Aquarium Calculators & Tools
Free tools to help you maintain a healthy aquarium or pond. Calculate volumes, check fish compatibility, and determine equipment needs.
Pond Volume Calculator
Calculate pond water volume in gallons and liters. Get accurate measurements for koi ponds, garden ponds, and water features. Essential for filtration sizing, fish stocking, and water treatments.
Fish Tank Volume Calculator
Calculate aquarium water volume instantly. Free fish tank gallon calculator for rectangular, bow front & cylinder tanks. Accurate results for medication dosing & equipment sizing.
Fish Compatibility Chart & Checker
Check aquarium fish compatibility instantly. Our comprehensive freshwater fish compatibility chart helps you choose peaceful tank mates and avoid aggressive combinations. Visual compatibility matrix included.
Aquarium Substrate Calculator - Sand & Gravel
Calculate exactly how much sand, gravel, or aquarium substrate you need. Free substrate calculator tells you pounds needed for any tank size. Perfect for planted tanks and reef aquariums.
Aquarium Heater Size Calculator - Wattage Guide
Find the perfect heater wattage for your fish tank. Our aquarium heater size calculator factors in tank size, room temperature, and desired water temperature for tropical fish and planted tanks.
Why Use Our Calculators?
- Accurate Calculations: All formulas are based on industry standards and verified by aquarium professionals.
- Easy to Use: Simple interfaces designed for both beginners and experienced aquarists.
- Mobile Friendly: Use our tools on any device, anywhere.
- No Registration Required: All tools are free to use without creating an account.
Need Supplies?
After using our calculators, find local stores that carry what you need.