Pig Feed Conversion Calculator

Work out pig feed conversion instantly with clear inputs, formula shown and shareable results.

About Pig Feed Conversion Calculator

Feed conversion ratio is feed consumed divided by live weight gain — the single most important efficiency measure in pig production, since feed is 65-75% of the cost. Modern genetics on a well-balanced diet achieve 2.4-2.8 from 25 kg to slaughter; above 3.2 suggests diet, health or wastage problems.

Formulas

Feed conversion

FCR = feed consumed / (finish weight - start weight)

Growth rate

ADG (g/day) = gain x 1000 / days on feed

Worked example

With the default values below, Pig Feed Conversion Calculator returns Feed Conversion Ratio of 2.941. Change any input above and every figure here is recalculated in your browser.

Inputs used

Feed Consumedminimum 0 kg: 250 kg
Starting Weightminimum 0.1 kg: 25 kg
Finishing Weightminimum 0.1 kg: 110 kg
Days On Feedminimum 1 days: 110 days

Results

Feed Conversion Ratio: 2.941
Average Daily Gain: 772.7
Total Weight Gain: 85.00
Average Daily Feed Intake: 2.273

Step by step

1Values used
2Feed conversion
3Growth rate
4Feed Conversion Ratio= 2.941
5Average Daily Gain= 772.7
6Total Weight Gain= 85.00
7Average Daily Feed Intake= 2.273

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

Why does FCR worsen towards slaughter weight?

Maintenance requirement rises with body weight and later gain contains more fat, which costs more energy per kilogram than lean. Extending finishing weight always worsens FCR.

Is spilled feed counted?

Yes — FCR measured from feed delivered includes wastage, which can be 5-10% with badly adjusted feeders. That is exactly why the measured figure is the one that matters commercially.