Free construction calculators for homeowners, contractors, and engineers. Estimate concrete, gravel, drainage, septic, foundations, slabs, joists, pavers, and other building project quantities.
Use this paver base calculator to estimate how much gravel base and bedding sand you need for a patio, walkway, or driveway paver project. Enter the area, base depth, and sand depth to get material quantities in US-friendly units.
Quick Summary A septic drain field size depends on daily wastewater flow, soil absorption, trench layout, and local code. Bedrooms are often…
Quick Summary Septic tank installation cost usually ranges from $6,000 to $15,000 for a standard conventional system. Septic tank replacement cost is…
Use this concrete driveway cost calculator to estimate cost by size, thickness, finish, and region. Covers plain, stamped, and replacement driveways.
Estimate roof rafter count, rafter length, spacing layout, and basic lumber quantity with this rafter spacing calculator. Learn standard spacing, span limits, pitch effects, and when to check local code.
Use this deck joist spacing calculator to estimate joist count and layout for 12-inch, 16-inch, and 24-inch on-center deck framing. Learn how joist spacing differs from joist span, when to use tighter spacing, and what to check before building.
Quick Summary Multiply your area in square feet by the depth in feet. Divide by 27 for cubic yards. Multiply by 1.3…
Use this free concrete slab price calculator to estimate slab cost by size, thickness, concrete volume, labor, reinforcement, and finish type.
Use this free gutter installation cost calculator to estimate gutters, downspouts, guards, removal and material cost by linear foot.
Use this concrete cinder block calculator to estimate blocks, mortar, openings, waste, core fill and rough wall material cost.
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