Broiler Feed Conversion Ratio: What FCR Means, How to Calculate
TL;DR: Feed conversion ratio (FCR) is total feed consumed divided by total live weight gained — FCR = feed (kg) ÷ weight gain (kg). A lower number means more efficient growth. Documented ranges put modern commercial broilers roughly between 1.5 and 2.0 for a full cycle, though the number for any specific flock depends on strain, health, housing, and management. Track your own feed and weight numbers rather than assuming a published range applies to your birds.
Feed is the biggest cost in raising a broiler, and feed conversion ratio (FCR) is the single number that tells you how efficiently your flock turned that cost into meat. Two flocks can eat the exact same total amount of feed and end up with very different profitability if one converted it into weight gain more efficiently than the other. This guide explains what FCR is, how to calculate it from your own records, and what actually moves the number.
For where FCR fits into the bigger picture, see the broiler raising pillar guide for the full cycle, and the broiler chicken feeding program for the feed side FCR is measuring.
What Is Feed Conversion Ratio?
Feed conversion ratio is the amount of feed a flock consumes divided by the amount of live weight it gains over the same period — a straightforward efficiency measure, not a complicated one. FCR = total feed consumed (kg) ÷ total live weight gained (kg). A lower FCR means the bird needed less feed to put on each kilogram of weight, which is why lower is always better.
Weight gained is calculated as the flock’s harvest live weight minus its starting weight as day-old chicks, not simply the final harvest weight on its own — a batch that started heavier or lighter as chicks needs that starting point subtracted out to measure the actual gain the feed produced.
How Do You Calculate FCR From Your Own Numbers?
Track two numbers across the full grow-out cycle: total feed given to the flock (every bag, across every feeding stage) and total live weight at harvest, then subtract the flock’s total starting weight as day-old chicks. Divide feed by weight gained.
Worked example (illustrative numbers, not a price or a specific flock): if a flock is given 200 kg of feed across the cycle and its live weight rises from a starting 5 kg total (as day-old chicks) to 130 kg total at harvest, the weight gained is 125 kg. FCR = 200 kg feed ÷ 125 kg gain = 1.6.
| Input | What to record |
|---|---|
| Total feed consumed | Sum of every feed bag/batch used across starter, grower, and finisher, in kg |
| Starting flock weight | Total weight of all day-old chicks at placement, in kg |
| Harvest flock weight | Total live weight of the flock at harvest, in kg |
| Weight gained | Harvest weight − starting weight |
| FCR | Total feed ÷ weight gained |
This calculation works at any scale — 10 backyard birds or a much larger flock — as long as you’re tracking feed and weight consistently. Weigh a representative sample of birds if weighing the whole flock isn’t practical, and use the average per-bird weight scaled to the flock size.
What Is a Typical FCR Range?
Documented ranges for modern commercial broilers commonly fall between roughly 1.5 and 2.0 for a full grow-out cycle, with well-managed flocks under strong conditions sometimes reaching below 1.6. These are general reference ranges drawn from broiler performance literature, not a guarantee for any specific strain, flock, or Philippine operation — actual results depend heavily on genetics, health, housing, and management, all covered below.
For comparison, growth-performance research on slower-growing strains raised outdoors reported FCR figures closer to 2.8-3.2 at a longer 81-day cycle — a useful illustration of how much genetics and production system affect efficiency, though it isn’t a Philippine-specific figure and shouldn’t be read as a claim about any particular native or free-range operation here. See broiler vs. native vs. layer for the fuller, honest comparison between bird types rather than a single efficiency number standing in for the whole decision.
What Moves FCR Up or Down?
FCR responds to genetics, health, housing, feed quality, water access, and stocking density — anything that stresses the bird or wastes feed pushes the number up (worse efficiency).
Genetics (strain) sets the ceiling for how efficient a flock can be before management even enters the picture — this is largely fixed once you’ve chosen your day-old chicks and isn’t something feeding or housing changes can fully overcome.
