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How Many Gallons Is Your Fish Tank?

Built by Kevin Glover · @gloverbuilds · Verified formula

Calculate aquarium volume in gallons and liters from tank dimensions. Rectangular, bowfront, and cylindrical tanks.

📅 Updated April 2026 ✅ Formula verified 📖 4 min read 🆓 Free · No sign-up

In this article

Why Exact Volume Matters
Weight Considerations

Formeln

Rechteckig: L × B × H (cm) ÷ 1.000 = Liter. 80×35×45 = 126 Liter. Das reale Volumen ist 10-15% weniger als berechnet (Bodengrund, Deko verdrängen Wasser). Ein 200-Liter-Aquarium wiegt komplett ~240+ kg — Tragfähigkeit prüfen!

Größenempfehlung

Anfänger: mindestens 60 Liter (besser 100+). Größer = stabiler = einfacher. In Deutschland: Juwel und Eheim sind die führenden Aquariumhersteller.

⚡ CalcWolf Insight

Subtract 10-15% from your calculated volume for the "real" water volume after substrate, rocks, wood, and equipment displace water. A 20-gallon tank with 2 inches of gravel and a few decorations holds about 17-18 gallons of actual water.

Frequently asked questions

Wie berechne ich das Volumen?▾

L × B × H in cm ÷ 1.000 = Liter.

Welche Größe zum Start?▾

Mindestens 60, besser 100+ Liter. Je größer, desto stabiler und einfacher.

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Kevin Glover · @gloverbuilds

Founder, CalcWolf · GLVTS · Blickr

All formulas sourced from primary references — IRS publications, peer-reviewed research, and official standards. Results are tested against independent reference calculators before publishing. Rates and brackets updated when official sources change. Editorial policy →