Home and garden calculators that show their math
Work out how much paint, flooring, concrete, mulch, or soil to buy before you head to the store. Results round up to real can, box, and bag sizes, add a little extra for waste, and estimate the cost.
Walls
- Paint Calculator Gallons of wall, ceiling, and trim paint for one room or a whole house, with primer and cost.
- Drywall Calculator Sheets of drywall for walls and ceilings in 4 × 8, 4 × 10, or 4 × 12, with joint compound, tape, screws, and cost.
- Wallpaper Calculator Rolls of wallpaper for a room or an accent wall, counted by strips with pattern repeat and half-drop match.
Floors
Outdoor
- Concrete Calculator Bags of concrete for slabs, footings, and post holes in every bag size, with cost and cubic yards for ready-mix.
- Fence Calculator Posts, rails, pickets, and post concrete for a wood fence, with gates, corners, and even picket spacing.
- Deck Board Calculator Deck boards by length with the fewest joints and least waste, plus hidden clips or screws, for straight or diagonal decks.
Landscape
- Mulch Calculator Bags or cubic yards of mulch for beds and tree rings, with a top-up mode and bags vs bulk delivery.
- Gravel Calculator Cubic yards and tons of gravel for paths, patios, and driveways, with stone weights, compaction, and two-layer driveways.
- Topsoil Calculator Bags or cubic yards of topsoil for sod, new lawns, topdressing, and low spots, with settling and bulk vs bags.
Garden
- Planting Zone Your USDA hardiness zone and half zone by ZIP code, with the winter low behind it and the change since 2012.
- Frost Dates Last spring and first fall frost for your ZIP code from NOAA station records, at three risk levels and three temperatures.
- Planting Calendar When to start seeds, plant out, and sow fall crops for 30 vegetables, counted from your ZIP code frost dates.
- Raised Bed Soil Calculator Soil for one or more raised beds, as bags of each ingredient in a compost and topsoil mix, with filler and settling.
Every calculator lists its sources and the formula it uses. Read how we calculate or who makes Plank & Plot.