Health has an outsized effect. A flock fighting even a mild subclinical illness eats feed without converting it into weight gain at the normal rate, which is one reason backyard flock biosecurity and awareness of common poultry diseases matter for FCR, not just for avoiding visible sickness.
Heat stress and ventilation matter more for broilers than for most other chickens, because a bird under heat stress eats less and diverts energy to coping with heat rather than growth. See chicken coop ventilation in Philippine heat — a poorly ventilated broiler house in Philippine conditions can measurably worsen FCR through this pathway alone.
Feed quality and freshness matter because spoiled, wet, or contaminated feed either gets refused or provides less usable nutrition per kilo than fresh feed, worsening the ratio without the bird eating any less by weight.
Water access is easy to overlook but directly limits feed intake and digestion — a bird without consistent clean water eats less and converts what it does eat less efficiently.
Stocking density affects FCR through feeder access and stress; overcrowded birds compete for feeder space and experience more stress-driven inefficiency, tying back to the space guidance in chicken coop size per bird.
Why Does FCR Matter More Than Just Watching the Birds Grow?
Two flocks can look similarly grown at harvest and still have very different economics if one flock ate substantially more feed to get there — FCR is what surfaces that difference, since feed is the largest cost in a broiler cycle. Tracking your own FCR cycle over cycle is also the most useful way to tell whether a housing change, a feed switch, or a health intervention actually helped, because it gives you one comparable number instead of a subjective impression of how the birds looked.
The Honest Limits Here
The formula and the typical ranges above are standard, well-documented measures used across broiler production. What this guide can’t responsibly do is hand you a single FCR target for your specific flock, strain, climate, and feed — that number only comes from tracking your own feed and weight records over a full cycle, which is exactly what the calculation above is for. This guide does not state Philippine feed prices, day-old chick prices, or profit-per-bird figures — those move constantly and vary by region and supplier, so they’re left for you to plug into the formula with today’s actual numbers rather than a figure that would already be out of date.
See the broiler chicken feeding program for the feed side of this calculation, or the broiler raising pillar guide for the full cycle. If you’re still weighing whether a broiler is the right bird at all, broiler vs. native vs. layer covers the honest trade-offs, or browse the meat birds category for more.
Frequently Asked Questions
What does FCR mean in broiler farming?
FCR stands for feed conversion ratio — the amount of feed a flock consumes divided by the amount of live weight it gains. A lower FCR means the birds converted feed into meat more efficiently.
How do you calculate feed conversion ratio?
Divide total feed consumed (in kg) by total live weight gained (in kg) over the same period: FCR = feed consumed ÷ weight gained. Weight gained is the flock's harvest weight minus the starting day-old-chick weight.
What is a good FCR for a broiler flock?
Documented ranges for modern commercial broilers commonly fall between roughly 1.5 and 2.0 for a full grow-out cycle, with well-managed flocks sometimes reaching below 1.6. A specific target depends on strain, cycle length, and management, so treat these as reference ranges rather than a guarantee for any particular flock.
Why is a lower FCR better?
A lower FCR means less feed was needed to produce each kilogram of live weight, and since feed is the largest cost in a broiler cycle, a lower FCR directly lowers the feed cost of every kilogram you produce.
What factors affect FCR the most?
Genetics (strain), bird health, housing conditions (especially heat stress and ventilation), feed quality and freshness, water access, and stocking density all move FCR. Anything that stresses the bird or wastes feed pushes the ratio up.
Does FCR include the weight of the feathers and bones, or just meat?
FCR is calculated on total live weight, not just edible meat yield — it measures how much feed produced the whole live bird's weight gain, not the dressed or cut-up weight a buyer eventually pays for.
Can I calculate FCR for a small backyard flock?
Yes. Track total feed given to the flock (all bags, all stages) and weigh the flock (or a representative sample) at the start and at harvest — the same formula applies whether you're raising 10 birds or 10,000.