter, height and openings — get the block count including waste, plus mortar estimate on the same page.
Open →Concrete Block Fill Calculator
Reinforced CMU walls need their cores filled with concrete or grout: enter the block count, get fill volume and bag equivalents.
Open →Block Mortar Calculator
Mortar planning: enter the block or brick count and get mortar bags plus the sand that goes with them.
Open →Rebar Material Calculator
Slab reinforcement: enter slab size and grid spacing — total linear feet of rebar for both directions, waste included.
Open →Rebar Weight Calculator
Pick a rebar size and enter total length — get pounds, for trailer loads, order totals and job costing.
Open →Concrete Reinforcing Mesh Calculator
Wire mesh and rebar grid layout for slabs: enter slab size and spacing for total reinforcement length in both directions.
Open →Quikrete Calculator
Bag counts for 80/60/40-lb concrete mix, any pour size.
Open →Gravel, Soil & Bulk Material Calculators
Order by the yard or the ton: gravel, stone, sand, topsoil, mulch and more.
Gravel Calculator
Cubic yards and tonnage for driveways, paths and bases.
Open →Mulch Calculator
Cubic yards and 2-cu-ft bag counts for beds, borders and tree rings.
Open →Sand Calculator
Cubic yards and tons for bedding, play sand and fill.
Open →Topsoil Calculator
Cubic yards and tons for new lawns, beds and leveling, with settling allowance.
Open →Soil Calculator
Filling low spots, building beds or backfilling: area and depth in — cubic yards and tons of soil out.
Open →Stone Calculator
Crushed stone for bases, drainage and decorative beds: dimensions and depth in — yards and tonnage out.
Open →River Rock Calculator
Decorative river rock: area and depth in — cubic yards and tons out, at real washed-stone density.
Open →Cement Calculator
Cement bags by volume and mix ratio.
Open →Driveway Calculators
Asphalt, concrete and gravel drives — depth, tonnage and sealer.
Asphalt Calculator
Tonnage for driveways and paving, by depth.
Open →Concrete Driveway Calculator
The one-and-done driveway pour: dimensions and thickness in — cubic yards, bag counts and the ready-mix call, out.
Open →Gravel Driveway Calculator
Driveway-specific gravel math: enter length, width and depth — tons to order from the quarry, compaction included in the guidance.
Open →Asphalt Sealer Calculator
Sealcoating math: driveway area in, sealer pails out — two coats, concentrated dilution accounted for in the guidance.
Open →Deck & Patio Calculators
Deck boards, balusters, stains, pavers and the base that goes under them.
Deck Board Calculator
Board counts and linear feet, waste included.
Open →Baluster Calculator
Railing runs: enter the rail length and baluster width — count and spacing that satisfies the 4-inch sphere rule.
Open →Deck Stain Calculator
Deck boards, railings and underside: enter deck size — stain gallons for two full coats, horizontal surfaces only.
Open →Paver Base Calculator
Crushed stone base tons for patios and walkways.
Open →Paver Calculator
Patio pavers by the piece: enter patio size, get the paver count for your pattern — plus the price math per square foot.
Open →Polymeric Sand Calculator
Paver joint sand: enter the paved area — pounds of polymeric sand at standard joint sizing, wide joints accounted for.
Open →Fence Calculators
Posts, pickets, stain and vinyl sections for the whole run.
Fence Calculator
The whole fence run in one calculation: total length in — post count, spacing and picket estimates out.
Open →Post Hole Concrete Calculator
Total bag count for any fence run, split per hole.
Open →Vinyl Fence Calculator
Vinyl fences build in 6 or 8-foot sections: enter the run — section count, line posts, corner and end posts out.
Open →Fence Stain Calculator
Fence stain math that counts both faces: run × height × two sides in — gallons out, sprayer-friendly.
Open →Flooring Calculators
Tile, flooring boxes, carpet yards and the linear-foot conversions.
Tile Calculator
Exact tile counts with pattern-based waste.
Open →Flooring Calculator
Laminate, vinyl and hardwood: room area in — boxes and total material cost out, waste allowance included.
Open →Carpet Calculator
Room dimensions and carpet price in — square feet, square yards and total material cost out.
