The Formula Shed
Free calculators for home improvement and yard projects. Clear formulas, no signup, works offline.
Materials
How much stuff to order — concrete, gravel, mulch, and soil.
Concrete Calculator
How many yards or bags of concrete does your slab, footing, or post hole need?
Gravel Calculator
How many cubic yards or tons of gravel does your driveway, path, or French drain need?
Mulch Calculator
How many cubic yards or bags of mulch does your garden bed need?
Topsoil Calculator
How much topsoil does your lawn, garden bed, or raised bed need?
Board Feet Calculator
How many board feet is that lumber — and what does it cost?
Pea Gravel Calculator
How much pea gravel for paths, play areas, and dog runs?
Crushed Stone Calculator
How much #57 crushed stone for the driveway base or patio subbase?
Concrete Bag Calculator
Counting bags for a small pour — not paying a truck minimum?
Post Hole Concrete Calculator
How many bags to set that fence or deck post?
River Rock Calculator
How much river rock for the dry creek bed or flower bed border?
Crusher Run Calculator
How much crusher run (#411) to build that hard-packed base?
Sand Calculator
How much sand for the paver base, sandbox, or volleyball court?
Concrete Slab Calculator
Yards and bags for a patio, shed base, or driveway slab?
Yard & Garden
Lawns, beds, and everything green.
Sod Calculator
How many pallets or rolls of sod does your lawn need?
Grass Seed Calculator
How many pounds of grass seed does your lawn need?
Raised Bed Soil Calculator
How much soil do you need to fill those raised beds?
Lawn Fertilizer Calculator
How much fertilizer does your lawn actually need?
Compost Calculator
How much compost to work into that garden bed?
Playground Mulch Calculator
Engineered wood fiber for under the playset — at CPSC depth?
Lawn Topdressing Calculator
How much soil to level and feed that lawn?
Interior
Paint, drywall, tile, and floors.
Paint Calculator
How much paint do you need for that room?
Drywall Calculator
How many sheets of drywall do you need for that room?
Tile Calculator
How many tiles and boxes do you need for that floor or wall?
Flooring Calculator
How many boxes of laminate, vinyl, or hardwood do you need?
LVP Flooring Calculator
Boxes of luxury vinyl plank for that room?
Exterior
Roofs, fences, and the outside of the house.
Roofing Calculator
How many bundles of shingles for that roof?
Fence Calculator
Posts, rails, and pickets for that fence line?
Deck Calculator
Deck boards, joists, and screws for that new deck?
Insulation Calculator
How deep and how many bags to hit that R-value?
Paver Calculator
How many pavers for that patio, walkway, or driveway?
Retaining Wall Calculator
How many blocks for that retaining wall — plus caps and backfill?
Exterior Paint Calculator
How much paint for the outside of the house?
Electrical
Plan the amps before you run the wire.
Seasonal
Timed to the season at hand.
Nothing matches that — try “gravel”, “paint”, or “soil”.