Agriculture Calculators
Chicken Feed Calculator
Calculate total daily feed needed for a flock from standard per-bird reference intake for layers, broilers at each growth stage, and young chicks.
Compost C:N Ratio Calculator
Calculate the blended carbon-to-nitrogen (C:N) ratio when combining carbon-rich and nitrogen-rich compost materials.
Crop Evapotranspiration Calculator
Calculate crop water use (ETc) from reference evapotranspiration and crop coefficient using the standard FAO method.
Crop Irrigation Calculator
Calculate gross irrigation depth and water volume needed from crop evapotranspiration, effective rainfall, field area, and system efficiency percentage.
Crop Yield Calculator
Calculate crop yield in kg per hectare and per acre from harvested weight and field area, with support for tons, pounds, and quintals as units.
Feed Conversion Ratio Calculator
Calculate Feed Conversion Ratio (FCR) from feed consumed and weight gain to measure livestock feed efficiency.
Fertilizer Calculator
Calculate the actual fertilizer product weight needed from a target nutrient rate, field area, and the product's nutrient content percentage on the label.
Fertilizer Nutrient Application Calculator
Calculate the actual pounds of nutrient delivered per acre from a fertilizer blend's application rate and nutrient percentage.
Grain Moisture Shrinkage Calculator
Calculate grain shrinkage percentage and final weight after drying from initial and final moisture percentages.
Grain Storage Calculator
Calculate cylindrical grain bin storage capacity in tonnes and bushels from bin diameter, fill height, and the specific grain type's bulk density.
Horse Feed Calculator
Calculate daily dry matter intake for a horse based on body weight and workload, split between forage and concentrate portions of the daily diet.
Land Area Calculator
Convert land area between hectares, acres, square meters, square feet, bigha, and square kilometers, or calculate area from length and width directly.
Livestock Feed Calculator
Calculate daily dry matter feed requirements for dairy cattle, beef cattle, sheep, goats, horses, and pigs from body weight and herd size together.
Manure Nutrient Value Calculator
Calculate the equivalent fertilizer dollar value of applied manure based on its nutrient content.
Nitrogen Use Efficiency Calculator
Calculate nitrogen use efficiency (NUE) from yield with and without nitrogen and total nitrogen applied.
Pesticide Dosage Calculator
Calculate pesticide quantity needed from a recommended rate per unit area, or scale a per-100-liter tank mix rate to your actual tank volume.
Plant Population Calculator
Calculate expected final plant population per acre from seeding rate, germination rate, and field emergence rate.
Seed Rate Calculator
Calculate seed rate in kg per hectare and per acre from row spacing, plant spacing, 1000-seed weight, germination rate, and seed purity percentage.
Silage Dry Matter Calculator
Calculate dry matter percentage of forage from wet and dry sample weights to check readiness for ensiling.
Stocking Rate Calculator
Calculate pasture stocking rate in Animal Units per acre from livestock weight, headcount, and pasture acreage.
Planning a Season Before It Starts
Farming decisions — how much seed to buy, how much fertilizer to apply, how much feed a herd needs through winter — all come down to matching quantity to area or head count ahead of time, when a shortage or surplus is expensive to correct later. These ten calculators handle that planning math for crops and livestock alike.
Diminishing Returns From Fertilizer
| Application Rate | Yield | Gain Over Previous Step |
|---|---|---|
| None | 3.0 tons/ha | — |
| 50 kg/ha | 4.2 tons/ha | +40% |
| 100 kg/ha | 4.8 tons/ha | +14% |
| 200 kg/ha | 5.0 tons/ha | +4% |
Each additional unit of fertilizer produces less extra yield than the one before it — the classic diminishing-returns curve familiar to agronomists, and part of why more is not automatically better once yield gains no longer justify the added cost (or the runoff risk to nearby water systems). The Fertilizer Calculator and Crop Yield Calculator help find that application rate.
Popular Agriculture Calculators
- Livestock Feed Calculator — totals daily and seasonal feed requirements for a herd by weight and species.
- Crop Irrigation Calculator — estimates water requirements per acre based on crop type and climate.
- Seed Rate Calculator — converts target plant density into the seed quantity needed per area.
Managing a home garden instead of a farm? See the Gardening Calculators, or check land and resource planning in Environmental Calculators.