Livestock Feed Calculator
Calculate daily feed requirements based on animal type, weight, life stage, and herd size. Results include dry matter intake (DMI), protein and energy (TDN) needs, monthly feed quantities, and estimated costs.
Select an animal type and click Calculate Feed Requirements to see daily dry matter intake, protein and TDN needs, monthly feed quantities, and estimated costs. Adjust weight and head count for your specific operation.
Pre-Computed Feed Requirement Examples
Below are five common livestock feeding scenarios with pre-calculated results. These examples use typical body weights and grass hay as the default feed ($150/ton) for cost estimates. Click any example to see the full breakdown, or use the calculator above for custom parameters specific to your operation.
50 Beef Cows (Dry, 1200 lbs)
Est. monthly cost: $2,607.95
100 Dairy Cows (Mid Lactation)
Est. monthly cost: $13,781.25
20 Horses (Moderate Work)
Est. monthly cost: $1,406.25
200 Meat Goats (Lactating)
Est. monthly cost: $3,758.52
500 Broilers (Finisher)
Est. monthly cost: $498.58
Livestock Feed and Supplies
Quality feeds, supplements, and equipment for your operation.
How to Calculate Livestock Feed Requirements by Weight
Calculating the correct amount of feed for livestock begins with understanding dry matter intake (DMI), the single most important number in livestock nutrition. Dry matter intake represents the actual quantity of feed nutrients an animal consumes after removing all moisture. Every livestock species has a characteristic DMI expressed as a percentage of body weight: beef cattle consume approximately 2.0%, dairy cattle 3.5%, horses 2.0%, sheep 3.0%, and goats 3.5-4.0% of their body weight in dry matter each day.
To calculate the daily feed requirement for any animal, multiply the body weight by the DMI percentage. For a 1,200-lb beef cow at 2.0% DMI, the daily dry matter requirement is 24 lbs. This base requirement is then adjusted for life stage: lactating animals need 25-60% more feed than maintenance, growing young stock need 20-40% more, and dry or idle animals need 5-15% less. These adjustments reflect the dramatically different energy demands of producing milk, building muscle and bone in growing animals, or simply maintaining body weight.
Converting dry matter requirements to actual feed quantities requires knowing the moisture content of each feed. Hay at 88% dry matter requires dividing the DMI by 0.88 to get the as-fed amount. Corn silage at 35% dry matter requires dividing by 0.35, resulting in nearly three times the as-fed volume for the same dry matter intake. This conversion is critical for accurate feed ordering, storage planning, and cost estimation. Our calculator performs all of these conversions automatically, giving you both dry matter and as-fed quantities for any feed type.
Beyond total quantity, the quality of dry matter matters tremendously. Two key quality measures are crude protein (CP) percentage and total digestible nutrients (TDN). Each animal species and life stage has minimum requirements for both protein and energy. A lactating dairy cow needs 16-18% crude protein and 70% TDN, while a dry beef cow needs only 7% protein and 52% TDN. Matching feed quality to animal requirements prevents both underfeeding (which causes weight loss, reduced production, and health problems) and overfeeding (which wastes money and can cause metabolic disorders). The feed matching feature of this calculator shows whether a specific feed meets your animals' protein and energy requirements.
Understanding Feed Costs in Livestock Production
Feed costs represent the single largest expense in livestock production, typically accounting for 50-70% of total operating costs depending on the species and production system. For beef cow-calf operations, feed costs average $700-$1,200 per cow per year, with hay and winter supplement being the primary expenses. Dairy operations spend $3,000-$5,000 per cow per year on feed, reflecting the much higher nutritional demands of lactation. Poultry and swine operations, which rely entirely on purchased feed, have feed costs that represent 65-75% of total production costs.
The cost per ton of feed is only part of the equation. What matters most is the cost per unit of nutrition delivered, which accounts for moisture content and nutrient density. Corn silage at $50 per ton appears inexpensive until you realize it is 65% water. On a dry matter basis, corn silage costs $143 per ton of dry matter, which is comparable to grass hay at $150 per ton. However, corn silage provides 70% TDN compared to 52% for grass hay, making it the better energy value. This calculator automatically adjusts costs for moisture content, giving you an accurate picture of the true feeding cost per animal per day, per month, and per year.
