Poultry Feed Calculator
Calculate daily and total feed requirements for poultry flocks by bird type and age. Enter values for instant results with step-by-step formulas.
Calculator
Adjust values & calculateA 50-lb bag at $14 = $0.28/lb
Formula
Feed consumption per bird varies by type and age. Layers eat ~0.25 lbs/day at peak production. Broilers eat ~0.33 lbs/day during finishing. Feed is divided into phases: Starter (high protein, young birds), Grower (moderate protein), and Layer/Finisher (adjusted for production). Monthly cost = Total daily feed × 30 × price per pound.
Last reviewed: December 2025
Worked Examples
Example 1: Small Backyard Layer Flock
Example 2: Commercial Broiler Batch
Background & Theory
The Poultry Feed Calculator applies the following established principles and formulas. Agricultural calculators integrate principles of agronomy, soil science, hydrology, and animal husbandry to optimize production and resource efficiency. Crop yield is expressed as mass per unit area, typically tonnes per hectare (t/ha) or bushels per acre, and is influenced by variety genetics, soil fertility, water availability, and pest management. Irrigation efficiency encompasses precipitation rate (the depth of water applied per unit time, in mm/hr) and application efficiency (the fraction of applied water that is beneficially used by the crop), with drip irrigation typically achieving 90–95% efficiency compared to 50–70% for flood irrigation. Fertilizer composition is described by the NPK ratio, representing the percentage by weight of available nitrogen (N), phosphorus expressed as P₂O₅, and potassium expressed as K₂O in a given product. Soil pH critically affects nutrient availability: most macronutrients are most available between pH 6.0 and 7.0, while iron and manganese become more soluble below pH 5.5, risking toxicity. Buffering capacity describes a soil's resistance to pH change and depends on cation exchange capacity and organic matter content. Growing Degree Days (GDD) accumulate thermal units above a crop-specific base temperature to predict phenological development: GDD = ((Tmax + Tmin) / 2) − Tbase, summed daily over the growing season. For corn, Tbase = 10°C; for wheat, Tbase = 0°C. Livestock feed conversion ratio (FCR) is calculated as kg of dry feed consumed divided by kg of live weight gained; broiler chickens typically achieve FCR values near 1.8–2.0, while beef cattle commonly range from 6 to 8. Seed germination rate is the percentage of viable seeds that successfully emerge under standard conditions and is used to calculate seeding rates. Harvest index (HI) is the ratio of economically valuable yield (grain, fruit) to total above-ground biomass, typically 0.4–0.6 for modern cereal varieties.
History
The history behind the Poultry Feed Calculator traces back through the following developments. Agriculture represents humanity's most consequential technological transition, fundamentally reshaping population dynamics, social organization, and ecosystems over the past twelve millennia. The Neolithic agricultural revolution began independently in multiple regions around 10,000 BCE, with early cultivation of wheat and barley in the Fertile Crescent, rice and millet in China, and maize in Mesoamerica. These transitions from hunter-gatherer lifestyles enabled food surpluses, permanent settlements, and the emergence of complex civilizations. Ancient farmers developed crop rotation empirically over centuries, alternating cereals with legumes to restore soil fertility — a practice later understood through the nitrogen fixation performed by rhizobial bacteria in legume root nodules. The Roman agricultural writer Columella systematically described field management practices in De Re Rustica around 60 CE, including plowing depth, manuring rates, and vine cultivation, representing early evidence-based agronomy. The pace of agricultural innovation accelerated markedly in the eighteenth century. Jethro Tull's seed drill, introduced around 1701, enabled precise row planting and mechanical weeding, dramatically improving seed utilization efficiency compared to broadcast sowing. Thomas Malthus published An Essay on the Principle of Population in 1798, warning that population growth would outpace food production — a concern that motivated subsequent generations of agricultural scientists. Gregor Mendel's pea plant experiments in the 1860s established the genetic principles that underpinned twentieth-century crop breeding programs. The Green Revolution of the 1960s, led by Norman Borlaug and colleagues, introduced semi-dwarf, high-yielding wheat and rice varieties combined with synthetic fertilizers and expanded irrigation infrastructure, averting predicted famines and increasing global cereal production by an estimated 250% between 1960 and 2000. The late twentieth and early twenty-first centuries brought GPS-guided precision agriculture, remote sensing of crop stress, and genetically modified organisms with engineered pest resistance and herbicide tolerance, alongside ongoing debate about their ecological and economic implications for farming systems worldwide.
Frequently Asked Questions
Formula
Total Daily Feed = Feed Per Bird/Day × Number of Birds
Feed consumption per bird varies by type and age. Layers eat ~0.25 lbs/day at peak production. Broilers eat ~0.33 lbs/day during finishing. Feed is divided into phases: Starter (high protein, young birds), Grower (moderate protein), and Layer/Finisher (adjusted for production). Monthly cost = Total daily feed × 30 × price per pound.
Worked Examples
Example 1: Small Backyard Layer Flock
Problem: Calculate weekly feed needs and cost for 12 laying hens at 24 weeks old, with feed priced at $0.28 per pound.
