– PRACTICAL CONSTRUCTION TOOLS
Free, easy-to-use material calculators for the jobs around your home. Choose metric or imperial units and turn measurements into a clear shopping list.
Find your calculator ↓– ALL CALCULATORS
Each tool gives a practical starting estimate. Always confirm structural details, local rules and product specifications before building.
Foundations, surfaces and outdoor structure
Ready-mix volume and bag count for slabs, paths and pads.
Calculate concrete → 02Estimate aggregate volume, weight and bulk bags.
Calculate gravel → 03Plan pavers, bedding sand, jointing sand and edging.
Calculate paving → 04Estimate blocks, base gravel, drainage stone and caps.
Plan a wall → 05Work out bricks or blocks plus mortar for a wall.
Calculate masonry →Plan the main parts of your build
Find roof pitch, angle, rafter length and surface area.
Calculate roof pitch → 07Calculate common-rafter length, ridge allowance and cuts.
Calculate rafters → 08Plan step count, risers, treads and stringer length.
Calculate stairs → 09Estimate cladding coverage, panels and trim lengths.
Calculate siding → 10Plan boards, joists, screws and an allowance for waste.
Plan a deck → 11Estimate panels, posts, rails and post-mix concrete.
Plan a fence →Make rooms ready, warm and finished
– HOW TO USE BUILD CALCULATORS
Measure carefully, choose your materials, and use the output as a shopping and planning guide. For projects that affect structure, drainage, safety or property boundaries, use qualified professional advice.