HomeBuildCalcs: The Plumb and Level Figures for the Hands-On Homeowner
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Know what to buy before the store run.

52 free calculators for paint, framing, decks, fences, aggregates, electrical, drywall, flooring, roofing, siding, insulation, concrete and masonry — gallons, sheets, bundles, bags, and what the job should cost.

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Overhead view of a carpenter's square, pine boards, screwdriver, pencil, calipers, screws, drill bits, protractor and tape measure on a white table

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Cans of paint and primer, a roller, a brush and a drywall knife on a plywood subfloor

4 calculators

Paint

Paint, coverage, interior & exterior cost

 Gloved hand setting large gray floor tile with leveling clips over notched thinset

5 calculators

Drywall & Flooring

Drywall, mud, flooring & tile

 Roofer nailing architectural shingles over synthetic underlayment

3 calculators

Roofing, Siding & Insulation

Shingles, siding & insulation

 Fresh concrete being floated inside wood forms over rebar

6 calculators

Concrete

Slabs, bags, driveways, steps & columns

 Concrete block wall with a block pilaster and cap

4 calculators

Masonry & Footings

Block, mortar, footings & rebar

 Sunlit wood stud framing inside a house under construction

3 calculators

Framing & Stairs

Stairs, roof pitch & board footage

 Pneumatic nail gun resting on deck boards mid-build

3 calculators

Decks & Fences

Deck boards, fencing & post depth

 Close-up of gray crushed gravel

4 calculators

Aggregates & Hardscape

Gravel, mulch, sand & pavers

 Color-coded wiring on a circuit breaker panel

5 calculators

Electrical

Voltage drop, wire gauge, load & generators

 Hand holding a magnifying glass

4 finders

Finders

Which flooring, sheen, siding & roof?

 Close-up of a vintage scale dial with weight and measurement markings

15 tools

Converters & Lookups

Volume, area, material weight & lumber sizing

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Paint Calculator

Enter room size, doors, windows and coats to get wall area, gallons and cans of paint to buy.

Drywall Calculator

Room size in, sheets of drywall out, plus screws, tape and mud for the job.

Concrete Calculator

Turn slab, wall, footing or post-hole dimensions into cubic yards and 40, 60 or 80 lb bag counts.

Flooring Calculator

Square footage, boxes to buy and material cost for tile, laminate, vinyl plank or hardwood.

Roofing Shingles Calculator

Footprint and roof pitch in; roof area, squares and shingle bundles out.

Drywall Installation Cost Calculator

Estimate the installed cost to hang and finish drywall, by square footage and finish level.

All HomeBuildCalcs tools

How HomeBuildCalcs works

Every home project starts with a quantity: how much concrete, how many sheets, how much paint, how many bundles. HomeBuildCalcs does the arithmetic and explains the method, so you can see how each answer was reached. Each tool says where a figure is an estimate, and your product's label, your local code and a licensed professional always have the last word.

Where to start

Read more about the site, how we calculate and our disclaimer and safety notes. Spotted a mistake? Tell us.