Livestock Feed Calculator
Calculate total feed required for a herd over a chosen feeding period from animal count, daily intake per animal, and feeding days. Use it for purchasing, storage planning, and cash flow projection before the feeding season.
Last updated: May 2026
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About this calculator
The formula is: totalFeed (kg) = numberOfAnimals × feedPerAnimal (kg/day) × feedingPeriod (days). Pure multiplication; no losses or wastage factor (add 10–15% manually if estimating purchase quantity vs net intake). Edge cases: zero values produce zero. Typical daily feed intake by animal class (on a dry matter basis): beef cattle finishing 9–13 kg DM/day (varies with body weight, ration energy density); beef cow on pasture 12–18 kg DM/day (depending on stage of lactation); dairy cow lactating high-producer 22–28 kg DM/day; dairy dry cow 12–16 kg DM/day; sow lactating 5–8 kg/day; sow gestating 2–3 kg/day; grow-finish pig 2–4 kg/day; broiler chicken (mature) 0.15–0.20 kg/day; layer chicken 0.10–0.12 kg/day; sheep ewe 2–4 kg/day; goat 2–4 kg/day. Note "as-fed" intake is higher than "dry matter" intake because feeds contain water — silage 30–40% DM means 1 kg DM = 2.5–3.3 kg as-fed; grain 86–88% DM (1 kg DM ≈ 1.15 kg as-fed); hay 88–92% DM. Always specify which basis (DM or as-fed) for clarity. The formula does not address feed quality or nutritional adequacy; it just sizes the total tonnage. For nutrition planning, work with a livestock nutritionist or use ration-balancing software (Cornell CNCPS, AMTS, Dalex, Hubbard Nutrition tools) that match the feed mix to animal requirements (protein, energy, minerals, vitamins). Feed cost is typically the largest variable expense in livestock production (50–70% of total cost in monogastric species; 40–60% in ruminants); accurate sizing avoids both shortages and over-buying.
How to use
Example 1 — Beef cattle finishing pen. 200 head finishing cattle, daily feed intake 11 kg DM/day per head, 150-day feeding period. Enter numberOfAnimals 200, feedPerAnimal 11, feedingPeriod 150. Result: 200 × 11 × 150 = 330,000 kg DM = 330 tonnes total feed. ✓ As-fed: at 80% DM average ration (high-moisture corn silage component lowers ration DM%), as-fed weight = 330/0.80 = ~413 tonnes total ration. Storage requirement: a typical farm bin holds 100–150 tonnes; multiple silos or commodity sheds needed. Cost at $0.30/kg DM = ~$99,000 total feed cost for the 200-head pen. Example 2 — Dairy lactating herd. 100 lactating cows, 26 kg DM/day per cow, 305-day lactation. Enter 100, 26, 305. Result: 100 × 26 × 305 = 793,000 kg DM = 793 tonnes DM over the lactation. ✓ This is the dry matter intake; as-fed weight varies with ration. Typical TMR (Total Mixed Ration) is ~50% DM, so as-fed = 793/0.50 = ~1,586 tonnes as-fed over 305 days. Daily ration storage: at 793,000/305 = 2,600 kg DM/day average herd intake. For pasture-based dairy, pasture supplies much of the intake during grazing season and the formula calculates supplemental feed needed; for confinement dairy, the full amount must come from purchased and homegrown feeds.
Frequently asked questions
What's the difference between dry matter intake and as-fed intake?
Dry matter (DM) is the feed minus its water content; as-fed is the total weight including water. The distinction matters because feeds vary widely in water content: corn silage 30–40% DM (60–70% water); haylage 40–55% DM; dry hay 88–92% DM; grain 86–88% DM; brewers grains wet 25–30% DM; brewers grains dry 88–90% DM. An animal "eats" a certain amount of dry matter (the actual nutritional substance); the as-fed weight to deliver that DM depends on the feed mix. Example: a cow eating 25 kg DM/day on a high-silage ration (50% DM) consumes 50 kg as-fed; on a high-grain ration (75% DM) consumes 33 kg as-fed. Always specify which basis when planning. Nutrition calculations work in DM (protein, energy per kg DM); ordering and storage work in as-fed (truck loads, bin volumes); economic analysis works in either as long as consistent. Most rations are formulated in DM; conversion to as-fed amounts comes at the mixing step. For TMR (Total Mixed Ration) operations, mixer scales weigh as-fed amounts of each ingredient according to a recipe based on DM percentages of each ingredient.
How do I match feed to nutritional requirements?
