Sitework calculators — sourced math, practical-order cushion, every calc.
Each calculator outputs a four-line Material Order Cushion: the exact math, the practical-order amount, the cushion reasoning, and the “when not to over-order” ceiling. Sources cite the standards bodies + manufacturer data sheets the math actually comes from — not competitor calculators or content sites.
- No. 01
Concrete yardage calculator →
Slab, footing, post hole, and stair concrete math with the Material Order Cushion built in. Outputs cubic yards, 60 lb / 80 lb bag count, and the residential ready-mix minimum-order warning.
- Output ·
- Exact yd³ + practical-order yd³ + 60lb/80lb bag count + below-ready-mix-minimum flag
- Sources ·
- ACI 332-20 (residential code), ASTM C94 (ready-mix), NRMCA CIP 31 (short-load fees), Quikrete + Sakrete data sheets (bag yields). All five concrete cluster guides cite by reference; engine logic in lib/sitework/concrete.ts.
- No. 02
Topsoil calculator →
New lawn / overseeding / garden / flower bed presets with the practical-order cushion + 40 lb bag counts at both loose and compressed yields. Surfaces the supplier-minimum trap on small orders.
- Output ·
- Exact yd³ + practical-order yd³ + 40 lb bag count (1 cu ft loose / 0.75 cu ft compressed) + below-supplier-minimum flag
- Sources ·
- Industry-consensus depth recommendations (4-6″ new lawn, ¼-½″ overseeding, 8-12″ garden) framed as such — cooperative-extension publications cover seedbed prep + watering depth, not topsoil-spread depth values. UC Agriculture & Natural Resources Healthy Lawns + UMN Extension cited for what they DO cover.
- No. 03
Mulch calculator →
Ornamental / vegetable / tree-ring presets with the 25% first-year settling cushion sourced to Penn State Extension. Tree-ring mode renders a sourced volcano-mulching warning per ANSI A300.
- Output ·
- Exact yd³ + practical-order yd³ (with settling) + 2 cu ft / 3 cu ft bag count + tree-mode safety callout
- Sources ·
- Penn State Extension on Mulching Landscape Trees (2-4″ depth, 3-3-3 rule, 25% first-year settling, trunk-distance guidance), TCIA/ANSI A300 (formal arboriculture standard), Iowa State Extension (cross-check).
- No. 04
Tile calculator →
Sq ft to box count with operator-default waste cushions built in (10% straight / 12% subway-1/3 / 15% diagonal-or-herringbone / 20% bullnose-trim). Lot-number color-drift caveat on every result.
- Output ·
- Exact tile count + practical (with waste) + boxes needed + total coverage at boxes ordered
- Sources ·
- TCNA Handbook waste-factor norms cited by reference (paywalled — no fabricated URL fetch). Daltile installation guidance + ANSI A108/A118/A136.1:2024 cited by name when guides touch installation method. Tiles-per-box from manufacturer data sheets.
- No. 05
Deck cost calculator (surface materials) →
Surface-material-only deck calc — boards, fasteners, optional rough cost. Material preset (cedar / PT / composite) auto-fills fastener type per warranty. Explicit non-scope: does NOT estimate joists / beams / posts / footings / railings / stairs.
- Output ·
- Linear feet + board count + fastener count + (optional) material cost + 16 ft practical-max warning
- Sources ·
- AWC DCA-6 cited for joist-spacing default (16″ oc) + structural-frame opt-out only (16 ft board-length cap is SiteworkMath field preference), IRC 2021 R5 cited by name (paywalled), Trex + TimberTech installation guidance (composite warranty + clip systems). Surface-material only; structural-frame design is out of scope.