Editorial Policy
Who We Are
Agricalc is an independent web project offering free agricultural calculators, guides and glossary pages for farmers, gardeners and students worldwide. The site is run by a small team that writes and maintains all content in English, Spanish and French.
How Calculators Are Built
Every calculator implements a published agronomic or engineering formula. Seed rate tools use the standard plant-population method (row spacing x line spacing, thousand-grain weight and germination correction). Fertilizer tools use nutrient removal rates and commercial fertilizer analyses (e.g. urea 46% N, muriate of potash 60% K2O). Irrigation tools use the soil water balance with declared assumptions. Unit converters use exact SI/USDA-recognized conversion factors. Results are estimates: actual conditions vary with soil type, climate, variety and equipment.
Sources and References
Method references include FAO (including irrigation and drainage papers), USDA/NRCS publications, land-grant university extension materials (e.g. Minnesota, Nebraska, Florida Extension) and standard field-crop agronomy handbooks. Where a page lists references, they document the formulas implemented on that page.
Review & Updates
Content is reviewed when errors are reported and on a recurring basis; changes are dated in our sitemaps. If you spot a wrong number, formula or translation, please report it via the contact page - corrections are prioritized because farmers make input decisions with these tools.
Limitations & Disclaimer
Agricalc provides general educational estimates, not personalized agronomic, veterinary or financial advice. Local regulations, certified soil tests, seed labels and professional advice always take precedence. Never use calculator output as the sole basis for purchasing inputs or applying chemicals.
Affiliate Disclosure
Some outbound links (for example to Amazon) are affiliate links. If you buy through them we may earn a commission at no extra cost to you. Commissions never influence the order, wording or results of any content.
Accessibility of Results
All calculations run entirely in your browser. No data you enter is transmitted to or stored on a server, and no account is required.