Calculate swine feed conversion ratio (FCR) for nursery, grower, and finisher pigs. Track feed efficiency and cost per pound of gain for hog production.
The Swine Feed Conversion Calculator determines the feed conversion ratio (FCR) — pounds of feed consumed per pound of body weight gained — for nursery, grower, and finisher pigs. FCR is the most critical efficiency metric in swine production, directly affecting feed cost per pound of pork produced.
Swine FCR varies dramatically by production phase. Nursery pigs (12-50 lbs) convert at 1.3-1.6:1 due to rapid lean muscle growth. Grower pigs (50-150 lbs) convert at 2.0-2.5:1. Finisher pigs (150-280 lbs) convert at 2.8-3.2:1 as fat deposition increases. Overall wean-to-finish FCR for modern genetics is typically 2.5-2.8:1.
Tracking FCR by phase helps identify where feed is being used efficiently and where improvements are possible. Feed represents 65-70% of total pork production cost, so even small improvements in FCR translate to significant economic savings across a large operation. Whether you are a beginner or experienced professional, this free online tool provides instant, reliable results without manual computation.
Feed is the largest cost in pork production. Monitoring FCR by phase reveals inefficiencies in nutrition, health, or management. A 0.05 improvement in wean-to-finish FCR saves over $1/pig — substantial when multiplied across thousands of pigs. Having a precise figure at your fingertips empowers better planning and more confident decisions.
FCR = Total feed consumed (lbs) / Total weight gained (lbs) Total gain = End weight − Start weight Benchmark FCR by phase: - Nursery (12–50 lbs): 1.3–1.6 - Grower (50–150 lbs): 2.0–2.5 - Finisher (150–280 lbs): 2.8–3.2 - Wean to finish: 2.5–2.8
Result: FCR = 2.96
Total gain = 280 − 50 = 230 lbs. FCR = 680 / 230 = 2.96:1. This is average grow-finish performance. At $0.12/lb feed cost, feed cost per pound of gain = 2.96 × $0.12 = $0.355/lb.
Swine nutritionists formulate different diets for each growth phase because nutrient requirements change as pigs grow. Young pigs need high-protein, energy-dense diets. Finishing pigs need less protein relative to energy. Using the right diet at the right time minimizes feed cost per pound of gain.
Genetic selection has improved swine FCR by approximately 0.02 points per year over the past two decades. Modern lean genotypes convert feed significantly more efficiently than older genetics. Choosing genetics with strong feed efficiency data pays for itself in reduced feed cost.
Temperature dramatically affects swine FCR. Below the thermoneutral zone (60-75°F for finishing pigs), pigs eat more to generate body heat, worsening FCR. Above it, feed intake drops and growth slows. Maintaining proper ventilation and temperature control is essential for optimal FCR.
Top-performing operations achieve 2.5-2.6:1 wean-to-finish FCR with modern genetics. Average performance is 2.7-2.9:1. FCR above 3.0:1 indicates significant room for improvement in genetics, nutrition, health, or management.
Heavier pigs have higher maintenance requirements relative to gain, and fat deposition (which requires more energy per pound than lean tissue) increases as pigs approach market weight. Both factors increase FCR in the finisher phase.
Pelleting improves FCR by 5-8% by reducing feed waste and improving nutrient digestibility. The expense of pelleting is almost always justified economically. Fine grinding also improves FCR but can increase the risk of gastric ulcers.
Disease diverts nutrients from growth to immune response and tissue repair. PRRS alone can worsen FCR by 0.2-0.5 points. Maintaining high health status through biosecurity, vaccination, and disease elimination is one of the most effective ways to improve FCR.
Feed cost of gain = FCR × feed price per pound. At FCR 2.8:1 and $0.12/lb feed, cost of gain = $0.336/lb. This is the feed-only cost to add one pound of body weight.
Yes. Dead pigs consumed feed but produced no marketable weight. Include all feed delivered to the barn and divide by total live weight sold. This gives a more accurate economic FCR that reflects mortality impact.