Fish Growth Rate Calculator
Calculate specific growth rate from initial and final fish mass over elapsed days.
A QUICK WALKTHROUGH
How to use this tool
- Enter initial fish mass, final fish mass, and elapsed days.
- Use the same mass unit for both measurements.
- Calculate the specific growth rate and review its limits.
Formula and limitations
SGR (%/day)=100×(ln(final mass)−ln(initial mass))/days. This is a measured growth summary, not a husbandry recommendation. This calculation summarizes measured growth; it does not assess feed, water quality, or fish health.
Privacy
Inputs are processed locally and not uploaded.
GOOD TO KNOW
Common questions
How is specific growth rate calculated?
SGR (%/day) = 100 × (ln(final mass) − ln(initial mass)) ÷ elapsed days. Both masses and days must be positive, and the mass units must match.
Does this assess fish health or recommend care?
No. It summarizes the two mass measurements and elapsed time; it does not assess feed, water quality, or fish health.