Feed Conversion Ratio Calculator

Calculate the feed conversion ratio (FCR) for your livestock. Measure feed efficiency for meat, egg, and milk production, estimate feed costs, and analyze economic and technical FCR.

Last updated: June 20, 2026
Frank Zhao - Creator
CreatorFrank Zhao

Feed conversion ratio (FCR)

Feed cost

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1Feed Conversion Ratio (FCR)
FCR=Total feed consumedTotal weight of product producedFCR = \frac{\text{Total feed consumed}}{\text{Total weight of product produced}}
2Weight Gain
Weight gain=Final weight−Initial weight\text{Weight gain} = \text{Final weight} - \text{Initial weight}
3FCR (per dozen eggs)
FCR (per dozen)=Total feed×12Number of eggs\text{FCR (per dozen)} = \frac{\text{Total feed} \times 12}{\text{Number of eggs}}
4Total Feed Cost
Total cost=Cost per unit weight×Weight bought\text{Total cost} = \text{Cost per unit weight} \times \text{Weight bought}
5Economic FCR
Economic FCR=Total feed consumedTotal weight of slaughtered animals\text{Economic FCR} = \frac{\text{Total feed consumed}}{\text{Total weight of slaughtered animals}}
6Technical FCR
Technical FCR=Total feed consumedNumber of animals that left the farm\text{Technical FCR} = \frac{\text{Total feed consumed}}{\text{Number of animals that left the farm}}
FCRFCRFeed conversion ratio
FFTotal feed consumed
WgW_gWeight gain
NeN_eNumber of eggs

Introduction / overview

Raising animals for food comes down to a deceptively simple question: how much feed does it take to produce a kilogram of meat, a liter of milk, or a dozen eggs? The Feed Conversion Ratio — or FCR — answers exactly that.

In its simplest form, FCR is the amount of feed an animal eats divided by the output it produces. A chicken that eats 1.8 kg1.8\ \text{kg} of feed to gain 1 kg1\ \text{kg} of body weight has an FCR of 1.81.8. The lower the number, the more efficient the animal. That efficiency translates directly into lower feed costs and higher profit margins.

This calculator goes beyond the basic FCR — it also computes feed cost, Economic FCR (which accounts for slaughterhouse yield), and Technical FCR (which includes mortality). You can switch between meat, egg, and milk production to get the metrics that matter for your operation.

Who is this for?

  • Farmers & ranchers who want to compare feed efficiency across batches or suppliers.
  • Feed manufacturers evaluating the performance of their rations.
  • Students & researchers in animal science or agricultural economics.
  • Hobbyists raising backyard poultry, rabbits, or fish who want to optimize their feeding program.

If you are also tracking mortality, try our Animal Mortality Rate Calculator — the Technical FCR section in this tool already works hand-in-hand with mortality data.

How to use / quick start

Using the calculator takes just a few steps. Here is a step-by-step walkthrough for a broiler chicken batch.

1

Choose your product type

Select Meat, Egg, or Milk — the calculator shows the relevant fields automatically.

2

Enter feed consumed

Type the total weight of feed your animals ate during the growing period. You can switch between kilograms, pounds, tons, and more.

3

Enter animal weights (meat mode)

Fill in the initial and final weights. The calculator will compute the weight gain and the FCR automatically.

4

Read your results

The FCR appears in blue — a lower number means better feed efficiency. The Feed cost section lets you estimate expenses.

5

Explore advanced metrics

Open the Economic FCR and Technical FCR sections for deeper analysis.

Example calculation

Suppose you raised a batch of broiler chickens and recorded:

  • Total feed consumed: 1800 kg1800\ \text{kg}
  • Total weight gain: 1000 kg1000\ \text{kg}

The FCR is:

FCR=18001000=1.8\text{FCR} = \frac{1800}{1000} = 1.8

An FCR of 1.81.8 is excellent for broilers — it means each kilogram of chicken required only 1.8 kg1.8\ \text{kg} of feed.

If you want to estimate feed costs for the next batch, the Feed cost section of this calculator lets you enter your feed price per kilogram and see the total expense. For a full profitability analysis, pair this with our Animal Mortality Rate Calculator.

Real-world examples

Example 1: Comparing two chicken feeds

Broiler poultry feed selection

A farmer trials two feeds on separate batches of broiler chicks.

