BUILDREFS Free Tools

Construction Calculators

Free field-ready calculators for concrete, rebar, asphalt, earthwork, framing, roofing, and more. All results include standard waste factors and unit conversions.

🧱 Concrete Volume

ydΒ³

Calculate concrete for slabs, columns, and footings in cubic yards, cubic feet, and bag count.

concrete slab footing column

πŸ—οΈ Concrete Footing

ydΒ³

Estimate concrete for round, square, or continuous wall footings with depth and diameter inputs.

concrete footing foundation pier

πŸ”© Rebar Weight

lbs

Estimate the total weight of reinforcing steel bars by size, quantity, and length.

rebar steel reinforcement

πŸ›£οΈ Asphalt Tonnage

tons

Calculate asphalt mix required for a paving area by thickness and compacted density.

asphalt paving HMA

⛏️ Earthwork Cut/Fill

ydΒ³

Estimate cut and fill volumes for grading and earthwork using the average end area method.

earthwork grading excavation

πŸ“ Slope / Grade

%

Convert between percent grade, degree angle, and rise-over-run for any slope or drainage application.

slope grade drainage angle

πŸͺ¨ Gravel & Aggregate

tons

Calculate crushed stone, pea gravel, or aggregate in cubic yards, tons, and bags for driveways and base layers.

gravel aggregate crushed stone driveway

πŸ–οΈ Sand & Base Material

tons

Estimate sand, paver base, road base, or DGA in cubic yards, tons, and bag count with 10% waste factor.

sand base paver DGA road base

🚜 Trench & Backfill

CY

Calculate excavation volume, backfill needed, spoil haul-off, and truck loads for utility and drainage trenches.

trench backfill excavation spoil utility

🌍 Swell & Shrink

CY

Convert bank, loose, and compacted soil volumes using swell and shrink factors for earthwork calculations.

swell shrink soil earthwork compaction

🧲 Retaining Wall

blocks

Estimate block count, cap blocks, courses, and deadman anchors for standard, large, or natural stone retaining walls.

retaining wall block masonry landscape

🏠 Roofing Squares

squares

Calculate roofing squares, shingles, underlayment, and ridge cap for any roof pitch and area.

roofing shingles squares pitch

πŸͺœ Stair Rise & Run

steps

Calculate stair risers, treads, stringer length, and tread board count for code-compliant stairs.

stairs rise run stringer treads

πŸͺ΅ Deck Materials

boards

Estimate decking boards, joists, posts, and hardware for wood or composite deck construction.

deck lumber composite joists outdoor

πŸ”¨ Lumber & Studs

studs

Calculate stud count, top and bottom plates, headers, and sheathing sheets for framed walls.

lumber studs framing wall sheathing

🚧 Fence Material

posts

Estimate posts, rails, pickets, and concrete for wood privacy, picket, split rail, or chain link fences.

fence posts pickets rails chain link

πŸͺŸ Drywall Sheets

sheets

Calculate drywall sheet count, joint compound, tape, and screws for walls and ceilings by room dimensions.

drywall gypsum sheetrock interior walls

πŸ–ŒοΈ Paint Coverage

gal

Estimate gallons of paint needed for walls, ceilings, or exterior surfaces by area and number of coats.

paint coverage gallons interior exterior

πŸ”² Tile & Flooring

boxes

Calculate tile count, boxes, grout, and adhesive for ceramic tile, LVP, hardwood, laminate, or carpet.

tile flooring LVP hardwood laminate grout