Feed Conversion Ratio Calculator
Calculate Feed Conversion Ratio (FCR lbs feed / lb weight gain), feed conversion efficiency %, total live gain, and feed cost per pound of gain ($/lb gain).
Calculate Feed Conversion Ratio (FCR)
Enter total feed consumed (lbs or kg), starting animal weight, final animal weight, head count, and feed price.
Calculation Results
Calculated using livestock nutrition efficiency standards: \text{FCR} = \frac{\text{Total Feed Consumed (lbs)}}{\text{Total Live Weight Gain (lbs)}}
Quick Summary
The Feed Conversion Ratio Calculator evaluates livestock feed conversion efficiency ($\text{FCR} = \frac{\text{Total Feed}}{\text{Weight Gain}}$), feed efficiency %, total live gain, and feed cost per pound of gain ($/lb gain).
Formula Explanation
\text{Total Live Weight Gain} = (\text{Final Weight} - \text{Starting Weight}) \times \text{Head Count}
\text{Feed Conversion Ratio (FCR)} = \frac{\text{Total Feed Consumed}}{\text{Total Live Weight Gain}}
\text{Feed Efficiency \%} = \left(\frac{1}{\text{FCR}}\right) \times 100How It Works
Feed Conversion Ratio (FCR) measures the efficiency with which livestock convert feed mass into body weight gain. The Feed Conversion Ratio Calculator divides total weight of feed consumed by total live animal weight gain, benchmarking production performance for broilers, swine, aquaculture, and feedlot cattle.
Step-by-Step Worked Example
Practical Problem: A market hog grows from 50 lbs to 280 lbs market weight, consuming 644 lbs of complete feed costing $0.16/lb ($320/ton). Calculate FCR, feed efficiency %, and feed cost per pound of gain.
- Step 1: Calculate total weight gain: $280\text{ lbs} - 50\text{ lbs} = \mathbf{230\text{ lbs live gain}}$.
- Step 2: Calculate Feed Conversion Ratio (FCR): $644\text{ lbs feed} / 230\text{ lbs gain} = \mathbf{2.80\text{ FCR (2.80 : 1)}}$.
- Step 3: Calculate Feed Efficiency %: $(1 / 2.80) \times 100 = \mathbf{35.7\%\text{ feed efficiency}}$.
- Step 4: Calculate total feed cost: $644\text{ lbs} \times \$0.16 = \mathbf{\$103.04\text{ total feed cost}}$.
- Step 5: Calculate feed cost per pound of gain: $\$103.04 / 230\text{ lbs gain} = \mathbf{\$0.448\text{ feed cost per lb of gain}}$ ($\$0.45/\text{lb gain}$).
Real-World Calculation Examples
Scenario 1: Market Hog (50 lbs to 280 lbs)
Parameters: 644 lbs feed, 230 lbs gain, $0.16/lb feed
Result: 2.80 : 1 FCR (35.7% efficiency, $0.45/lb gain).
Scenario 2: Commercial Broiler Chicken
Parameters: 10.5 lbs feed, 6.0 lbs weight gain
Result: 1.75 : 1 FCR (57.1% efficiency, high poultry efficiency).
Scenario 3: Feedlot Finishing Steer
Parameters: 2,400 lbs DMI feed, 400 lbs weight gain
Result: 6.00 : 1 FCR (16.7% efficiency, ruminant fiber digestion).
Scenario 4: Farmed Tilapia / Salmon Fish
Parameters: 1.2 kg feed, 1.0 kg fish gain
Result: 1.20 : 1 FCR (83.3% efficiency, aquatic buoyancy saves energy).
Key Benefits of Using This Calculator
Universal Livestock Compatibility
Benchmarks FCR across broilers (1.6–1.8), swine (2.6–3.0), beef (5.5–6.5), and aquaculture (1.1–1.3).
Feed Efficiency Percentage
Converts FCR ratio into intuitive Feed Efficiency percentage ($1 / \text{FCR} \times 100$).
Cost of Gain Benchmark
Calculates exact feed cost per pound or kilogram of live weight gain ($/lb gain).
100% Free & Client-Side
Executes locally in your browser with zero latency or web server transmission.
Frequently Asked Questions (FAQ)
What is Feed Conversion Ratio (FCR)?
FCR is the ratio of total mass of feed consumed to total live body weight gained ($\text{FCR} = \text{Feed Mass} / \text{Weight Gain}$). Lower values indicate higher efficiency.
What is good FCR for broiler chickens?
Modern commercial broiler chickens achieve an FCR of 1.5 to 1.8 lbs of feed per 1.0 lb of gain.
What is good FCR for market pigs?
Commercial swine operations target a grower-finisher FCR of 2.6 to 2.9 lbs of feed per 1.0 lb of gain.
What is good FCR for feedlot beef cattle?
Finishing feedlot steers achieve an FCR of 5.5 to 6.5 lbs of dry matter feed per 1.0 lb of gain.
Why do fish have a much lower FCR than cattle?
Fish are cold-blooded (ectothermic) and supported by water buoyancy, expending zero energy on maintaining body temperature or standing up.
What is the difference between FCR and FE (Feed Efficiency)?
FCR is feed consumed per unit gain (e.g. 2.8). Feed Efficiency (FE) is the reciprocal expressed as percentage ($\text{FE} = 1 / 2.8 = 35.7\%$).
How does animal age affect FCR?
FCR worsens as animals mature because older animals deposit more fat (which requires 9 times more energy per pound than lean muscle tissue).
How does feed particle size affect swine FCR?
Reducing corn particle size to 600–700 microns improves pig FCR by 1% for every 100 micron reduction in particle size.
What is Residual Feed Intake (RFI)?
RFI is the difference between actual feed intake and expected feed intake based on animal body weight and growth rate. Lower RFI animals eat less feed for the same gain.
How do environmental stressors increase FCR?
Cold stress, heat stress, mud, and subclinical disease divert feed energy away from muscle growth toward body heat regulation and immune response, deteriorating FCR.