Open →Linear Feet to Square Feet Calculator
Board lumber, fencing and counter edging are sold by the linear foot — convert to the square feet your project covers.
Open →Grout Calculator
Pounds of grout from tile size, joint width and area.
Open →Roofing Calculators
Shingles, sheathing, pitch, metal panels, snow load and ice shield.
Roofing Calculator
Squares and bundles from footprint and pitch.
Open →Roof Pitch Calculator
Rise and run in — pitch per 12, roof angle in degrees, the area multiplier and percent grade, all at once.
Open →Metal Roofing Calculator
Standing-seam and corrugated metal: footprint and pitch in — roof area, squares and linear feet of 36-inch panels out.
Open →Roof Sheathing Calculator
The roof deck under the shingles: footprint and pitch in — 4×8 plywood or OSB sheet count out, waste included.
Open →Ice & Water Shield Calculator
Ice-dam country roofs: eave perimeter and coverage width in — rolls of self-adhering membrane out.
Open →Roof Snow Load Calculator
Ground snow load from your local code in — flat-roof design load out, with the slope factor applied.
Open →Siding & Brick Calculators
Vinyl, clapboard, board & batten and brick veneer counts.
Siding Material Calculator
Whole-house siding estimate: perimeter, height and openings in — squares of siding out, gables noted.
Open →Vinyl Siding Calculator
Vinyl panels by the square: wall area in — squares, panel count and the J-channel and starter-strip quantities to ask for, out.
Open →Clapboard & Lap Siding Calculator
Lap siding exposure math: wall area in — squares and the course-by-course exposure layout, out.
Open →Board & Batten Siding Calculator
The farmhouse look, quantified: wall length in — board count and batten spacing out, gaps sized for wood movement.
Open →Brick Calculator
Brick walls and veneers: wall dimensions in — brick count, mortar and the waste allowance for cuts, out.
Open →Soffit Calculator
Soffit panels from eave run, depth and ventilation.
Open →Wall & Ceiling Calculators
Paint, drywall and wallpaper — walls, ceilings and openings accounted.
Paint Calculator
Gallons per room, coats and openings accounted.
Open →Drywall Calculator
Wall perimeter and height in — 4×8 sheets for walls and ceiling out, waste included.
Open →Wallpaper Calculator
Wall area and pattern repeat in — single and double rolls out, with the pattern-match allowance that saves the job.
Open →Carpentry Calculators
Studs, rafters, board feet, plywood, squares and cabinet doors.
Framing Calculator
Walls framed at 16 or 24 inches on center: wall length in — stud count out, corners and openings planned.
Open →Rafter Length Calculator
Half the building span and the roof pitch in — rafter length from wall plate to ridge, out.
Open →Board Foot Calculator
Thickness, width, length and quantity in — board feet out, the unit hardwood yards price by.
Open →Lumber Weight Calculator
Board feet in — pounds out, using per-species densities from pine's 2.9 lbs/bd ft to oak's 4.7.
Open →Plywood Calculator
Area in — 4×8 plywood or OSB sheets out, with the 10% waste for cuts and panel breaks.
Open →Check Square Calculator
Any two sides of a corner in — the diagonal that proves it's a perfect 90 degrees, out.
Open →Trim & Molding Calculator
Total wall length in — baseboard, crown or casing pieces out, with the 10% that miter cuts eat.
Open →Wainscoting Layout Calculator
Wall length in — even board-and-batten wainscoting rhythm out, gaps adjusted so the ends land clean.
Open →Cabinet Door Calculator
Opening dimensions in — finished door sizes for full-overlay and inset hinges, out.
Open →Lawn & Garden Calculators
Seed, sod, mulch beds, pools, retaining walls and mowing time.
Grass Seed Calculator
New lawns and overseeding: enter the area — pounds of seed at the seeding rate for your grass type.
Open →Lawn Mowing Calculator
Lawn care pricing and planning: area in — mowing time and what to charge per visit, out.
Open →Plant & Flower Calculator
Bed area and plant spacing in — the number of flowers, shrubs or ground-cover plants to buy, out.
Open →Sod Calculator
New lawn in a day: area in, rolls and pallets out, with cutting allowance.
Open →Sod Weight Calculator
Sod is heavy: enter the area — total weight in pounds and tons, and how many pickup loads it really is.
