Agriculture & Farming

Free Crop Water Requirement (ETc) calculator using FAO-56 crop coefficients. Calculate daily and seasonal irrigation needs, effective rainfall, gross irrigation requirements, and irrigation scheduling for 35+ crops across all growth stages.

Free Crop Yield Calculator — estimate grain and vegetable yields in bushels per acre, tonnes per hectare, or total weight. Supports corn, wheat, soybeans, tomatoes, and more.

Free NPK Fertilizer Calculator — determine exactly how much fertilizer you need, what nutrients you are applying, and how to blend multiple fertilizer products for optimal plant nutrition.

Free Irrigation Water Calculator — calculate irrigation run time, water volume per event, irrigation interval, precipitation rate, and soil water balance using FAO-56 methods. Supports drip, sprinkler, pivot, and flood systems with metric and imperial units.

Free Nitrogen Application Calculator — determine the precise amount of nitrogen fertilizer needed for your crops by accounting for yield goals, soil nitrate levels, legume rotation credits, manure and cover crop credits, fertilizer form, and application efficiency. Supports corn, wheat, barley, sorghum, potato, and more.

Free NPK Calculator — analyze fertilizer blend ratios, decode label nutrition content, and optimize mixing proportions to hit a target N-P-K rate for your crop or lawn.

Free Planting Density Calculator — calculate plants per acre, hectare, or square foot from row and in-row spacing. Supports square, triangular, hexagonal, and diamond patterns with 14 crop presets and seed requirement estimates.

Free Seed Rate Calculator — determine the optimal seeding rate in lbs/acre, kg/ha, and seeds/acre for corn, wheat, soybeans, canola, and 14 other crops. Accounts for germination, field emergence losses, seed purity, and seeding method.

Free Seeding Rate Calculator — determine the optimal pounds per acre (lbs/acre) or kilograms per hectare (kg/ha) of seed to plant for any crop. Supports 14 crops with presets, TKW/seeds-per-lb toggle, germination and emergence loss inputs, total seed cost, and stacked-bar seed fate chart.

Free Soil pH Calculator — determine exactly how much agricultural lime or elemental sulfur you need to raise or lower your soil pH to the ideal level for your crop. Enter your current pH, target pH, soil texture, and field area for instant, research-backed amendment recommendations.