Updated Aug 17, 2026 · Formulas, examples, and source scope reviewed
Open the education center →Free tools · US customary units
Measure the job.
Buy the right amount.
Fast material estimates for weekend projects, store runs, and first-pass budgets—with the math shown and the assumptions left in your control.
Planning estimate only. Verify dimensions, product yield, coverage, and code requirements before ordering.
9material calculators
USfeet, inches, yards
0accounts required
Inputs stay in your browser. Results are planning estimates.
Three ways to start
Volume, weight,
or surface coverage.
Concrete and gravel begin with geometry, but only gravel converts that volume to an estimated weight. Paint starts with surface area and product coverage. Choose the question before choosing the calculator.
Cubic yards and bags
Estimate ready-mix yards and 40, 60, or 80 lb bags for a rectangular slab.
Open calculator ↗Yards and tons
Turn a driveway or base-course area into cubic yards and estimated tons.
Open calculator ↗Gallons by room
Estimate gallons from room dimensions, coats, coverage, doors, and windows.
Open calculator ↗The material rule
Net quantity first.
Allowance second.
Packages last.
That order keeps cuts, compaction, coverage, and full-package rounding visible instead of hiding them inside a single mystery number.
Read our methodology →Add the selected allowance before placing the order.
Field notes
Know what the
number means.
Short guides for the decisions that a result box cannot make for you.
How to calculate concrete yards and bags
Measure slab volume, convert cubic feet to cubic yards, and choose between bags and ready-mix.
Read field guide →Field Guide 02 · 6 minCubic yards explained for gravel, mulch, and soil
A visual way to understand depth, volume, coverage, and bulk delivery quantities.
Read field guide →Field Guide 03 · 6 minHow much paint do you need for a room?
Account for perimeter, height, openings, coats, primer, and the coverage on the label.
Read field guide →Field Guide 04 · 8 minDrywall sheet sizes and room estimating
Compare common panel sizes, estimate walls and ceilings, and plan for joints and waste.
Read field guide →Evidence, not false precision
Official context.
Product evidence.
Local verification.
Government sources can explain units, safety context, and national material supply. They cannot provide your supplier's density, bag yield, coverage, quote, or local code decision.
See the evidence framework →Review dates and corrections are documented on the About and Methodology pages.