Free garden tools, built on real data
Plan planting, order the right amount of material and skip the guesswork. Every tool here is free, works on your phone and uses public data from NOAA, the USDA and university extension services.
Data tools
Frost Dates by ZIP CodeNew
Median and safer 10%-risk frost dates and frost-free days from the nearest of 7,247 NOAA stations.
Open tool →Hardiness Zone by ZIP CodeNew
Your USDA 2023 plant hardiness zone, its coldest-night temperature and your frost dates in one lookup.
Open tool →Frost Dates by State
Town-by-town last and first frost tables for every state, with how elevation shifts the dates.
Open tool →Free Frost Date Dataset
Download every station's frost dates as CSV for your blog, class or research. Free with attribution.
Open tool →Embed Our Tools
Add the frost lookup or any calculator to your garden club, nursery or landscaping site in one line.
Open tool →Most-used calculators
Stair CalculatorNew
Risers, treads, stringer length and code checks for any total rise.
Open tool →Gravel CalculatorNew
Cubic yards, tons and bags of gravel by stone type and depth.
Open tool →Pool Volume CalculatorNew
Gallons for rectangle, round, oval and kidney pools, plus fill time.
Open tool →Paver CalculatorNew
Pavers, base gravel, bedding sand, polymeric sand and edging.
Open tool →Roofing, framing, soil and lawn care
Roof Pitch CalculatorNew
Pitch, angle, slope factor, rafter length and ridge height from rise and run, width or degrees.
Open tool →Roofing CalculatorNew
Squares, shingle bundles, underlayment, starter, ridge cap and drip edge from the house size and pitch.
Open tool →Topsoil CalculatorNew
Cubic yards, tons, bags and truckloads of topsoil for lawns, beds and gardens.
Open tool →Deck Joist Span CalculatorNew
Maximum joist span by species, size and spacing (DCA 6 method), with a span check.
Open tool →Fertilizer CalculatorNew
Pounds or ounces of any N-P-K fertilizer per 1,000 sq ft and for your whole lawn.
Open tool →Shingle CalculatorNew
Bundles of shingles from measured roof planes, plus starter and ridge cap.
Open tool →Sand CalculatorNew
Cubic yards, tons and 50 lb bags of play, mason, concrete or fill sand.
Open tool →Polymeric Sand CalculatorNew
Bags of polymeric sand from paver size, joint width and depth.
Open tool →Floor Joist Span CalculatorNew
Floor joist span chart and checker for 30 and 40 psf floors.
Open tool →Rafter Span CalculatorNew
Maximum rafter span for roof live load or snow, with or without a ceiling.
Open tool →Advanced planning tools
Acreage CalculatorNew
Draw your lot on a satellite map, or enter sides, for acres and square feet.
Open tool →BTU CalculatorNew
AC and heating BTU for each room with ENERGY STAR adjustments.
Open tool →Concrete CalculatorNew
Slabs, footings, columns and steps: yards, bags, trucks, rebar and base.
Open tool →Deck Stain CalculatorNew
Gallons of stain or sealer for deck floor, railings and stairs.
Open tool →Square Feet to Acres CalculatorNew
Convert sq ft, acres, hectares, m², sq yd and sq mi.
Open tool →Mini Split Size CalculatorNew
Indoor head sizes per room and the outdoor unit for a multi-zone system.
Open tool →Concrete Slab CalculatorNew
Yards, bags, rebar or mesh and gravel base for a slab.
Open tool →Concrete Bag CalculatorNew
How many 40, 60 or 80 lb bags of concrete for a small pour.
Open tool →Fence Stain CalculatorNew
Gallons of stain for one or both sides of any fence style.
Open tool →Exterior Paint CalculatorNew
Gallons of siding and trim paint for a house, minus doors and windows.
Open tool →Measuring and soil calculators
Square Footage CalculatorNew
Square feet for any shape in feet and inches, plus sq yd, m², acres and cost.
Open tool →Cubic Yard CalculatorNew
Cubic yards, tons and bags for soil, gravel, mulch, sand or concrete.
Open tool →Board Foot CalculatorNew
Board feet, linear feet and cost for a lumber list.
Open tool →Raised Bed Soil CalculatorNew
Soil and mix ingredients for raised beds, in cu ft, yards and bags.
Open tool →Countertop Square Footage CalculatorNew
Countertop and backsplash square feet and cost from inches.
Open tool →Cubic Yards to Tons CalculatorNew
Convert yards and tons for gravel, soil, sand, mulch and concrete.
Open tool →Log Board Foot CalculatorNew
Board feet in logs by Doyle, Scribner and International ¼ in.
Open tool →Potting Soil CalculatorNew
Quarts and bags of potting mix for pots, planters and grow bags.
Open tool →Deck, fence, tile and drywall calculators
Deck CalculatorNew
Deck boards, joists, hangers, screws or clips and footing concrete.
Open tool →Fence CalculatorNew
Posts, rails, pickets or panels and post concrete for any fence.
Open tool →Tile CalculatorNew
Tiles, boxes, grout and thinset for floors and walls.
Open tool →Drywall CalculatorNew
Sheets, screws, joint compound and tape for any room.
Open tool →Fence Post Concrete CalculatorNew
Bags of concrete per post hole or Sonotube footing.
Open tool →Shower Tile CalculatorNew
Wall and floor tile, grout, thinset and waterproofing for a shower.
Open tool →More hardscape and pool calculators
Stair Stringer Calculator
Cut layout, stringer length, throat depth and how many stringers.
Open tool →Pea Gravel Calculator
Pea gravel for paths, patios and play areas in yards, tons and bags.
Open tool →Driveway Gravel Calculator
Tons of stone for each driveway layer: base, middle and top.
Open tool →Pool Salt Calculator
Pounds and bags of salt for a saltwater pool, or how much to drain.
Open tool →Pool Shock Calculator
Shock dose for cal-hypo, dichlor or liquid chlorine, including SLAM.
Open tool →Paver Base Calculator
Tons of base gravel and bedding sand under a patio or driveway.
Open tool →Lawn calculators
Sod CalculatorNew
Square feet, pallets, slabs or rolls, topsoil and cost for any lawn shape.
Open tool →Grass Seed CalculatorNew
Pounds of seed and the bags to buy by grass type, for a new lawn or overseeding.
Open tool →Home and hardscape calculators
Concrete Block CalculatorNew
CMU blocks, mortar bags, core grout, rebar and footing concrete for one wall or several, with cost.
Open tool →Retaining Wall CalculatorNew
Wall and cap blocks, base gravel, drainage stone, drain pipe and fabric for a segmental block wall.
Open tool →Garden calculators
Planting Calendar by ZIP
Start-indoors, transplant and sowing dates for 30 vegetables and herbs, built from your frost dates.
Open tool →Mulch Calculator
Cubic yards, bags and cost for any bed shape, with depth guidance by mulch type.
Open tool →Soil Calculator
Soil for raised beds and borders in cubic feet, yards and bags.
Open tool →Topsoil & Gravel Calculator
Tons and yards of topsoil, gravel and sand for paths, bases and fills.
Open tool →Lawn Fertilizer Calculator
Pounds of product per 1,000 sq ft from the NPK numbers on the bag.
Open tool →Paver & Patio Calculator
Pavers, base gravel and sand for a patio or walkway.
Open tool →Why trust these tools?
Each tool shows its source and method. Frost dates come straight from NOAA's 1991–2020 climate normals; calculators use standard volume formulas and coverage rates checked against university extension publications. Nothing here needs an account, and the tools don't track what you type. Read the methodology.