How do you calculate total feed needed for a herd?

Multiply head count by dry matter intake per head per day by the number of feeding days, then by a waste factor. For 120 head at 26 lb DM over 14 days with a 1.05 waste factor, that is 45,864 lb of dry matter.

What is dry matter intake and why use it?

Dry matter intake is how much feed an animal eats after all moisture is removed. Nutritionists balance rations on a dry matter basis so that wet feeds like silage and dry feeds like hay can be compared and combined fairly.

How much does a beef cow eat per day?

A mature beef cow typically eats about 2 to 2.5 percent of body weight in dry matter daily, roughly 24 to 30 lb DM for a 1,200 lb cow. The 26 lb DM default sits squarely in that range.

Why add a waste factor to feed calculations?

Feed is lost to bunk refusal, trampling, wind, spoilage, and shrink during handling. A 1.05 factor adds 5 percent to cover it; bale feeders without cones or open bunks may justify 10 to 20 percent.

How do I convert dry matter pounds to as-fed pounds?

Divide the dry matter amount by the feed's dry matter percentage. If hay is 88 percent dry matter, 45,864 lb DM is about 52,118 lb as-fed, which is what you actually load and weigh.

Does this account for different animal classes in one group?

No, it applies one average intake to all head. For a mixed group of cows, calves, and replacements, run separate calculations or use a weighted-average intake to avoid under- or over-feeding.

Agriculture, Soil, Fertilizer & Farm Operations calculator

Livestock Feed Ration Calculator

This calculator sizes the total feed dry matter a livestock group will consume over a planning period, which is the number a producer needs to book hay, order commodities, or check that on-hand inventory will last to grass. It works in dry matter, the fraction of feed left after moisture is removed, because that is how nutritionists balance rations and how intake targets are set. Cattle, dairy, sheep, and feedlot managers use it to turn a per-head daily intake into a group-level tonnage, then pad it for the unavoidable waste and shrink that happens at the bunk. Underestimate and you run short mid-winter; overestimate and capital sits in a stack losing quality.

What this calculator does

Estimate total livestock feed ration from head count, dry matter intake per head, feeding days, and ration adjustment factor.
Use it to plan feed inventory, ration batches, or grazing supplement needs for a group of animals.
It computes total feed dry matter required by multiplying head count, per-head daily dry matter intake, feeding days, and a waste adjustment factor.

Formula used

Feed required = head count x dry matter intake x feeding days x adjustment factor

Inputs explained

Animals in feeding group: Use the head count for the group being fed the same ration.
Dry matter intake per head per day: Use nutritionist guidance or measured intake for the class of livestock.
Feeding period length: Use days covered by this feed plan or inventory check.
Feed waste and shrink factor: Use 1.05 to add 5 percent waste or shrink.

How to use the result

Use it when planning a feeding period, sizing a hay or commodity purchase, or checking whether current inventory covers the group to a target date.
It uses a single average intake for the whole group and does not adjust for changing intake as animals grow, weather swings, or ration density changes over the period.

Current U.S. benchmarks

U.S. manufacturing runs at 75.6% of capacity (Federal Reserve, Jun 2026). New factory orders are up 2.3% year over year (Census).
Industrial natural gas averages $4.9 per Mcf (EIA, Apr 2026), down 7.7% from a year earlier, with industrial electricity at 8.66 cents per kWh. Process heating and refrigeration budgets track both.

Common questions

How do you calculate total feed needed for a herd? Multiply head count by dry matter intake per head per day by the number of feeding days, then by a waste factor. For 120 head at 26 lb DM over 14 days with a 1.05 waste factor, that is 45,864 lb of dry matter.
What is dry matter intake and why use it? Dry matter intake is how much feed an animal eats after all moisture is removed. Nutritionists balance rations on a dry matter basis so that wet feeds like silage and dry feeds like hay can be compared and combined fairly.
How much does a beef cow eat per day? A mature beef cow typically eats about 2 to 2.5 percent of body weight in dry matter daily, roughly 24 to 30 lb DM for a 1,200 lb cow. The 26 lb DM default sits squarely in that range.
Why add a waste factor to feed calculations? Feed is lost to bunk refusal, trampling, wind, spoilage, and shrink during handling. A 1.05 factor adds 5 percent to cover it; bale feeders without cones or open bunks may justify 10 to 20 percent.
How do I convert dry matter pounds to as-fed pounds? Divide the dry matter amount by the feed's dry matter percentage. If hay is 88 percent dry matter, 45,864 lb DM is about 52,118 lb as-fed, which is what you actually load and weigh.

Last reviewed 2026-05-12.