  • Feed A (24% protein): chicks eat 2.5 kg2.5\ \text{kg} per 1 kg1\ \text{kg} gain → FCR = 2.52.5
  • Feed B (34% protein): chicks eat 1.8 kg1.8\ \text{kg} per 1 kg1\ \text{kg} gain → FCR = 1.81.8

What it means: Feed B is more efficient. Even if Feed B costs more per kilogram (due to higher protein), the lower FCR means you buy less feed overall. Use the Feed cost section of this calculator to compare total feed expense for your target production volume.

Example 2: Fish farming — budget planning

Pangasius catfish pond management

A fish farmer has a budget of $15 000\$15\,000 for feed. Feed costs $300\$300 per metric ton. Last season the FCR was 2.252.25. How many kilograms of catfish can the farmer expect to produce?

Feed purchased=15000300=50 tons=110 231 lbs\text{Feed purchased} = \frac{15000}{300} = 50\ \text{tons} = 110\,231\ \text{lbs}
Fish produced=110 2312.25≈48 992 lbs\text{Fish produced} = \frac{110\,231}{2.25} \approx 48\,992\ \text{lbs}

With a $15 000\$15\,000 feed budget, the farmer can expect roughly 48 99248\,992 pounds of market-ready fish — enough to plan sales, storage, and transport well in advance.

Example 3: Layer flock — eggs as output

Egg production efficiency

A layer farm feeds its hens 500 kg500\ \text{kg} of feed and collects 8 0008\,000 eggs. The calculator shows:

  • FCR (eggs)=500/egg weight\text{FCR (eggs)} = 500 / \text{egg weight} — based on the weight of eggs produced
  • FCR (per dozen)=(500×12)/8000=0.75\text{FCR (per dozen)} = (500 \times 12) / 8000 = 0.75 — less than 1 kg of feed per dozen! Highly efficient.

This tells the farmer the flock is performing well. If the FCR starts creeping up, it may signal feed quality issues, health problems, or environmental stress.

Common scenarios

Comparing feed suppliers

Run the same batch data with each feed to see which supplier gives the lowest FCR.

Budgeting next season

Use the Feed cost section to estimate total feed expense for a target production volume, then adjust your budget accordingly.

Batch-to-batch tracking

Record FCR for every batch. A rising trend may indicate degrading feed quality or emerging health issues.

Troubleshooting poor performance

When FCR spikes, check feed wastage, diet formulation, stocking density, and animal health. The Economic FCR reveals true slaughter yield.

Sustainability reporting

Lower FCR means less feed, less land, and lower carbon footprint per kilogram of animal protein. Use FCR data for environmental audits.

Dairy herd evaluation

Switch to Milk mode and track FCR per liter of milk. Compare different cow breeds or feeding regimens to optimize dairy output.

Tips & best practices

Weigh feed accurately

The FCR is only as good as your data. Use a scale — don't estimate. Even a 5% error in feed weight creates a misleading FCR.

Account for mortality

Dead animals consumed feed too. Use the Technical FCR section, which includes all animals that left the farm, to get a realistic picture.

Use consistent units

The calculator handles unit conversion automatically, but make sure you are comparing like with like when evaluating two batches.

Don't cherry-pick

A single batch FCR is noisy. Track 5-10 consecutive batches before making feed or management changes.

Pro tip: Use the Economic FCR section together with the basic FCR. If your basic FCR looks good but your Economic FCR is poor, you may be losing too much yield at slaughter — a problem that basic FCR completely misses.

Calculation method

Basic FCR formula

FCR=Total feed consumedTotal weight of product produced\text{FCR} = \frac{\text{Total feed consumed}}{\text{Total weight of product produced}}

For meat animals, Total product=Final weight−Initial weight\text{Total product} = \text{Final weight} - \text{Initial weight}, so:

FCR=Total feed consumedFinal weight−Initial weight\text{FCR} = \frac{\text{Total feed consumed}}{\text{Final weight} - \text{Initial weight}}

Feed cost

Total feed cost=Cost per unit weight×Weight of feed bought\text{Total feed cost} = \text{Cost per unit weight} \times \text{Weight of feed bought}

Economic FCR

Economic FCR accounts for slaughter yield by removing by-products (feathers, hide, blood, etc.):

Economic FCR=Total feed consumedTotal weight of slaughtered animals\text{Economic FCR} = \frac{\text{Total feed consumed}}{\text{Total weight of slaughtered animals}}

Where Slaughtered weight=Live weight−By-products\text{Slaughtered weight} = \text{Live weight} - \text{By-products}.

