Scape
Math
Metric
US
Aquarium filter size & flow rate calculator
Tank water volume
L
Tank type
Shrimp, fry or betta (gentle flow) · 2–4× per hour
Lightly stocked or planted · 4–6× per hour
Community tank · 6–8× per hour
Goldfish, cichlids or other messy fish · 8–10× per hour
Reef: soft corals & LPS (sump) · 3–5× per hour
Reef: SPS (sump) · 3–5× per hour
Flow lost to media & plumbing
30% filters, 50% sump returns
%
Your filter or pump rating
optional, box flow
L/h
Buy a filter rated
–
Real flow to aim for
–
Powerheads (display flow)
–
Your filter
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Free calculator by
ScapeMath
. Method, worked examples and sources on the full page.