Broiler Growth Rate Calculator

Work out broiler growth rate instantly with clear inputs, formula shown and shareable results.

About Broiler Growth Rate Calculator

Average daily gain is total gain divided by age. Feed conversion ratio is feed consumed per unit of gain and is the main cost driver. The performance efficiency factor combines weight, age and FCR into a single index — around 300 is average and above 400 is very good for modern broilers.

Formulas

Growth rate

ADG = (final weight - chick weight) / age in days

Efficiency

FCR = feed consumed / weight gain; PEF = live weight (kg) x 100 / (FCR x age) x 100

Worked example

With the default values below, Broiler Growth Rate Calculator returns Average Daily Gain of 51.38. Change any input above and every figure here is recalculated in your browser.

Inputs used

Day-Old Chick Weightminimum 1 g: 42 g
Final Live Weightminimum 1 g: 2,200 g
Age At Depletionminimum 1 days: 42 days
Feed Consumed Per Birdminimum 0 g: 3,500 g

Results

Average Daily Gain: 51.38
Total Weight Gain: 2,158.0
Feed Conversion Ratio: 1.622
Performance Efficiency Index: 323.0

Step by step

1Values used
2Growth rate
3Efficiency
4Average Daily Gain= 51.38
5Total Weight Gain= 2,158.0
6Feed Conversion Ratio= 1.622
7Performance Efficiency Index= 323.0

Assumptions and limits

The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax or compounding frequency into account.
Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

Should FCR be calculated on gain or on final weight?

Technically on gain, but the industry commonly divides feed by final live weight, which gives a slightly lower number. Be consistent when benchmarking.

Why does FCR worsen with age?

Maintenance energy rises with body weight while growth rate slows, so each extra day costs more feed per gram gained. This is why market weight and FCR trade off against each other.