Feed Conversion Ratio Calculator

Frequently Asked Questions

What is a good feed conversion ratio?

Lower FCR is better because it means less feed per unit of weight gain. Broiler chickens achieve 1.6-2.0, pigs 2.5-3.5, and beef cattle 5.0-8.0. Salmon and trout are the most efficient at 1.0-1.3 because fish are cold-blooded and do not burn energy for thermoregulation.

How can I improve my FCR?

Feed quality, feed freshness, animal health, stocking density, and water access all affect FCR. Reducing feed waste through proper feeder design, maintaining optimal temperature for the species, and minimizing stress also improve conversion efficiency.

Is FCR the same as feed efficiency?

FCR and feed efficiency are reciprocals. FCR = feed consumed / weight gained (lower is better). Feed efficiency = weight gained / feed consumed (higher is better). Most livestock producers use FCR because the numbers are more intuitive for benchmarking.

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Estimates for informational purposes only.

Important Disclaimer: Estimates for informational purposes only.

This calculator provides estimates for informational purposes only. Results are based on assumptions and may not reflect actual outcomes. Consult qualified professionals in relevant fields before making important decisions based on these results.

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How This Calculator Works

Feed conversion ratio (FCR) is the single most important efficiency metric in animal production. It measures how many kilograms of feed are required to produce one kilogram of live weight gain. A broiler chicken that eats 3.2 kg of feed to grow 2 kg has an FCR of 1.6. A beef steer that eats 700 kg of feed to gain 100 kg has an FCR of 7.0. The lower the number, the more efficiently the animal is converting feed into body mass.

This calculator computes FCR from total feed consumed and total weight gain. If you provide a feed cost per kilogram, it calculates the feed cost per kilogram of gain, which is a direct input to profitability analysis. If you provide the animal's current weight, target weight, and average daily feed intake, the calculator projects how much additional feed will be needed and how many days remain until the target weight is reached.

What is a Good FCR?

FCR benchmarks vary widely by species and production system. Use these ranges as a guide when interpreting your results:

Salmon and trout: 1.0-1.3 (aquaculture's most efficient converters)

Broiler chickens: 1.6-2.0 (modern genetics and feed formulation push toward 1.6)

Dairy cows: 1.4-1.6 (measured as feed dry matter per kg of energy-corrected milk)

Pigs (wean to finish): 2.5-3.5

Beef cattle (feedlot): 5.0-8.0 (ruminant physiology makes cattle inherently less efficient than monogastrics)

Within a species, FCR varies by genetics, diet quality, health status, housing environment, and age. Young, fast-growing animals typically have better FCR than older ones nearing market weight because a greater proportion of feed goes to muscle rather than maintenance.

Worked Example

A group of 100 broilers consumed 320 kg of feed over a 5-week grow-out and gained a total of 200 kg. FCR = 320 / 200 = 1.60. Feed costs $0.45 per kg, so feed cost per kg of gain = 1.60 x $0.45 = $0.72 per kg. The birds currently weigh 1.8 kg average and the target is 2.2 kg. Remaining gain = 0.4 kg per bird, or 40 kg for the group. Feed needed = 40 x 1.60 = 64 kg. Average daily intake for the group is 4.5 kg, so days to target = 64 / 4.5 = 14 days.

Tips and FAQ

Should I use live weight or carcass weight? FCR is almost always expressed on a live weight basis unless specifically stated otherwise. Carcass-based FCR (also called "dressed weight FCR") will always be higher because the carcass is a fraction of the live weight.

Does water intake affect FCR? No. FCR counts only solid or pelleted feed. Water consumption is tracked separately because it does not contribute to body mass in the same direct way.

What drives high FCR? Poor diet formulation, disease, parasites, temperature stress, feed wastage, overcrowding, and suboptimal genetics all raise FCR. Addressing these factors one at a time is the most systematic way to improve production efficiency.

Can FCR be below 1.0? In aquaculture, FCR can approach but not fall below 1.0 because fish retain water and minerals that inflate the apparent gain relative to dry feed inputs. Values below 1.0 are occasionally reported for fish fed wet or moist diets but are not meaningful on a dry-matter basis.

Feed Conversion Ratio Calculator

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