Use a ration-balancing approach matched to your species. Beef and dairy cattle: nutritionist services (independent or feed supplier-provided) develop rations matched to animal weight, milk production, body condition, growth target, and environmental conditions. Cornell CNCPS, AMTS, NRC Beef/Dairy software are industry standards. Pigs and poultry: feed supplier formulates by phase (starter, grower, finisher) to match growth curves; modern pig and poultry production runs 4–6 phase feeding for precision nutrition. Sheep and goats: NRC publications and extension services provide species-specific guidelines; less precision than dairy but adequate for most operations. Key nutritional parameters: crude protein (CP) %; energy (Net Energy for Maintenance and Gain in ruminants; Metabolizable Energy in poultry); amino acid balance especially lysine, methionine, threonine (most critical in monogastrics); calcium and phosphorus; vitamin A, D, E; trace minerals (copper, zinc, selenium). Over-feeding any nutrient wastes money; under-feeding limits production. For best results, sample your forages and grains for actual nutrient analysis (not assumed book values) — analysis costs $15–$30 per sample and pays back many times over in ration accuracy.
How much feed waste is typical and how do I reduce it?
Substantial in most operations. Hay feeding (round bales without rings): 25–45% waste through trampling and pulling out. With hay rings: 10–20% waste. With cone or basket feeders: 5–15% waste. Bunk feeding TMR: 3–8% waste with well-designed feeding bunks and good management; up to 15% with poor design or management. Pasture: grazing efficiency 30–70% (the rest is trampled, fouled, or refused); rotational grazing increases efficiency to 60–80%. Silage at the bunker face: 5–15% spoilage and air exposure loss. Bagged feed in storage: 1–5% rodent and weather loss in good storage. Reducing waste: 1) Good bunk and feeder design — keep feed off the ground; 2) Twice-daily feeding for high-production animals (more frequent than once daily reduces sorting and refusals); 3) Rotational grazing instead of continuous; 4) Proper silage packing and covering; 5) Pest control in stored feeds (rodents, birds, insects); 6) Regular bunk score evaluation and adjustment of feed amounts to actual intake; 7) Consistent ration delivery (eliminating "out of feed" periods); 8) Animal sorting by intake class (heifers vs cows; growing vs finishing). Top-quartile operations achieve total feed efficiency 15–25% better than average; the difference is largely management not equipment.
What are the most common livestock feeding mistakes?
The biggest is feeding too much or too little — both under-feed nutrients (underweight, low production) or waste resources (overweight breeding stock has reproductive problems, over-conditioned dairy cows have peripartum disease, finishing animals over-conditioned waste feed at low marginal gain). Match intake to body condition score targets. The second is feeding inconsistent rations day to day; rumen microbes adapt to a specific diet and changes >10% per day cause acidosis and reduced intake. The third is poor mineral supplementation — feeding salt and a generic mineral block may miss critical trace minerals (selenium, zinc, copper); use a region- and species-specific mineral supplement. The fourth is failing to test feed quality; assuming "average" hay protein and energy when actual values differ 30–50% from book values produces ration imbalance. The fifth is not adjusting for environmental conditions — cold winter increases maintenance energy needs 15–30%; heat stress drops intake 10–25% in dairy and feedlot cattle. The sixth is feeding moldy or spoiled feed; mycotoxins reduce intake, suppress immune function, and cause reproductive problems. Reject moldy hay and silage; test grain in problem years. The seventh is buying cheap feed without total economic analysis — a "cheaper" feed with 20% worse FCR costs more total than the higher-priced option with better efficiency. The eighth is failing to monitor and adjust — bunk score evaluation daily, body condition score monthly, weight monthly (or 21-day intervals for finishing); the data tells you whether the ration is working. The ninth is using outdated NRC values; updates every 10–15 years reflect new science on amino acid balance, trace mineral requirements, and energy needs.
When should I not use this calculator?
Skip it for grazing-based systems where pasture supplies most or all of the diet; use pasture-stocking-rate and animal-unit-month calculations instead. It is the wrong tool for nursery and very young animals (calves on milk, weaned piglets, baby chicks) where intake changes rapidly day to day; use age-specific phase-feeding charts. Do not use it for sick or recovering animals where intake is severely reduced; veterinary nutrition support is needed. For aquaculture, factor in feed conversion ratio differences (fish FCR 1.0–1.5 vs cattle 6–8) and the unique water-soluble feeding patterns; use aquaculture-specific feeding charts. For pet food and companion animal nutrition, use pet-food guidelines from manufacturer or veterinarian, not livestock formulas. For breeding-stock and gestating animals where weight gain is not the production target, use maintenance plus reproductive-state-specific intake needs from NRC. For very small backyard operations (a few hens, a couple of goats), the formula works but the costs are negligible enough that ordering 25 kg bags as needed beats long-term planning. For range cattle where weather and forage availability change weekly, use rolling estimates rather than fixed-period totals; supplemental feeding plans should be flexible. And for cellulose-heavy specialty rations (some sheep and goat operations using brush and browse), the standard intake-per-day-per-head guides may need significant adjustment.