The math behind the calculators: bag counts, bulk-vs-bags math, and the density tables suppliers use. Short, practical, no fluff.
Bag counts for every common bag size, when to use bags vs ready-mix, and the real cost math.
The mulch formula, coverage tables by depth, and the bag-vs-bulk breakpoint.
Density tables, both formulas, and how suppliers actually bill bulk materials.
Composition, best uses, the two-layer technique, and the #1 DIY mistake to avoid.
Pound-per-yard chart for every material, dry vs wet, and can-your-truck-haul-it math.
Tons by driveway size, the 3-layer build-up, and which stone goes where.
Cost-per-yard comparison, the break-even chart, short-load fees, and a decision checklist.
The 4-6-1 layer build-up, materials by patio size, bedding vs joint sand.
Neutral comparison for driveways, walkways, and drainage — with quantity tables.
Loads by wheelbarrow size, struck vs heaped capacity, and weight-per-load safety.
Bed, trailer & dump-truck capacity charts, plus the weight-vs-volume rule that decides what you can actually haul.
Yards, tons and bag counts by pool size, the 2-inch rule, and mason sand vs play sand.
Per-foot volume chart, #57 stone guidance, and why pea gravel is the wrong pick.
CPSC/ASTM F1292 fall-height depth table, wood vs rubber mulch, and quantity examples.
Shed-size to pad-size chart in yards and tons, depth rules, and the compaction steps.
Worked examples, the 10–20% compaction rule, and pool-fill truckload math.
Decision framework, weed myth-busting, woven vs non-woven, and install steps.
Circle-size chart in yards and tons, the layer stack, and the burn-area safety rule.
Side-by-side comparison, the DG naming confusion cleared up, and depth guidance.
Installed rates per yard, DIY-vs-pro tables by project size, and add-on pricing.
Base and backfill quantity guide with worked charts, yards-to-tons math, and which stone to order.
Grain-size comparison, use-this-not-this per project, and bag-vs-bulk buying notes.
Project-size tables in yards, tons and bags for paths at 2 and 4 inch depths.
#57, #21A, crusher run, pea gravel and more — what each size is and which project it fits.
Bag-count tables by sandbox size, cubic-yard math, and the bulk-vs-bags breakpoint.
Pad-size tables by rig class in cubic yards and tons, base-layer build, and drainage tips.
Shape-by-shape measuring playbook with worked examples — rectangles, L-shapes, circles, curves, slopes.
Wedge-volume slope math, lawn-leveling thin-layer math, and fill-vs-topsoil layering.
Channel cross-section method to tons, rock-size layering, and ordering tips.
Project-first buying decision, quantity tables, cost-per-yard comparison, and bagged label math.
Bag-count tables by brick type, joint-thickness multipliers, Type N/S/M selection, and bagged vs site-mix cost.
Settlement percentages by material, the fluff factor explained, and order-buffer tables by project.
Head-to-head comparison, dual-material yard/ton tables, and the long-term maintenance math.
Wall-height bag tables, sand-to-order math, and the bagged-vs-bulk crossover.
Run-size tables in yards, tons, and bags, plus the best materials for paws and drainage.
Depth tables by slab use, yardage and tonnage charts, and the right stone to order.
Top-layer and base-layer volumes for loose gravel patios, with settlement overage.
Tons-per-linear-foot tables for homeowner projects, stone size classes, and permits.
Block counts by retail block face size, cap math, and the buried-course rule.
One-page ordering sheet: sod pallets, topsoil yards, and truckloads for new lawns.
Installed and DIY cost ranges for both materials, a worked 20×40 ft example, lifespan and maintenance math, climate guidance, and a decision flowchart.
Depth tables for driveways, patios & shed bases, the cubic-yard formula, tons conversions by stone type, and the compaction adjustment.
Bulk gravel at $40–$70/yd by type, the 54-bag $243 math, per-ton equivalents, and delivery fees.
Screened $25–$60/yd vs unscreened $15–$30, bag-count math, per-ton conversions, and project costs.
Mason/concrete sand $25–$45/yd, play-sand bag math, polymeric paver-sand premiums, per-ton math.
Fill dirt at $10–$25/yd (often free locally), screened vs unscreened, delivery minimums, settlement buffer.
The 324 ÷ depth rule, master coverage table by depth, and per-material project tables for mulch, gravel, topsoil, and concrete.
Typical rebar spacing by application, worked bar-count tables for 10×10 and 20×20 slabs, lap-splice rules, and a weight table by bar size.
Bed-size tables in cubic feet, cubic yards, and bag counts; soil-mix ratios; Hügelkultur deep-bed fill; and the bulk-vs-bag breakpoint.
Coverage by rock size, 1.45 vs 2.35 t/yd³ density-line distinction, worked project table, fabric + edging.
Truck class chart, payload-weight math (14 yd³ gravel = 19.6 t → ~11 yd³ effective), delivery costs.
Pro $0.15–$0.35 / DIY $0.08–$0.15 per sq ft (verified), 800 sq ft worked example, 6–12 mo first-seal wait + 3–5 yr interval.
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