Feed Conversion Ratio in Cricket Farming: The Complete Guide
FCR (feed conversion ratio) is the single most important production metric in cricket farming. If you know your FCR, you know your feed cost per pound of output. If you can improve your FCR, you can improve your economics without changing anything else about your operation.
And yet, almost no practical documentation of FCR exists for cricket farming. No benchmark tables. No bin-level tracking guides. No explanation of what causes FCR to vary between bins, between farms, or between production cycles.
The industry average FCR for Acheta domesticus is 1.7-2.1. Best-in-class operations achieve 1.5. This guide explains what those numbers mean, how to calculate yours, and what to do if your FCR is above the benchmark.
TL;DR
- Every degree below 85°F reduces daily growth by approximately 3%.
- An FCR of 1.5 means 1.5 pounds of feed produces 1 pound.
- The difference between a 1.5 and a 2.1 FCR operation is substantial when you calculate it in actual dollars.
- Ensure your feed meets the 22-25% protein target for Acheta domesticus.
- A bin consistently running at 78°F uses measurably more feed to produce the same pound of cricket than one at 85°F.
- The optimal density for Acheta domesticus is approximately 5-8 adults per square inch of floor space.
- Harvest at 5-6 weeks post-hatch (at 85-88°F) to capture crickets at peak weight before reproductive energy expenditure begins.
2.
- Log total cricket weight harvested (in pounds)
3.
- Feed with less than 18% protein content consistently produces FCR above 2.5.
- Ensure your feed meets the 22-25% protein target for Acheta domesticus.
- This is the most common and most correctable cause of high FCR at the farm level.
Temperature
Every degree below 85°F reduces daily growth by approximately 3%.
What Is Feed Conversion Ratio?
FCR is the ratio of feed input to harvested output (by weight). It answers: how many pounds of feed does it take to produce one pound of cricket?
FCR Formula:
FCR = Total feed consumed (lbs) ÷ Total cricket weight harvested (lbs)An FCR of 2.0 means 2 pounds of feed produces 1 pound of cricket. An FCR of 1.5 means 1.5 pounds of feed produces 1 pound.
Lower FCR = better efficiency = lower feed cost per pound of output.
FCR vs Other Protein Sources
| Protein Source | Typical FCR |
|---|---|
| Beef | 6-8 |
| Pork | 2.5-4.5 |
| Chicken | 1.7-2.3 |
| Acheta domesticus (industry avg) | 1.7-2.1 |
| Acheta domesticus (best-in-class) | 1.4-1.5 |
Cricket farming compares favorably to any conventional protein production, but the range within the industry is notable. The difference between a 1.5 and a 2.1 FCR operation is substantial when you calculate it in actual dollars.
FCR Benchmarks for Cricket Farming
By Species
| Species | Industry Average FCR | Best Achievable |
|---|---|---|
| Acheta domesticus | 1.7-2.1 | 1.4-1.5 |
| Gryllus bimaculatus | 2.0-2.5 | 1.8-2.0 |
| Gryllodes sigillatus | 1.8-2.3 | 1.6-1.8 |
| Gryllus assimilis | 2.0-2.5 | 1.8-2.1 |
Acheta domesticus has the best achievable FCR of any commercially farmed cricket species, which is one of the reasons it dominates commercial production.
By Production Scale
| Scale | Typical FCR Range |
|---|---|
| Home/small (under 20 bins) | 2.2-3.0 |
| Commercial small (20-100 bins) | 1.9-2.4 |
| Commercial medium (100-500 bins) | 1.7-2.1 |
| Large commercial (500+ bins) | 1.5-1.9 |
Larger operations typically achieve better FCR for several reasons: more precise climate control, more optimized feed formulations, better bin management protocols, and dedicated production tracking. The scale relationship isn't absolute, a small farm with excellent management can beat a large farm with poor management, but the general trend is real.
By Life Stage
FCR varies within a production cycle. Pinhead and early nymph stages typically have the best FCR because most feed is going directly into growth. Late nymph and adult stages show worse FCR as maintenance metabolism increases.
| Life Stage | Typical FCR Contribution |
|---|---|
| Pinhead (days 0-7 post-hatch) | 1.2-1.5 |
| Early nymph | 1.5-1.9 |
| Mid nymph | 1.8-2.2 |
| Late nymph / Adult | 2.2-2.8 |
This stage-level FCR data is why harvest timing matters. Harvesting late nymph through early adult maximizes the proportion of the production cycle spent at better FCR.
How to Calculate FCR Per Bin
Most cricket farms know their farm-level FCR roughly. Almost none track it at the bin level. Bin-level tracking reveals which specific bins are driving your feed waste, information that's essential for meaningful improvement.
The Bin-Level FCR Formula
For each production cycle in each bin:
- Log total feed provided from hatch to harvest (in pounds)
- Log total cricket weight harvested (in pounds)
- Calculate: FCR = Feed In ÷ Cricket Out
This requires:
- A feed log for each bin (date, quantity, type)
- A harvest weight for each bin at the end of the cycle
Practical Bin Tracking
In CricketOps, bin-level FCR is calculated automatically from your feeding logs and harvest records. You enter the data; the platform does the calculation and shows you how each bin compares.
Without software, track each bin in a dedicated spreadsheet row: bin ID, hatch date, cumulative feed quantity per feeding (updated at each feeding), harvest date, and harvest weight. Calculate FCR at harvest.
What Factors Cause High FCR?
Understanding what drives FCR above benchmark is the first step to improving it.
