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.
Painting & Finishing
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Paint Calculator
Enter wall sizes, subtract doors and windows, get gallons for the coats you plan.
Coming soon -
Deck Stain Calculator
Gallons of stain for the deck, the stairs, and both sides of the railing.
Coming soon
Landscaping
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Mulch Calculator
Bed area and depth, converted to cubic yards and bags.
Coming soon -
Gravel Calculator
How many tons cover your area at the depth you want.
Coming soon -
Grass Seed Calculator
Pounds of seed for a new lawn or an overseed.
Coming soon -
Fence Post Calculator
Posts for your run length, plus the concrete to set them.
Coming soon
Concrete & Masonry
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Concrete Calculator
Slab and footing sizes turned into 60 lb or 80 lb bag counts.
Coming soon
Interior
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Wallpaper Calculator
Rolls needed once the pattern repeat is counted.
Coming soon -
Tile Calculator
Tiles and boxes for your area, with a sane waste factor.
Coming soon -
Drywall Calculator
Sheets, mud, and tape for the room you're finishing.
Coming soon
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.