Construction Calculators
Free building and material estimation tools
Plan your construction and home improvement projects with confidence. Our free calculators help you estimate materials for concrete work, landscaping, painting, and more — so you order the right amount and avoid costly waste or shortages.
Concrete Calculator
Calculate cubic yards and bags of concrete needed.
Drywall Calculator
Estimate the number of drywall sheets for your project.
Paint Calculator
Calculate how many gallons of paint you need.
Flooring Calculator
Estimate flooring material including waste allowance.
Mulch & Soil Calculator
Calculate cubic yards of mulch or soil needed.
Gravel Calculator
Calculate cubic yards and tons of gravel for driveways and paths.
Square Footage Calculator
Calculate area in square feet for rectangles, circles, and more.
Stair Calculator
Calculate risers, treads, and total run for building stairs.
Deck Calculator
Estimate decking boards, screws, and materials for your deck.
Fence Calculator
Calculate posts, rails, and pickets for your fence project.
Roofing Calculator
Estimate roofing squares, shingle bundles, and costs.
Snow Load Calculator
Calculate snow weight on your roof based on depth and type.
Concrete Block Calculator
Calculate concrete blocks and mortar bags for walls.
Retaining Wall Calculator
Estimate blocks, cap blocks, and gravel for retaining walls.
Insulation Calculator
Calculate insulation thickness, materials, and R-value needs.
Lumber Calculator
Calculate board feet and lumber needed for your project.
Rebar Calculator
Calculate rebar quantity and spacing for concrete slabs.
Construction Guides & Articles
How to Calculate Concrete for Any Project
Learn to calculate the exact amount of concrete needed for slabs, footings, columns, and other common projects.
Gravel vs Crushed Stone: Which Do You Need?
Understand the differences between gravel and crushed stone, and which is best for your specific project.
How to Measure Square Footage of Irregular Rooms
Simple methods for calculating the square footage of L-shaped rooms, rooms with alcoves, and other irregular spaces.
DIY Deck Building: Materials Calculator Guide
Everything you need to know about estimating materials for a DIY deck project, from lumber to fasteners.
Related Categories
Frequently Asked Questions
How do I calculate how much concrete I need?
Multiply length × width × depth (all in feet), then divide by 27 to get cubic yards. Our Concrete Calculator handles slabs, footings, and columns.
How many cubic yards of gravel do I need?
Calculate your area in square feet, multiply by the depth in feet, then divide by 27. Our Gravel Calculator also converts to tons.
How do I calculate square footage of irregular shapes?
Divide the space into rectangles, calculate each area separately, then add them together. Our Square Footage Calculator handles multiple sections.
How many bags of mulch do I need?
Calculate cubic yards needed (area × depth ÷ 27), then divide by the bag size. A 2 cubic foot bag covers about 12 sq ft at 2 inches deep.
Are construction calculators accurate enough for ordering?
Our calculators provide reliable estimates. We recommend adding 10% extra for waste and variations. Always round up when ordering materials.