Reducing feed costs without sacrificing animal performance is the key to profitable livestock production. Strategies include extending the grazing season through rotational grazing and stockpiled forages, purchasing feed in bulk during harvest season when prices are lowest, using byproduct feeds (distillers grains, beet pulp, brewers grains) that provide equivalent nutrition at lower cost, and matching animal nutrient requirements precisely to feed quality so that expensive high-protein supplements are used only where needed. Testing hay and forage quality through a commercial laboratory ($15-$30 per sample) provides the data needed to formulate the most cost-effective rations.
Frequently Asked Questions
How do I calculate how much feed my cattle need per day?
Cattle feed requirements are calculated based on dry matter intake (DMI), which is expressed as a percentage of body weight. For beef cattle, DMI is typically 2.0% of body weight, meaning a 1,200-lb cow needs approximately 24 lbs of dry matter per day. For dairy cattle, DMI is higher at 3.5% of body weight due to the energy demands of milk production. This base DMI is then adjusted for life stage: lactating cows consume 25-50% more than maintenance, while dry cows consume 15% less. To convert dry matter to as-fed feed, divide the DMI by the feed's dry matter percentage. For example, if feeding grass hay at 88% dry matter, a 1,200-lb beef cow needs 24 / 0.88 = 27.3 lbs of hay per day.
What is dry matter intake and why does it matter?
Dry matter intake (DMI) is the amount of feed an animal consumes after removing all moisture content. It matters because the moisture in feed provides no nutritional value but takes up space in the animal's digestive system. Feeds vary enormously in moisture content: hay is about 88% dry matter (12% moisture), corn silage is only 35% dry matter (65% moisture), and fresh pasture grass is about 25% dry matter (75% moisture). An animal eating 24 lbs of dry matter from hay would need about 27 lbs of as-fed hay, but the same animal would need about 69 lbs of corn silage or 96 lbs of fresh grass to get the same 24 lbs of actual nutrition. DMI is the universal measure that allows accurate comparison of feeds regardless of their moisture content.
How much does it cost to feed a cow per month?
The monthly feed cost for a beef cow ranges from $40 to $120 depending on the feed source, life stage, and regional hay prices. A dry beef cow eating 24 lbs of dry matter per day from grass hay at $150 per ton costs approximately $61 per month. A lactating dairy cow eating 49 lbs of dry matter per day from a mixed ration can cost $200-$350 per month. Feed costs represent 50-70% of the total cost of cattle production, making accurate feed calculations essential for profitability. Pasture-based systems have the lowest direct feed costs (as low as $15-25 per month in summer) but require significant land investment. Hay prices vary by region, quality, and season, with prices typically highest in late winter and spring.
What percentage of body weight should livestock eat per day?
The dry matter intake percentage varies by species and is based on the animal's digestive physiology and metabolic rate. Beef cattle consume 2.0% of body weight in dry matter, dairy cattle 3.5%, horses 2.0%, sheep 3.0%, goats 3.5-4.0%, pigs 3.0-5.0%, and poultry varies by species. These percentages represent maintenance levels and are adjusted up or down based on life stage. Lactating animals consume 25-60% more than maintenance, growing young stock 20-40% more, and dry or idle animals 5-15% less. Smaller animals generally consume a higher percentage of body weight because they have a higher metabolic rate per unit of body mass. A 5-lb laying hen eating 0.25 lbs per day is consuming 5% of body weight, while a 1,800-lb bison eating 36 lbs per day consumes only 2%.
What is TDN and how do I use it in feed calculations?
Total Digestible Nutrients (TDN) is a measure of the energy content of a feed, expressed as a percentage. It represents the sum of digestible crude protein, digestible crude fiber, digestible nitrogen-free extract, and 2.25 times the digestible ether extract (fat). Feeds with higher TDN values provide more energy per pound. Grass hay has about 52% TDN, corn has 88% TDN, and fat supplements can exceed 180% TDN due to the high caloric density of fat. To use TDN in calculations, compare the animal's TDN requirement to the TDN content of the feed. A lactating dairy cow needing 70% TDN cannot meet her energy needs from grass hay alone (52% TDN) and requires energy supplementation from grain or other high-TDN feeds. Matching TDN requirements to TDN supply is the foundation of practical livestock ration formulation.
Browse by Animal Type
Explore detailed feed requirements for each livestock species. Each animal page includes nutritional requirements by life stage, recommended feeds, and cost estimates based on typical rations.
Feed Types Reference
Compare nutritional profiles and costs for common livestock feeds. Each feed page includes detailed analysis of protein, energy, dry matter content, and which animals it is best suited for.