Disclaimer

Last updated: September 2026. Please read this page carefully before using our calculators.

Educational information only

All content on YardMath — calculators, articles, tables, and examples — is published for general educational purposes. It is not landscaping or construction advice and is not a substitute for a qualified professional. We are not licensed contractor or your local cooperative extension offices, and no client or advisory relationship is created by your use of this Site.

Our calculators use industry-standard coverage figures (paint square-footage per gallon, seed rates per 1,000 sq ft, gravel and sand densities). Real projects vary with surface texture, product brand, slope, and technique — most pros add a waste allowance, and so should you.

For structural, drainage, or load-bearing decisions — retaining walls, decks, driveways — consult a qualified professional. Product coverage printed on the bag or can you actually buy always outranks a general figure.

Accuracy of calculations

We implement well-known, publicly documented formulas (see the methodology section on each calculator page and cooperative-extension and industry coverage standards as applicable). Even correctly implemented formulas produce estimates that depend on your inputs and assumptions. Real-world outcomes vary. Do not rely on a single web tool for a consequential decision.

Advertising disclosure

YardMath is funded by display advertising served through Google AdSense. Advertisers have no influence over our content, formulas, or editorial choices, and placement of an ad is not an endorsement.

Errors and corrections

If you spot an error, please email hello@yardmath.com with the inputs you used. Verified corrections are published promptly.