How this calculator works
This tool calculates one base seasonal hay need from head count, average weight, intake percentage, and no-pasture days. For a cattle-specific starting count, use the cattle hay calculator, then carry the same herd assumptions here. The comparison runs that base through two purchase plans. Square and round bales each receive their own weight, price, and feeding-waste rate, while storage waste stays shared. Each waste layer is multiplied onto the base need, the adjusted pounds are divided by bale weight, and the result rounds up to whole bales before total cost is compared.
The catch is that price per bale is not a fair comparison. A round bale costs more per bale but contains far more hay; it can also lose up to 57% without a feeder, compared with about 19% at the listed feeder setting. The “Effective / ton” line now divides whole-bale purchase cost by the herd's base tons before waste. That makes it an effective cost for the hay the plan is intended to supply, with waste and bale rounding included—not the seller's raw price per ton. The winner callout uses total season cost, and it reports a tie explicitly.
The right choice still depends on the farm. Equipment for moving rounds, the ability to keep a feeder filled, storage access, labor, and local quotes can outweigh a small dollar difference. Normalize those quotes with the hay price converter, then compare the winning load's footprint in the hay storage calculator. Enter actual bale weights rather than nominal sizes, compare both feeding methods, and rerun the page when prices change. If one price is missing, the page keeps the individual bale counts but asks for both prices before naming a cheaper option.
Method and waste figures follow N.C. Cooperative Extension ("Calculating Winter Hay Needs"), Penn State Extension ("Buying Winter Hay for Horses"), University of Maryland Extension, and Nutrena/University of Minnesota (K. Martinson, "Estimating Winter Hay Needs") — the same multiplicative waste method and feeding-waste rates used across every BaleMath calculator. Estimates only — confirm actual bale weight and local pricing before buying.
Frequently asked questions
Are round bales or square bales cheaper?
It depends on bale weight, price, and waste. This calculator compares whole-bale season cost after applying each feeding method; the lower sticker price per bale is not necessarily the cheaper plan.
Do round bales waste more hay than square bales?
Fed without a feeder, round bales can waste up to 57% versus about 13% for square bales fed on the ground. With a feeder or rack, both drop to roughly 3-19% waste, closing most of the gap.
Is it cheaper to feed round bales with a feeder or without?
A round-bale feeder usually reduces waste versus feeding without one. Compare the two feeding settings, then weigh the calculator's seasonal hay savings against the feeder's actual purchase price.
Plan the rest of the barn
BaleMath is free to use. Numbers are planning estimates, not veterinary or nutritional advice.