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Free agriculture calculators for growing degree days, chill hours, planting schedules, and crop planning. Optimize your farm or garden.
Calculate heat units for crop growth and development
Calculate accumulated chill hours for fruit trees
Calculate plants or seeds needed for any field size
Calculate fertilizer rates based on NPK requirements
Calculate fertilizer costs per nutrient and per acre
Calculate rainwater collection potential from your roof
Calculate soil needed for pots, planters, and raised beds
Calculate carbon-to-nitrogen ratio for optimal composting
Calculate how much compost you need for gardens and beds
Calculate nitrogen, phosphorus, and potassium from any fertilizer blend
Calculate optimal seeding rates for crops based on Pure Live Seed
Estimate corn grain yield before harvest using ear samples
Estimate harvest yields for 12 crop types based on conditions
Calculate irrigation water needs using FAO Penman-Monteith
Calculate water footprint per kg of crop using global standards
Calculate soil organic carbon stock and sequestration potential
Calculate lime or sulfur needed to adjust soil pH for optimal plant growth
Calculate when to harvest crops based on planting date and growing conditions
Calculate rainfall deficit and drought severity for water management
Calculate optimal plant spacing for gardens, raised beds, and rows
Calculate reference ET and crop water needs using FAO Penman-Monteith
Calculate tank mix, spray rates, and application rates for pesticides
Calculate gallons per acre (GPA), nozzle output, and sprayer calibration
Calculate Delta T for optimal pesticide spraying conditions
Calculate vapor pressure deficit for optimal plant growth
Calculate irrigation runtime, emitters needed, and water volume
Calculate optimal irrigation timing, frequency, and water amounts
Calculate diesel fuel consumption and costs for farm tractors
Calculate optimal cattle stocking rates for your pasture
Calculate agricultural lime requirements for soil pH adjustment
Whether you're a farmer, gardener, or land manager, our agricultural calculators help you make data-driven decisions. Calculate fertilizer needs, planting schedules, yield estimates, and more for optimal results.
Make precise calculations for fertilizer, irrigation, and spacing to maximize crop production.
Apply the right amount of inputs to avoid over-application and environmental runoff.
Calculate planting dates, harvest windows, and rotation schedules.
Estimate costs and potential returns for agricultural projects.
Balance productivity with environmental stewardship through informed decisions.
From backyard gardens to large farms, these tools scale to your needs.
Select the calculator matching your agricultural need.
Enter your land area, soil conditions, or crop specifications.
Review calculated recommendations for inputs, timing, or expected outputs.
Adjust parameters to see how changes affect results.
Apply the recommendations and track actual results for future refinement.
Determine seed quantities, row spacing, and expected yields for your plot size.
Calculate precise fertilizer amounts based on soil tests and crop requirements.
Estimate water needs based on crop type, climate, and soil conditions.
Calculate feed requirements, pasture capacity, and production estimates.
Yes, our calculators work for both conventional and organic methods. Simply input your organic-approved fertilizers and amendments for accurate calculations.