Feed Protein Content
The primary lever. Feed with less than 18% protein content consistently produces FCR above 2.5. Ensure your feed meets the 22-25% protein target for Acheta domesticus. This is the most common and most correctable cause of high FCR at the farm level.
Temperature
Every degree below 85°F reduces daily growth by approximately 3%. Slower growth means more days at maintenance metabolism, more total feed consumed per unit of output, and higher FCR. A bin consistently running at 78°F uses measurably more feed to produce the same pound of cricket than one at 85°F.
Bin Density
Overcrowded bins (too many crickets per square foot of floor area) increase stress, cannibalism, and competition for feed access. Stressed crickets don't convert feed as efficiently. The optimal density for Acheta domesticus is approximately 5-8 adults per square inch of floor space.
Feed Waste
Uneaten feed doesn't count toward FCR but it counts toward your feed cost. If you're putting more feed in bins than crickets are consuming before the next feeding, you're paying for feed that does nothing. Feed to consumption, not to a fixed quantity.
Harvest Timing
Waiting too long to harvest measurably worsens FCR. Adults in the reproductive phase are consuming feed for egg production and mating activity, not for body mass. Harvest at 5-6 weeks post-hatch (at 85-88°F) to capture crickets at peak weight before reproductive energy expenditure begins.
Mortality
Dead crickets consumed feed but were never harvested. High mortality in a bin means your actual yield was lower than it should have been relative to feed invested, which shows up as higher FCR. Tracking mortality separately helps identify whether an FCR problem is a feed efficiency problem or a mortality problem.
Common FCR Mistakes
Measuring FCR at the farm level only: Farm-level FCR averages hide bin-level variance. The average might be 2.0, but if bins range from 1.5 to 3.0, you have a management problem that averaging conceals.
Not accounting for feed moisture: Wet feed (fresh produce, wet feed mixtures) weighs more than its dry nutritional equivalent. If you're measuring feed in by weight without accounting for moisture, your FCR calculation is inaccurate.
Including non-productive bins in the average: If a bin had notable disease or temperature issues, its FCR is an outlier that skews your farm average. Track outliers separately so you can identify the cause.
FAQ
What is a good FCR for a cricket farm?
A good FCR for Acheta domesticus is 1.7-2.1 at commercial scale. Best-in-class operations achieve 1.5. Home and small farms typically run 2.2-3.0 due to less precise environmental control and feed management. If your FCR is above 2.5 on Acheta domesticus, there's a correctable problem, usually feed protein content, temperature, or harvest timing.
How do I calculate FCR per bin on my cricket farm?
Total feed input to the bin (in pounds, from hatch to harvest) divided by total harvest weight (in pounds). Track feeding amounts each time you feed, total them at harvest, and divide. The CricketOps FCR calculator does this calculation automatically from your bin records. Manual calculation works fine for smaller operations using a per-bin spreadsheet tracking system.
What factors cause high FCR in cricket farming?
The most common causes in order of frequency: feed protein content below 22% (fix your feed formulation), temperature below 85°F (fix your climate control), late harvest timing (harvest at 5-6 weeks post-hatch, not 8-9 weeks), high feed waste (reduce feed quantities to consumption levels), and high mortality (identify the cause and fix it). Each of these has a measurable FCR impact. Address them in order, starting with feed protein content, it's the one that moves the needle most quickly.
How do moisture levels in cricket feed affect colony health?
Feed that is too dry reduces palatability and may cause crickets to rely entirely on water gel sources for hydration. Feed with excess moisture molds rapidly in the warm, humid environment of a cricket bin, and moldy feed is a significant exposure route for pathogens. The practical approach is to serve fresh wet foods (fruits, vegetables) separately from dry feed, replace wet items within 24 hours, and store dry feed in a low-humidity area.
Should gut-loading feed differ from the standard production diet?
Yes. Gut-loading targets the 24-48 hours before harvest to maximize the nutritional value transferred to the end consumer of the cricket. Gut-loading diets typically emphasize specific nutrients the buyer requires -- omega-3 fatty acids, calcium, and certain vitamins are common targets. Standard production feed is optimized for growth rate and FCR, not for enriching the nutritional profile of the finished product.
What feed management practices have the biggest impact on FCR?
Two changes consistently improve FCR more than any other: matching feed protein content to the optimal range for the target species (22-25% for Acheta domesticus), and increasing feeding frequency for pinhead-stage crickets (3 times per day versus once). After these two variables, reducing feed waste by feeding to observed consumption rather than fixed quantities is the next highest-impact adjustment.
Sources
- Food and Agriculture Organization of the United Nations (FAO) -- Edible Insects: Future Prospects for Food and Feed Security
- North American Coalition for Insect Agriculture (NACIA)
- Journal of Insects as Food and Feed (Wageningen Academic Publishers)
- American Association of Feed Control Officials (AAFCO)
- University of Georgia Cooperative Extension
The Bottom Line
FCR is where cricket farm economics live. Every 0.2 improvement in FCR is a meaningful reduction in feed cost per pound of output, and feed is 35-45% of your variable production cost.
Most farms that improve FCR do it by fixing one of three things: feed protein content, temperature management, or harvest timing. All three are within your control. Start tracking FCR per bin, identify your outliers, and address the root causes systematically. The cricket farm management guide has the tracking framework; the FCR calculator does the math.
Get Started with CricketOps
Feed management is where your production economics are won or lost. CricketOps lets you log every feed batch, track consumption and FCR by bin, and identify exactly where your feed program is performing and where it is not. Start tracking your feed inputs in CricketOps and get the data you need to improve your cost per pound of cricket produced.