Is 1 inch per gallon accurate?

It's a starting point only. Body shape, waste output, and swim style matter more.

Yes — every FurTools tool is free forever, no signup required.

Do you store my inputs?

No. Everything runs in your browser and nothing is sent to our servers.

Estimate a safe stocking level using the modern bioload approach — not just inches-per-gallon.

Water volume (gal)

Combined adult fish length (in)

Filter turnover (× tank volume /hr)

Bioload

30%

Comfortable

Under 80% is a safe long-term target.