Solution: Bird type: Layer, Age: 24 weeks (Layer phase)\nDaily feed per bird: 0.25 lbs (4 oz)\nTotal daily feed: 0.25 × 12 = 3.0 lbs\nWeekly feed: 3.0 × 7 = 21.0 lbs\nMonthly feed: 3.0 × 30 = 90.0 lbs\nDaily cost: 3.0 × $0.28 = $0.84\nWeekly cost: $0.84 × 7 = $5.88\nMonthly cost: $0.84 × 30 = $25.20\n50-lb bags per month: 2
Result: Weekly feed: 21 lbs ($5.88) | Monthly: 90 lbs ($25.20)
Example 2: Commercial Broiler Batch
Problem: Calculate daily feed for 500 broiler chickens at 5 weeks old, with feed priced at $0.22 per pound.
Solution: Bird type: Broiler, Age: 5 weeks (Grower phase)\nDaily feed per bird: 0.18 lbs (2.9 oz)\nTotal daily feed: 0.18 × 500 = 90.0 lbs\nWeekly feed: 90.0 × 7 = 630.0 lbs\nMonthly feed: 90.0 × 30 = 2,700.0 lbs\nDaily cost: 90.0 × $0.22 = $19.80\nWeekly cost: $19.80 × 7 = $138.60\nMonthly cost: $19.80 × 30 = $594.00\n50-lb bags per month: 54
Result: Weekly feed: 630 lbs ($138.60) | Monthly: 2,700 lbs ($594.00)
Frequently Asked Questions
How much feed does a chicken eat per day?
The amount of feed a chicken eats per day varies significantly based on the bird type, age, and purpose. Adult laying hens typically consume about one-quarter pound (4 ounces or approximately 113 grams) of feed per day, which equals roughly 1.75 pounds per week per bird. Broiler chickens raised for meat are heavier eaters, consuming up to one-third pound per day during their finishing phase, which is ages six to eight weeks. Chicks in their first few weeks eat much less, starting at about half an ounce per day and gradually increasing. Dual-purpose breeds fall between layers and broilers in consumption. Environmental factors affect feed intake as well — chickens eat more in cold weather to maintain body heat and less during extreme heat. Free-range birds with access to pasture may eat 10 to 20 percent less commercial feed due to foraging.
What type of feed should I use for different ages?
Poultry feed is formulated in phases to match the nutritional needs at each growth stage. Starter feed contains the highest protein level, typically 20 to 24 percent, and is fed to chicks from hatch to about six to eight weeks. It often comes in crumble form for easy consumption by small beaks. Grower feed contains 16 to 18 percent protein and is fed from approximately eight to eighteen weeks, supporting steady growth without the excess protein that can cause kidney issues. Layer feed contains 16 percent protein with added calcium, typically 3.5 to 4 percent, for strong eggshell production, and is fed once birds begin laying at around 18 to 20 weeks. Broiler birds use a finisher feed with 18 to 20 percent protein from six weeks to processing. Never feed layer feed to non-laying birds as the high calcium can damage their kidneys.
How do I calculate feed cost for my flock?
To calculate feed cost, multiply the daily feed consumption per bird by the number of birds in your flock to get total daily feed needs. Then multiply by the price per pound of feed. For example, 25 laying hens eating 0.25 pounds per day each equals 6.25 pounds daily total. At a feed price of 0.30 dollars per pound, daily cost is 1.88 dollars, weekly cost is 13.13 dollars, and monthly cost is approximately 56.25 dollars. To calculate cost per dozen eggs, divide your monthly feed cost by monthly egg production. For 25 hens at 75 percent lay rate, monthly production is about 47 dozen, making the feed cost per dozen approximately 1.20 dollars. Always factor in seasonal variations as feed prices fluctuate throughout the year, and remember that bulk purchasing in larger bags typically reduces per-pound costs by 15 to 25 percent.
How can I reduce feed waste and costs?
Feed waste is one of the biggest controllable expenses in poultry production, with some estimates suggesting up to 30 percent of feed can be wasted with poor management. Use properly designed feeders that minimize billing out, where chickens flick feed with their beaks. Trough feeders should be filled only two-thirds full to prevent spillage. Hanging tube feeders set at the height of the birds' backs reduce waste significantly compared to ground-level feeders. Store feed in sealed containers to prevent moisture damage, mold growth, and rodent contamination. Consider fermenting or sprouting grains, which can reduce feed consumption by 10 to 15 percent while improving nutrient absorption. Allow free-ranging when possible, as birds will supplement their diet with insects, seeds, and greens. Feeding at consistent times twice daily rather than free-choice feeding can also reduce waste and improve feed conversion.
What is feed conversion ratio and why does it matter?
Feed Conversion Ratio (FCR) measures the efficiency with which animals convert feed into body weight or eggs. It is calculated by dividing the total feed consumed by the weight gained (for meat birds) or by eggs produced (for layers). For modern broiler chickens, a typical FCR is 1.6 to 2.0, meaning the bird eats 1.6 to 2.0 pounds of feed for every pound of body weight gained. For layers, FCR is typically expressed per dozen eggs, with efficient flocks achieving 3.5 to 4.0 pounds of feed per dozen eggs. A lower FCR indicates better efficiency and lower production costs. Factors affecting FCR include genetics, feed quality, water availability, temperature, disease, and stress levels. Monitoring FCR helps identify problems early — a sudden increase in FCR often indicates a health issue, feed quality problem, or environmental stressor that needs attention.
Why might my result differ from another tool or reference?
Differences typically arise from rounding conventions, the specific version of a formula (for example, simple vs compound interest), or unit inconsistencies between inputs. Check that both tools are using the same formula variant and the same units. The References section links to the authoritative source behind the formula used here.
References
Reviewed by Daniel Agrici, Founder & Lead Developer · Editorial policy