Estimate growth yield using biomass and substrate inputs. Compare gross and net conversion performance clearly. Download tables, reports, and graphs for fast bioprocess review.
Enter concentrations in g/L, time in hours, and reactor volume in liters.
| Variable | Example Value | Unit |
|---|---|---|
| Initial Biomass | 0.40 | g/L |
| Final Biomass | 3.20 | g/L |
| Initial Substrate | 18.00 | g/L |
| Final Substrate | 4.50 | g/L |
| Fed Substrate Added | 2.00 | g/L |
| Maintenance Loss | 0.60 | g/L |
| Elapsed Time | 10.00 | h |
| Reactor Volume | 5.00 | L |
| Gross Biomass Yield | 0.1806 | g/g |
Core biomass yield coefficient:
Yx/s = ΔX / ΔS
Where:
Additional process metrics:
This layout supports batch and simple fed-batch reviews. It also helps compare observed growth against a target process expectation.
The biomass yield coefficient shows how efficiently cells convert substrate into new biomass. It is one of the most useful fermentation performance indicators. A higher value often means better carbon utilization. A lower value can signal stress, maintenance burden, oxygen limits, or measurement error.
This calculator goes beyond a basic Yx/s equation. It estimates gross yield, net yield, productivity, specific growth rate, substrate conversion, product yield relationships, and theoretical efficiency. That makes it useful for early screening, batch review, and routine process monitoring. It also helps compare runs made at different scales.
Gross yield uses the full substrate consumption value. Net yield removes maintenance demand. When the gap between gross and net yield is large, cells may be spending more substrate on survival than growth. Specific growth rate helps show how fast biomass increased during the measured interval. Productivity shows how much adjusted biomass was formed per hour.
Check that biomass and substrate units match. Confirm whether data are on wet basis or dry basis. Review whether feed additions were included. Make sure the elapsed time reflects the same sampling window used for concentrations. If the observed yield exceeds the theoretical limit, inspect assay calibration, dilution factors, and sample timing.
Use it for microbial growth studies, fed-batch reviews, bench bioreactor work, educational exercises, and process transfer checks. The result table, CSV export, PDF export, and Plotly chart make it suitable for quick reporting without extra formatting work.
It is the ratio of biomass formed to substrate consumed. It shows how effectively a culture converts feed into new cell mass during the selected process interval.
Gross yield uses total substrate consumed. Net yield subtracts maintenance demand. Comparing both values helps separate growth-related conversion from substrate used for cellular upkeep.
It adjusts measured biomass when readings need conversion to a dry mass basis. This is helpful when wet biomass, slurry mass, or indirect assays are used.
Yes. Enter substrate added during feeding in the fed substrate field. The calculator includes it when estimating total substrate available and consumed.
A negative yield usually means biomass decreased, substrate data are inconsistent, or the measurement window does not match the same run phase. Recheck units and sampling times.
There is no single universal value. It depends on organism, medium, oxygen transfer, and operating conditions. Compare observed yield with literature or your validated theoretical benchmark.
Product yield on substrate and biomass gives extra context. It helps show whether substrate is going mostly to growth, mostly to product formation, or being lost elsewhere.
Yes. The page includes CSV and PDF download options. The exported output is useful for sharing run summaries, review notes, and supporting tables.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.