About Frost & Furrow

Frost & Furrow is a small, independent collection of free garden calculators. It is built and maintained by a software developer and home vegetable gardener who wanted fast, ad-light tools with the math and sources shown.

How we work

• Every calculator uses a published method, usually from a university extension service, and links to it.
• Formulas are printed on the page with a worked example.
• Automated tests check each calculator against the examples in its sources.
• We correct errors quickly — report one here.

How the site is funded

The tools are free. The site may show ads and include affiliate links; see the affiliate disclosure and privacy policy. Advertisers do not influence the math.