About DirtMath

DirtMath is a free, independent collection of landscape calculators built for homeowners, contractors, and weekend gardeners. We turn a project area and a desired depth into cubic yards, tons, bag counts, and rough cost estimates — in seconds, with no account required.

Why we exist

Ordering landscaping material is one of the easiest places to waste money. Order too much and you overpay for extra delivery; order too little and you pay twice for shipping. We built DirtMath so anyone can answer the question “how much do I need?” before they call a supplier or click “buy” online.

How we work

• Open math. Every formula and density is published on our methodology page, so you can check the numbers or adjust them to your local material.
• No account needed. Calculations run in your browser. We do not collect project dimensions, addresses, or personal information.
• Ad-supported. DirtMath is free because it is supported by ads and affiliate links. Product recommendations do not affect calculated results.

Affiliate disclosure

DirtMath is a participant in the Amazon Services LLC Associates Program. Some product links are affiliate links, which means we may earn a small commission on qualifying purchases at no extra cost to you. This helps keep the site free and does not influence our math or recommendations.

Get in touch

Questions, corrections, or feature ideas? Visit our contact page.