Biology & Life Science

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Feed Conversion Ratio Calculator.

Calculate feed conversion ratio from feed consumed and live-weight gain.

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Feed conversion ratio: 2.5

Feed conversion ratio

2.5000

Educational arithmetic only. Enter measured values and keep units consistent. No crop, feed, veterinary, or experimental recommendation is inferred.

Use Cases

Livestock Feed Efficiency

Monitor and compare feed efficiency across different animals or feeding trials to optimize production costs.

Example: If a pig consumes 300 kg of feed and gains 100 kg, FCR = 3.0.

Aquaculture Management

Evaluate the efficiency of fish feed in aquaculture operations to adjust feeding strategies and reduce waste.

Example: For 500 kg of feed and 250 kg of fish weight gain, FCR = 2.0.

Frequently Asked Questions

What is feed conversion ratio (FCR)?
Feed conversion ratio (FCR) is a measure of how efficiently an animal converts feed into body weight. It is calculated by dividing the total feed consumed by the live-weight gain. A lower FCR indicates better feed efficiency.
How do I use this calculator?
Enter the total amount of feed consumed and the live-weight gain (the increase in animal weight) in the same mass units (e.g., kg, lb). The calculator will divide feed consumed by live-weight gain to give the FCR.
What units should I use?
Use any mass units for both inputs, but they must be the same (e.g., both in kilograms or both in pounds). The FCR is a ratio and has no units.

Tips & Common Mistakes

Tips

  • Ensure both inputs are in the same mass unit (e.g., kg, lb) to get an accurate FCR.
  • Use live-weight gain, not final weight, to measure the actual increase during the period.
  • Track FCR over time to identify trends and improve feed management.
  • Compare FCR values only within the same species and production system.

Common Mistakes to Avoid

  • Using different units for feed and gain (e.g., kg for feed and lb for gain) without converting.
  • Entering total final weight instead of live-weight gain, which inflates the FCR.
  • Forgetting to subtract initial weight from final weight when calculating live-weight gain.

Last updated: August 13, 2026