Field-ready numbers for pasture, fence, hay, water, feed and ration blending, fertility and sprayer calibration, corn yield and grain drying shrink, storage, irrigation, equipment, breeding dates, tape weights, and livestock performance — 60 tools with formulas, worked examples, and planning disclaimers. Runs in your browser. No account.
Hay, DMI, rations, Pearson square, DM conversion, hay $/ton, FCR.
Perimeter, posts, paddocks, energizer joules.
Tanks, herd water, heaters, pond volume.
Acres, cattle & sheep stocking, AUMs.
Hay, grain bins, moisture shrink, silage, manure pit, compost.
Fertilizer, manure, lime, seed, sprayer calibration, corn yield.
Drip tape set time and well GPM runtime.
Ballast, fuel $/acre, trailer capacity.
Wean, shrink, ADG, tape weight, breeding dates for 5 species.
Bedding, broiler floor, bunk space, greenhouse BTU.
The Farm Mill is for field planning you can double-check: enter the acres, fence run, bale weight, or tank size you actually have, read the formula on the page, and compare the worked example before you order materials or change stocking.
Every calculator runs locally in the browser. Inputs are not uploaded to a Farm Mill server. Results are estimates for planning — not a substitute for Cooperative Extension, a surveyor, an engineer, a veterinarian, or a nutritionist.
Browse by category below, or open the A-Z tools directory. There are 60 tools on thefarmmill.com.
Most farm decisions take more than one number. These are common calculator chains, in the order that makes sense in the field.
Each step shows its own arithmetic, so if a final number looks wrong you can find the input that caused it.
Hay, dry-matter intake, ration blending, as-fed vs DM, hay price per ton, and poultry/swine FCR.
Perimeter, posts, rotational paddocks, and energizer sizing.
Tank gallons, herd water, heaters, and pond storage.
Acres, cattle and sheep stocking rates, and animal unit months.
Hay, bales, grain bins, silage, wagons, manure pits, and compost.
Fertilizer, manure, lime, seed, corn yield, sprayer calibration, spray batching, and frost windows.
Drip tape run time and well/pump GPM set hours.
Tractor ballast, diesel cost per acre, and trailer payload.
Weaning, shrink, ADG, tape weight, breeding dates for cattle, goats, sheep, pigs and horses, bull power, and flock eggs.
Bedding, poultry floor space, bunk length, and greenhouse heat load.
Each calculator keeps the arithmetic visible — inputs, intermediate steps, and a worked example — so you can catch a bad assumption before you order lime, seed, hay, fuel, or breeding stock. The library spans land and grazing (including AUM lease math), fence and water, ponds and manure storage, fertility, sprayer calibration and spray batching, corn yield and grain drying shrink, silage bags and bunkers, drip set time, tractor ballast and fuel cost per acre, ration blending and hay pricing, and livestock checks from tape weights and gestation dates for five species through feed conversion and bunk space.
The Farm Mill is an independent site with free calculators for farms and ranches, not affiliated with any dealer, seed company, or feed supplier. More on method and limits: About · Contact · Privacy.