Open →Pool Volume Calculator
Rectangular or round pools: dimensions in — gallon volume out, for chemical dosing, pump sizing and refills.
Open →Retaining Wall Calculator
Retaining wall length and height in — block count, cap blocks and the gravel backfill volume behind them, out.
Open →Acreage Calculator
Measure any rectangular lot by length and width — square feet, acres and square meters side by side.
Open →Elevation Grade Calculator
Rise over run in — slope as percent, angle and the 1:X ratio that drainage plans use, all at once.
Open →Measurement & Conversion Calculators
Cubic and square conversions, fractions, scales and tank volumes.
Cubic Feet Calculator
Length, width and height in any consistent unit — volume in cubic feet plus yard, meter and inch equivalents.
Open →Cubic Inches Calculator
Dimensions in — volume in cubic inches with cubic feet and liters alongside, for engines, enclosures and appliances.
Open →Cubic Meters Calculator
Metric dimensions in — cubic meters with cubic feet, yards and liters alongside, for international specs.
Open →Cubic Yards Calculator
Dimensions in — cubic yards with feet and meters alongside, the unit every mulch, gravel and concrete order speaks.
Open →Cubic Yards to Tons Calculator
Cubic yards and material density in — tons out, with the densities that quarries actually use.
Open →Cylinder Cubic Footage Calculator
Diameter and length/height in — cubic feet, yards and gallons of any cylinder: tanks, tubes, round planters and footings.
Open →Cylinder Cubic Yardage Calculator
Round columns and caissons: diameter and depth in — cubic yards of concrete out, the unit the truck delivers in.
Open →Square Footage Calculator
Length and width in any unit — square feet, square yards and square meters out, for rooms, homes and listings.
Open →Square Inches Calculator
Length and width in inches — square inches with square feet alongside, for panels, vents, prints and cut lists.
Open →Square Meters Calculator
Metric dimensions in — square meters with square feet alongside, for international plans and product specs.
Open →Square Yards Calculator
Dimensions in — square yards with square feet alongside, the unit carpet and some flooring still quote.
Open →Square Feet to Cubic Feet Calculator
Area and depth in — cubic feet out: the step that turns a floor measurement into a material order.
Open →Square Feet to Cubic Yards Calculator
Area and depth in — cubic yards out, ready for the bulk order, with the tonnage comparison on the same line.
Open →Feet and Inches Calculator
Feet and inches in — total inches, formatted length and additions out, the tape-measure arithmetic done right.
Open →Inch Fraction Calculator
Decimal inches in — the nearest tape-measure fraction (down to 1/32) out, with the exact decimal alongside.
Open →Scale Conversion Calculator
Real dimension and scale ratio in — model size out, for 1:24 diecasts, 1:50 plans and 1:87 train layouts.
Open →Tank Volume Calculator
Tank dimensions in — gallons and liters out, for aquariums, rain barrels, stock tanks and cisterns.
Open →Plumbing & HVAC Calculators
BTUs, CFM, pipe volume, water velocity, refrigerant and AC sizing.
Furnace BTU Calculator
Heat load → input BTU → standard furnace size.
Open →CFM Calculator
Ventilation CFM from volume and air changes per hour.
Open →Window AC Size Calculator
BTU by room size, snapped to a real model size.
Open →Pipe Volume Calculator
Gallons and water weight for any pipe run.
Open →Water Velocity Calculator
Feet per second from GPM, with the design band.
Open →Flow Rate Calculator
GPM from the continuity equation, plus GPH.
Open →Refrigerant Line Charge
Additional charge by liquid line size and length.
Open →More calculators
Everything else on the site.
Stop guessing, stop overbuying
Every DIY project starts with the same question: how much do I need? Buy too little and you make a second trip to the yard. Buy too much and you are hauling bags back for a refund. BuildingsMath gives you the numbers in seconds — cubic yards, bags, tons, boards, gallons or tiles, depending on what your supplier actually sells.
Made for weekend builders
Each calculator shows the formula behind the answer, so you can sanity-check it with a tape measure and a pencil. Everything runs right here in your browser: no accounts, no uploads, no pop-ups covering the results.
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Missing a feature or found something off? Tell us — user suggestions decide what we build next.