About Yard & Bag
Yard & Bag is an independent reference site for people planning concrete, gravel, soil, and asphalt projects. We build calculators and guides that answer one question well: how much material do you actually need, and what will it roughly cost?
How our numbers work
Every calculator runs on standard material yields and densities, the same figures printed on bags and quoted by suppliers. Each formula is checked by hand against worked examples before it ships. Prices on this site are always shown as ranges with an "as of" date, because material prices move with your region and season. We never publish a made-up statistic.
What we are not
We are not a supplier, a contractor, or an engineering service. Our numbers are planning estimates, not construction documents. For anything structural, load-bearing, or code-related, confirm with a local contractor or your building department before you pour, dig, or build.
Corrections
If a number on this site looks wrong, we want to know. Email [email protected] and we will check it against our sources and fix it quickly. Getting the math right is the whole point of this site.