Aquarium Tank Volume Calculator
Calculate your aquarium volume in gallons and liters. Get fish stocking recommendations based on tank size and shape. Perfect for planning your aquatic paradise!
Tank Dimensions
Enter tank dimensions to calculate volume
Understanding Aquarium Volume
Why Accurate Volume Matters
Knowing your tank’s exact volume is crucial for:
- • Proper medication dosing
- • Water conditioner amounts
- • Fertilizer dosing for planted tanks
- • Determining appropriate bioload
- • Filter and heater sizing
Tank Shape Differences
Different tank shapes hold different volumes:
- • Rectangular: Standard calculation, most common
- • Bow-Front: Curved front adds ~10% more volume
- • Cylindrical: Uses circular base area formula
Frequently Asked Questions
Why subtract 10% for decorations?
Decorations, substrate, rocks, and equipment displace water. We subtract 10% to get a more accurate usable water volume for dosing purposes.
Is the inch per gallon rule accurate?
It’s a starting guideline, but not perfect. Consider fish body shape, activity level, territorial behavior, and waste production. Research each species specifically.
Can I stock to maximum capacity?
We recommend stocking below maximum capacity. This provides buffer for fish growth, better water quality, and less stress on your filtration system.
How do I measure an irregular tank?
For irregular shapes, measure the maximum dimensions and select the closest shape. You can also fill with a known volume of water using a measuring container.
Aquarist Reviews
“Perfect for dosing medications! Finally got the exact volume of my bow-front tank. The fish stocking guide is really helpful too.”
- Sarah M.
“Used this before setting up my 75-gallon reef tank. The accuracy helped me dose additives perfectly from day one!”
- James K.
“Great tool for beginners! The stocking recommendations kept me from overstocking my first tank. All my fish are thriving!”
- Emily R.
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