Feed Conversion Ratio Calculator
Calculate Feed Conversion Ratio (FCR) for any livestock species. Enter feed consumed and weight gained to get FCR, industry benchmark comparison, and feed cost per pound of gain.
Feed Conversion Ratio Calculator Tool
Why use this free feed conversion ratio calculator?
Built with the features most competitors miss — from benchmark comparisons to multi-method inputs and actionable guidance.
How to use this feed conversion ratio calculator
FCR benchmarks by species
| Species | Benchmark FCR | Performance notes |
|---|---|---|
| Salmon / Trout | 1.2 to 1.5 | Best FCR of any farmed species |
| Broiler chicken | 1.7 to 2.0 | 6-week grow-out; intensively selected |
| Pig (finishing) | 2.5 to 3.2 | Corn-soy diet; market weight |
| Turkey (tom) | 2.5 to 3.0 | 16 to 18 week grow-out |
| Rabbits (fryer) | 3.0 to 4.5 | Commercial production |
| Sheep (lamb finishing) | 5.0 to 7.0 | Higher than monogastrics |
| Beef cattle (feedlot) | 6.0 to 7.5 | Grain-based; grass-fed FCR higher at 8 to 12 |
| Dairy (lbs milk/lb feed) | 1.3 to 1.8 | Different metric from meat animals |
How this calculator compares
LazyTools fills the gaps most competing tools leave open — deeper analysis, benchmark context, and actionable guidance alongside the core calculation.
| Feature | LazyTools | OmniCalculator | AgriKing | FarmProgress.com |
|---|---|---|---|---|
| FCR calculation | ✓ Yes | ✓ | ✓ | Partial |
| Species benchmark comparison | ✓ Yes | ✗ | ✗ | ✗ |
| Performance rating | ✓ Yes | ✗ | ✗ | ✗ |
| Cost per pound of gain | ✓ Yes | ✗ | Partial | ✗ |
| Start/end weight input | ✓ Yes | ✗ | ✗ | ✗ |
| 11 species supported | ✓ Yes | ✗ | ✗ | ✗ |
Feed Conversion Ratio Calculator: Complete Guide
Feed conversion ratio is one of the most economically important metrics in livestock production. Because feed costs represent 60 to 75% of total variable production costs, small FCR improvements translate directly into significant profitability gains.
What FCR means and why it matters
FCR measures how efficiently an animal converts feed into body weight. An FCR of 2.0 means 2 lbs of feed produces 1 lb of live weight gain. An FCR of 7.0 means 7 lbs per lb of gain. Because feed is the largest production cost, FCR is directly linked to profitability. Improving broiler FCR from 2.0 to 1.8 reduces feed cost per bird by 10% — on a 50,000-bird house, that is significant money per flock.
FCR by species: a comparative view
FCR varies dramatically across species. Fish are most efficient (1.2 to 1.8), followed by poultry (1.7 to 2.0 for broilers), pigs (2.5 to 3.5), and ruminants (beef cattle 6 to 8, sheep 5 to 7). Ruminants appear less efficient on a body weight basis, but they uniquely convert forages inedible to humans into high-quality protein, which significantly changes the sustainability picture.
Factors that affect FCR
Genetics: modern commercial breeds convert feed 40 to 50% more efficiently than their 1950s counterparts. Diet: energy and protein levels, amino acid balance, digestibility, and feed form (pellet vs mash) all affect FCR. Health: sick animals divert metabolic energy to immune function rather than growth, worsening FCR significantly. Disease is often the largest driver of FCR variation within an operation. Environment: thermal comfort and appropriate stocking density affect FCR through energy expenditure and stress hormone levels.
Converting FCR to economics: cost of gain
Feed cost per lb gain = FCR x Feed cost per lb. At $320/ton ($0.16/lb) and FCR 7.0: Feed cost = 7.0 x $0.16 = $1.12/lb gain. Total cost of gain (TCOG) adds yardage (approximately $0.35 to $0.50/head/day), health costs, and interest on feeder animal investment. Understanding TCOG relative to expected sale price determines breakeven and profitability at any given feeding margin.
Measuring FCR accurately on farm
Accurate FCR measurement requires calibrated feed scales (not estimates), accurate animal weights at consistent time of day and gut fill, consistent measurement periods (30 days minimum), and accounting for mortality (dead animals consumed feed but gained no weight). Pen-level FCR is easier than individual FCR but masks individual variation useful in genetic selection programmes.