Free Quantity Calculators for Home Projects
Figure out how much concrete, gravel, mulch, sod, fertilizer, paint, drywall, tile, fencing, pavers, or roofing you need — in yards, bags, gallons, sheets, tiles, posts, pallets, or bundles. Built for DIYers and contractors who want a straight answer.
- Free forever
- No signup
- Works on your phone
- Shareable result links
How QtyLab works
Enter length, width, and depth — or area, coats, sheet size, tile size, sod coverage, or fertilizer rate. Results update as you type. Add a waste factor if you want a buffer for cuts and spills. Copy the page URL to bookmark or send your numbers to a supplier.
All math runs in your browser — nothing is uploaded. Estimates are for planning; always confirm with your ready-mix plant, bag specs, paint label, or tile carton before ordering.
Guides
Step-by-step answers for common “how much do I need?” questions — pair with the calculators below (including the free tile calculator).
How Much Mulch Do I Need?
Depth, coverage, and bag counts for garden beds and borders.
How Many Bags of Concrete Do I Need?
Slabs and footings → 60 lb / 80 lb bag estimates from volume.
How Many Gallons of Paint Do I Need?
Walls and rooms → gallons with coats, coverage, and waste.
How Many Drywall Sheets Do I Need?
Walls and ceilings → sheet counts, waste, and rough mud estimates.
How Many Tiles Do I Need?
Floors and walls → tile counts, waste, and optional box totals.
View all guides → · Need numbers fast? Open the tile calculator →
Calculators
Concrete Calculator
Slabs and round columns → cubic yards, cubic feet, and 60 lb / 80 lb bag counts.
Gravel Calculator
Driveways and paths → volume plus tons using an editable density.
Mulch Calculator
Beds and borders → cubic yards and 2 cu ft bag estimates.
Sod Calculator
New lawns → square feet with waste, square yards, and rough pallet counts.
Lawn Fertilizer Calculator
Turf feeding → pounds needed and bag counts from label rate.
Paint Calculator
Walls and rooms → gallons and quarts with coats, coverage, and waste.
Drywall Calculator
Walls and ceilings → sheet counts (4×8 / 4×10 / 4×12) plus rough mud estimate.
Tile Calculator
Floors and walls → tiles needed, optional box counts, and coverage with waste.
Fence Calculator
Privacy and wood fence → posts, panels, spacing, and optional pickets.
Paver Calculator
Patios and walkways → pavers, base gravel, bedding sand, polymeric sand, and edging.
Roofing Calculator
House size and pitch → squares, bundles of shingles, underlayment, drip edge, ridge cap, and nails.