Construction Calculators – Concrete, Flooring and Roofing

Estimate materials for building and renovation projects. Our construction calculators cover concrete volume, flooring area, roof pitch, drywall and lumber quantities. Check dimensions, units and waste assumptions before ordering materials.

✓ 20 All Online Calculators✓ No login required✓ Mobile Ready

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Concrete Calculator Roofing Calculator

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Flooring

Calculate how much flooring material you need for any room with waste factor.

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Drywall

Calculate how many drywall sheets you need for walls and ceiling.

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Lumber

Calculate board feet of lumber needed and estimate material cost.

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Fence

Calculate posts, rails and pickets needed for any fence project.

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Carpet

Calculate how much carpet you need in square yards with waste allowance.

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Asphalt

Calculate how many tons of asphalt you need for a driveway or road project.

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Insulation

Calculate how many insulation bags or rolls you need by R-value.

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Deck

Calculate lumber boards needed for building a deck.

Concrete & Masonry

Calculate cubic yards of concrete for slabs, footings, columns, and driveways. Our concrete calculator eliminates guesswork and helps you order the exact amount needed — avoiding costly over-ordering or under-ordering.

Flooring Estimates

Use the flooring calculator to estimate area and material requirements from your room dimensions. Review the waste allowance and product coverage before ordering.

Roofing & Exterior

Calculate roofing squares, shingles, ridge length, and gutter requirements. Our roof pitch calculator helps you determine the correct rafter length and angle for any roof design.

Drywall and Lumber

Estimate drywall sheets and lumber quantities using the available calculators. Check sheet dimensions, board sizes and project-specific requirements with your supplier.

Construction Calculators Guides

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How to Calculate Concrete – Cubic Yards, Bags & Costs

Learn how to calculate concrete for slabs, footings, and columns. Convert cubic feet to cubic yards and estimate bags needed. Free calculator.

How to Calculate Flooring – Square Footage & Material Guide

Learn how to measure and calculate flooring for any room. Covers tile, hardwood, laminate, and carpet with waste factor recommendations.

How to Calculate Paint – Gallons Needed for Any Room

Learn how to calculate paint for walls and ceilings. Estimate gallons needed, coverage per coat, and cost for any room size.

How to Calculate Square Footage of a Room or House

Measure square footage for flooring, paint, or rent. Includes L-shapes, irregular rooms, and unit conversions.

Popular Construction Calculators Calculations

Frequently searched calculations — answered instantly with formulas and step-by-step explanations.

Concrete for a 10×10 slab Gravel for a driveway Roofing squares calculator Brick calculator for a wall

Construction Calculators Formula Reference

All Formulas →

Concrete Volume Formula – Cubic Yards and Meters Square Footage Formula – Length × Width

Frequently Asked Questions

How do I calculate how much concrete I need?▼

Volume (cubic yards) = Length (ft) × Width (ft) × Depth (ft) ÷ 27. For a 10×10 ft slab at 4 inches (0.33 ft) deep: 10 × 10 × 0.33 ÷ 27 = 1.22 cubic yards. Always add 10% for waste.

How many tiles do I need for a room?▼

Tile Quantity = Room Area ÷ Tile Area × 1.10 (for 10% waste). For a 100 sq ft room with 1 sq ft tiles: 100 × 1.10 = 110 tiles. Our tile calculator handles any tile size automatically.

How many gallons of paint do I need?▼

One gallon covers approximately 350–400 sq ft. Total area = (Perimeter × Height) − Door/Window area. Multiply by number of coats. Our paint calculator estimates this from room dimensions.

How do I calculate roofing squares?▼

1 roofing square = 100 sq ft. First measure the roof footprint, then multiply by the pitch factor (e.g., 1.118 for a 6/12 pitch) to get actual roof area, then divide by 100 for squares. Add 10–15% for waste.

How much lumber do I need for a project?▼

Lumber is measured in board feet: Board Feet = (Thickness × Width × Length) ÷ 144 (all in inches). Our lumber calculator converts linear feet to board feet and estimates the total quantity and cost for any project.

✓ Documented formulas — all tools use standard industry formulas✓ Updated regularly — content reviewed 2026✓ Used by thousands daily✓ Free — no sign-up required