How much do you actually need?
Enter your dimensions, get the quantity — in the units the supplier sells it in, with waste accounted for and bag counts rounded up. 35 calculators so far, each one checked against the published yield figures rather than a rule of thumb.
Straight to an answer
- How much carpet for a 12x12 room?
- How many bags of fast-setting concrete per post?
- How much concrete for a mailbox post?
- How many deck screws for a 12x16 deck?
- How many tons of gravel in a cubic yard?
- How much grout for 100 square feet of 12x24 tile?
- How much grout for a mosaic tile backsplash?
- How much grout for a subway tile shower?
Concrete & Masonry
Slabs, footings, blocks, mortar and grout.
Landscaping
Mulch, soil, gravel, sand, sod and edging.
Interior
Paint, drywall, flooring, tile and trim.
Exterior
Roofing, siding, decking, fencing and insulation.
Why the numbers here are different
Most material calculators quietly skip the parts that cost you money. They leave out the waste allowance, or they round bag counts down, or they use a coverage figure that no manufacturer actually prints. Each calculator here names the yield figure it uses and where it comes from, so you can check it against the bag in your hand.