Skip to main content

Fish Tank Calculator

Lifestyle Tools

Volume, heater, filter, stocking density

Quick Answer

Fish Tank Calculator: Volume, heater, filter, stocking density. Fish Tank Calculator uses standard everyday life formulas to compute accurate results instantly.

cm
cm
cm
cm

Room heating in winter

56 L water
Gross 64.8 L, net of substrate 61.9 L
Heater84 W
Lighting (low-high)22-45 W
Filter flow334 L/h
Small fish total length56 cm

Calculation steps

  1. 1Gross volume = 60×30×36 ÷ 1000 = 64.8 L
  2. 2Net water ≈ gross − substrate solid = 61.9 L; 90% fill → 55.7 L
  3. 3Heater = 56 L × 1.5 W/L = 84 W
  4. 4Filter flow = 6 × water = 334 L/h

Stocking & equipment rules

ItemRuleNote
Fish density1 cm/LSmall tropical fish total body length
Heater1.5–2 W/L2 W/L for unheated rooms
Lighting0.4–0.8 W/LLED lower; 0.8+ for demanding plants
Filter5–8 ×/hHourly turnover of tank volume
Water change1/4–1/3 weeklySame temperature, dechlorinated
Cycle a new tank 2–4 weeks before adding fish (nitrogen cycle: ammonia → nitrite → nitrate). The 1 cm/L rule applies to small fish only — goldfish and large cichlids need far more (a goldfish wants 40+ L each). Overfeeding is the #1 killer: feed what they finish in 2 minutes.

Was this tool helpful?

How to Use

  1. Enter scenario values: fill real-life numbers into the Fish Tank Calculator (defaults work for a quick try).
  2. Instant results: everything computes live, no button needed.
  3. Read the advice: results come with practical tips, reference standards and pitfalls.
  4. Compare options: adjust parameters to compare choices side by side.

Key Points

  • Fish Tank Calculator is a free online everyday life tool — open and use, no sign-up.
  • All calculations run locally in your browser; your data never leaves the device.
  • Key capability: Volume, heater, filter, stocking density.
  • Results come with formulas and reference tables so you can verify every number.

Formula & How It Works

Fish Tank Calculator formula

Fish Tank Calculator uses standard everyday life formulas to compute accurate results instantly.

FAQ

How do I use the Fish Tank Calculator?
Open the page and fill in the input fields — results update automatically. Volume, heater, filter, stocking density.
Are the results accurate?
Yes. Standard formulas and conversion factors are used and verified.
Is it free? Do I need to sign up?
Completely free. No registration, login or download required.
Does it work on mobile?
Yes. The responsive design works on phones, tablets and desktops.
Is my data saved?
No. Everything runs locally in your browser.

Related Tools

Related Guides

Source & Updates

Based on common formulas and industry conventions. Last updated: 2025-07

Last updated:

Formulas and content on this page are reviewed by the YiJianSuan team. For reference only — official sources prevail.

Maintained and periodically reviewed by the YiJianSuan editorial team — review process in ourEditorial Policy.

Cite this page: YiJianSuan. Fish Tank Calculator[EB/OL]. https://www.yijiansuan.com/en/c/life/fish-tank

Results provided by this tool are for reference only and do not constitute professional advice.