Technical FCR

Technical FCR includes animals lost to mortality — it reflects the farm's overall productivity:

Technical FCR=Total feed consumedNumber of animals that left the farm\text{Technical FCR} = \frac{\text{Total feed consumed}}{\text{Number of animals that left the farm}}

FCR per dozen eggs

FCR (per dozen)=Total feed×12Number of eggs produced\text{FCR (per dozen)} = \frac{\text{Total feed} \times 12}{\text{Number of eggs produced}}

Expected return

The expected meat, milk, or egg yield from a given amount of feed at a known FCR:

Expected return=Weight of feed boughtFCR\text{Expected return} = \frac{\text{Weight of feed bought}}{\text{FCR}}

Variable definitions

FF

Total feed consumed (kg)

WpW_p

Weight of product (meat, milk, eggs)

WiW_i

Initial animal weight

WfW_f

Final animal weight

CfC_f

Cost of feed per unit weight

CtC_t

Total cost of feed

Related concepts

Why FCR matters for profitability

Feed typically accounts for 60-70% of total production costs in animal agriculture. Every 0.1 improvement in FCR translates to substantial savings. For a broiler farm producing 100 000 kg100\,000\ \text{kg} of chicken, dropping FCR from 1.81.8 to 1.71.7 saves roughly 10 000 kg10\,000\ \text{kg} of feed — which can be thousands of dollars per cycle.

Typical FCR values by species

Different animals convert feed with very different efficiencies. Here is a quick reference:

Fish (salmon, tilapia)1.2 – 1.8
Broiler chickens1.5 – 2.0
Pigs3.0 – 3.9
Rabbits3.5 – 5.0
Sheep & goats (concentrate)4.5 – 5.5
Beef cattle8.0 – 12.0

Frequently asked questions

What does FCR stand for?

FCR stands for Feed Conversion Ratio. It measures how many units of feed an animal needs to produce one unit of output (meat, milk, or eggs).

Is a higher or lower FCR better?

Lower is better. An FCR of means the animal needs of feed per of gain; an FCR of means it needs . Less feed for the same output = more efficient.

What is a good FCR for broiler chickens?

Modern broiler strains typically achieve an FCR of to under good management. Values above suggest there is room for improvement in feed quality, health, or housing conditions.

Can FCR be less than 1?

Yes — especially in fish farming. When the moisture content of the feed is lower than the moisture content of the animal tissue, the FCR can drop below 1. For example, if of dry feed produces of fish (which is mostly water), the FCR is .

Why does my Economic FCR differ from my basic FCR?

The basic FCR uses the animal's live weight gain, while the Economic FCR uses the slaughter weight (live weight minus by-products). If your Economic FCR is significantly worse, it means a large portion of the animal is being lost as non-edible parts — which could indicate poor dressing percentage or excessive trimming at the slaughterhouse.

How do I calculate FCR for dairy cattle?

Switch this calculator to Milk mode. The formula becomes: . You can enter milk volume in liters or gallons, and the calculator handles the conversion.

Should I track FCR for each animal individually or for the whole flock?

Flock-level FCR is more practical for most operations. Individual FCR requires weighing each animal, which is time-consuming. However, if you have the infrastructure (e.g., electronic feeders with weigh scales), individual FCR data can help identify low-performing animals for culling.

Does feed wastage affect FCR?

Absolutely. If you calculate FCR using feed delivered rather than feed consumed, wastage will inflate the FCR and make a good feed look bad. Use feeders that minimize spillage, and if possible, measure leftover feed at the end of each batch.

Limitations

  • FCR does not measure feed quality — two feeds with the same FCR may have different nutritional profiles, which affects animal health and meat quality.
  • FCR varies by genetics — some breeds or strains are naturally more efficient. Comparing FCR across different genetic lines without controlling for this can be misleading.
  • Environmental factors like temperature, humidity, and stocking density all influence FCR. Always compare batches raised under similar conditions.
  • This calculator provides estimates only — it is a decision-support tool, not a substitute for professional agricultural advice or controlled feeding trials.

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Feed Conversion Ratio Calculator | FCR Calculator