Last updated: June 1, 2026

Aquarium Volume Calculator

Calculate the volume of your aquarium in gallons and liters. Works for rectangular and cylindrical tanks.

Tank Shape

Length (inches)

Width (inches)

Height (inches)

728 × 90 Leaderboard

320 × 100 Mobile Banner

Volume Formulas

Rectangular: V = L × W × H

Cylindrical: V = π × r² × H

Gallons = Cubic Inches ÷ 231

336 × 280 Large Rectangle

300 × 250 Medium Rectangle

Convert your dog's age to human years using the updated formula.

Convert your cat's age to human years accurately.

Calculate daily food portions for dogs based on weight and activity.

Estimate monthly and yearly dog food costs based on breed size.

Estimate monthly and yearly cat food costs.

Calculate recommended daily exercise for your dog by breed size and age.

A common rule is 1 inch of fish per gallon of water. More space is always better for fish health.

No — gravel, rocks, and decorations reduce actual water volume by roughly 10-15%.