Free Agricultural Calculators
Free Agricultural Calculators for Farmers
184 free calculators for fertilizer rates, seed rates, crop yields, livestock management, irrigation, and farm economics.
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Fertilizer & Soil
NPK rates, lime, compost, and nutrient calculators for 22 crops.
View calculatorsSeed & Planting
Seed rates, plant spacing, germination, and cost per acre.
View calculatorsPlanting Date
When to plant 44 crops by USDA hardiness zone.
View calculatorsCrop Yield
Yield per acre, harvest loss, grain moisture, and storage.
View calculatorsLivestock
Feed conversion, weight, stocking rate, hay, and gestation.
View calculatorsIrrigation & Water
Drip, sprinkler, water cost, pond sizing, and well yield.
View calculatorsFarm Economics
Profit/loss, break-even, land value, loans, and ROI.
View calculatorsConversions
Bushels to tons, acres to hectares, lbs/acre to kg/ha.
View calculatorsMost popular calculators
The tools farmers use most — jump straight to the calculator you need.
Mulch Calculator
Cubic yards and bags for any area
NPK Fertilizer Calculator
Nitrogen, phosphorus, and potassium rates
Compost Calculator
Volume and weight for garden beds
Cattle Weight Calculator
Estimate weight from girth and length
Soil Volume Calculator
Raised beds, gardens, and fill
Seed Rate Calculator
Pounds of seed per acre
Hay Bale Calculator
Bales needed for winter feeding
Farm Loan Calculator
Monthly payment and total interest
Bushels to Tons Converter
Grain weight by crop type
Corn Fertilizer Calculator
NPK rates for corn per acre
Lime Application Rate
Tons of lime from soil pH
Plant Spacing Calculator
Plants per acre from row spacing