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BSF metrics series
Most BSF business plans I review start with the same numbers: "50–85% waste conversion," "harvest at day 14," "any organic waste works." Those numbers are everywhere — and most of them are misleading once you run a real facility on real waste with real workers.
01 · The series
Seven metrics that actually matter
Next week I'm starting a 7-post series: BSF Metrics That Actually Matter. One post per week. One metric per post. Myth, real number, what to do about it — grounded in 8+ years of production across 50+ customers on 6 continents.
Short version of what's coming:
- #1 — Bioconversion Ratio. "50–85% conversion" is waste reduction, not usable output. Real potential indoor BCR: 14–18%. Outdoor tropical: 3–10%.
- #2 — Rearing cycle length. "Harvest at day 14" costs 44% of your throughput. Target 8 days. Above 10, something is wrong. Same for larvae size: should get >150mg, below 100mg something is wrong.
- #3 — Substrate moisture. A 5% moisture shift is the difference between an 8-day and a 14-day cycle. Most small farms never control it. Keeping substrate moisture maximal is not an option, it is a must.
- #4 — Temperature. Climate-controlled facilities outperform open-air by 3–10×. Same biology, same waste. Temperature and humidity stability and control is the reason.
- #5 — Substrate quality and FCR. "Any organic waste works" isn't true. And most microbial "BSF boosters" have no peer-reviewed effect on nutrient-rich food waste. You need to evaluate business case for each substrate separately. There are no generic business metrics for BSF production.
- #6 — Larval density and survival. More larvae per tray ≠ more output per tray. The curve peaks, then drops. Overcrowding is the quiet killer as well as too little. Making profit requires to know how to count and dose larvae correctly.
- #7 — Dried product yield. 5 tons of waste → ~250 kg of dried product. That's 5%, not 50%. This is the number your business plan should start with, and why finding zero cost substrates is critical.
02 · Who it is for
For people running or starting BSF operations
Aimed at people actually running or starting BSF operations. If you want the numbers behind what works in a real facility — not a pitch deck — follow along.
M1 drops Tuesday.
Keep exploring
Related topics and pages
- Key production output metrics in BSF farming: Measuring efficiency and ROI — the metric-by-metric guide this series previews
- Production capacity in BSF farming: Realistic output metrics that actually hold — the capacity numbers that still hold after six months of operation
- Optimizing BSF production: The role of temperature and humidity control — the temperature and humidity behaviour behind the temperature metric
Read next
- Key production output metrics in BSF farming: Measuring efficiency and ROI — the metric-by-metric guide this series previews
- Production capacity in BSF farming: Realistic output metrics that actually hold — the capacity numbers that still hold after six months of operation
- Feedstock management in BSF production: Controlling variability instead of chasing cheap inputs — the feedstock variability behind substrate quality and FCR
- Four Ways to Handle Biowaste — Where Each One Actually Wins — the treatment-route comparison built on the same per-case evaluation rule
Next step
Check the numbers on a real case
Manna can help test which BSF metrics hold for a specific material, site and operating team.