Farm Calculators
Every calculator on the site, grouped by the job on the farm. Each one takes US or metric units, shows the formula and the steps with your numbers, keeps its inputs in the link so you can share or repeat a result, and prints a dated record. Nothing you type is uploaded.
Land and area
- Square foot to acre converter — square feet to acres and back, with m², yd² and hectares.
- Hectare to acre converter — hectares to acres and acres to hectares, one value or a list.
- Acreage calculator — lot size in acres from its sides or from GPS corner points.
- Acre per hour calculator — field capacity of a machine from speed, width and efficiency.
Soil fertility
- Fertilizer calculator — product rate for a target N, P2O5 or K2O, nutrients from a rate, and blends.
- Lawn fertilizer calculator — pounds per 1,000 sq ft and bags for a lawn.
- Lime calculator — lime per acre from the soil test, adjusted for product quality.
- Corn nitrogen rate calculator — lb N per acre from yield goal and credits, then urea, ammonia or UAN.
Crops and spraying
- Seeding rate calculator — seeds and pounds per acre, plant population from spacing.
- Sprayer calibration calculator — gallons per acre, nozzle flow and tank mix.
- Spray nozzle chart — flow by nozzle size and pressure, gallons per acre and the size to pick.
- Growing degree days calculator — daily and season GDD for corn and other crops.
Grain
- Corn yield calculator — bushels per acre from ear and kernel counts before harvest.
- Soybean yield calculator — bushels per acre from plants, pods and seeds.
- Grain bin capacity calculator — bushels in a round bin with peak and hopper.
- Corn moisture shrink calculator — water shrink and dry bushels after drying.
Water
- Irrigation calculator — drip flow and run time, application rate, pipe velocity.
- Sprinkler calculator — precipitation rate, run time and heads per zone for a lawn.
- Irrigation system design calculator — system flow from area and peak use, pipe friction loss and pump pressure.
- Pond volume calculator — gallons, acre-feet and liters for a rectangular, round, oval or irregular pond.
Livestock
- Cow gestation calculator — calving date, calving window and a gestation table.
- Hay calculator — tons and bales of hay for cattle, horses, sheep or goats.
- Egg incubation calculator — hatch date and lockdown day for chickens, ducks, geese, quail and more.