Learn how construction estimates are calculated, including concrete volume, gravel quantity, slope, drainage fall, asphalt tonnage, excavation volume, waste factors, density, and compaction assumptions.
Construction Guides
Use these guides to understand the formulas, unit conversions, waste factors, and ordering checks behind the construction calculators.
How to Calculate Concrete Volume for Slabs, Columns, and Stairs
Learn slab, column, circular pier, and stair volume formulas with unit conversions, examples, waste factors, and common mistakes.
Aggregate GuideHow to Estimate Gravel, Crushed Stone, and Road Base Quantity
Learn how to estimate gravel, crushed stone, and road base using area, depth, cubic yards, tons, density, compaction, and waste factor.
Slope GuideHow to Calculate Slope, Grade, Rise, Run, and Angle
Learn how to calculate slope, percent grade, rise, run, slope ratio, and angle using construction layout formulas and unit conversions.
Drainage GuideHow to Calculate Drainage Fall and Pipe Slope
Learn how to calculate drainage fall, pipe slope, gradient, percentage slope, fall per foot, and fall per metre for drain, sewer, and stormwater pipes.
Asphalt GuideHow to Estimate Asphalt Tonnage for Driveways and Patches
Learn how to estimate asphalt tonnage using area, thickness, compacted depth, density, waste factor, and tons needed for driveways, patches, and small paving jobs.
Estimating GuideConstruction Material Estimate Limits: Waste, Density, and Compaction
Learn why construction material estimates can change because of waste factor, material density, compaction, moisture, loose volume, compacted volume, and site conditions.
Masonry GuideConcrete Block, CMU Grout, and Rebar Estimation Guide
Learn how to estimate concrete blocks, CMU grout, and rebar using wall area, block size, core fill, vertical bars, horizontal reinforcement, and waste factor.
Layout GuideHow to Use the 3-4-5 Rule for Construction Layout
Learn how to use the 3-4-5 rule to square corners, check right angles, scale layout triangles, and verify foundations, forms, decks, and batter boards.