Agriculture & Garden

Seed rates, spacing, fertiliser, lime, compost and yield.

• Compost C:N Ratio Calculator The carbon to nitrogen ratio and moisture of a compost mix, and how much of a material brings it to your target.
• Crop Yield Estimate Calculator Estimate grain yield before harvest from heads per square metre, grains per head and thousand grain weight.
• Fertiliser Blending Calculator How much of three fertilisers to mix, and how much filler, to make a batch at a target NPK grade.
• Fertiliser Quantity Calculator How much fertiliser (fertilizer) to apply to supply a target amount of N, P or K, per hectare, per acre and for your whole area.
• Greenhouse Heating Calculator The heater size a greenhouse needs to hold a temperature on the coldest night, from its size, covering, air leakage and temperatures.
• Growing Degree Days Calculator Growing degree days from daily high and low temperatures, using a base temperature, with the simple or capped method, for a day or a season.
• Harvest Estimate Calculator Forecast a field’s total harvest, range and truckloads from sample cuts you weigh.
• Lime Requirement Calculator How much of your liming product to spread, from a soil test recommendation and the product’s neutralising value.
• Manure Application Rate Calculator How much manure or slurry to spread to meet a crop’s nitrogen need, from its tested nutrient content, with the phosphate and potash it adds.
• NPK Ratio Calculator The ratio behind a fertiliser grade such as 20-10-10, the nutrient weight in a bag, and the elemental P and K it contains.
• Plant Population and Row Spacing Calculator Plants per hectare or acre from row and in-row spacing, or the row spacing or in-row spacing that gives a target population.
• Plant Spacing Calculator How many plants fit in a bed at a given spacing, in a square grid or an offset triangular pattern.
• Seed Rate Calculator Seed rate in kg/ha and lb/acre from your target plant population, thousand seed weight, germination and field establishment.
• Yield per Hectare and Acre Calculator Crop yield per hectare and per acre from the amount harvested and the area, in tonnes, tons, pounds and bushels.

Irrigation, drip flow, rainfall and spray tank mixes.

• Drip Irrigation Flow Calculator Total flow, application rate and run time for a drip system, from emitter flow and spacing.
• Evapotranspiration Calculator (Hargreaves) An estimate of reference evapotranspiration (ET₀) from temperature, latitude and date, using the Hargreaves-Samani equation.
• Irrigation Water Requirement Calculator How much water a crop needs over a period, from evapotranspiration, crop coefficient, rainfall and irrigation efficiency.
• Pesticide Dilution Calculator How much product to add to a knapsack or hand sprayer, from the dilution rate on the label.
• Rainfall to Volume Calculator Turn millimetres or inches of rain on a field, garden or yard into litres, gallons and cubic metres.
• Spray Tank Mix Calculator Product per tank, hectares or acres per tank and tanks for a field, from the rate on the label and your water volume.
• Sprinkler Run Time Calculator How long to run sprinklers to apply a set depth of water, from a catch-cup test or the head flow and spacing.

Stocking rates, feed, silage, grain and silos.

• Animal Water Requirement Calculator Daily water for a herd or flock, the storage to hold in reserve and the flow to refill it, from your own per-head figure.
• Grain Moisture Shrink Calculator The weight of grain after drying, the water removed and the shrink per point of moisture.
• Grain Storage Volume Calculator The volume, tonnage and bushels of grain in a flat store, a ridged heap or a conical pile.
• Livestock Feed Ration Calculator Turn a dry matter requirement into as-fed daily amounts of up to three feeds, per head and for the herd, with the protein of the mix.
• Silage Requirement Calculator How many tonnes of silage a herd needs for the winter, the clamp size to hold it and the area to grow it.
• Silo and Grain Bin Capacity Calculator The capacity of a round silo or grain bin, in cubic metres, tonnes and bushels, including a peak and hopper, and the contents at a given depth.
• Stocking Rate Calculator How many animals a pasture can carry, from forage production, utilisation and animal intake, with head and animal units per hectare or acre.