Home project estimating
Measure right. Buy the right amount.
Free calculators for paint, mulch, concrete, and the rest of your project list. Each one shows its formula, names the manufacturer spec behind every number, and rounds the answer up to whole gallons and bags.
- Formula Printed on the page, so you can check the math yourself.
- Source Manufacturer specs, named in the guide and dated.
- Rounding Whole gallons, bags, and rolls. Raw math shown too.
01 Painting & Finishing
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Paint Calculator
Enter wall sizes, subtract doors and windows, get gallons for the coats you plan.
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Deck Stain Calculator
Gallons of stain for the deck, the stairs, and both sides of the railing.
02 Landscaping
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Mulch Calculator
Bed area and depth, converted to cubic yards and bags.
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Gravel Calculator
How many tons cover your area at the depth you want.
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Grass Seed Calculator
Pounds of seed for a new lawn or an overseed.
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Fence Post Calculator
Posts for your run length, plus the concrete to set them.
03 Concrete & Masonry
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Concrete Calculator
Slab and footing sizes turned into 60 lb or 80 lb bag counts.
04 Interior
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Wallpaper Calculator
Rolls needed once the pattern repeat is counted.
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Tile Calculator
Tiles and boxes for your area, with a sane waste factor.
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Drywall Calculator
Sheets, mud, and tape for the room you're finishing.
Where the numbers come from
- Every calculator on this site prints its formula on the page, so you can check the math yourself.
- Coverage and yield numbers come from manufacturer specs, with the source named and the date it was checked. When two good sources disagree, we say so and explain which one the calculator uses.
- Results round up to what a store actually sells: whole gallons, whole bags, whole rolls. The raw math sits right next to the rounded number.