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Find local stores

Done with the math? Find aquarium stores near you to source what you need.

Stores near meBrowse by state

Popular tools

  • Tank volume
  • Fish compatibility
  • Heater size
  • Substrate
  • Pond volume
  1. Home
  2. ›
  3. Tools

Workbench

Free aquarium tools.

Tank volume, pond gallons, substrate weight, heater wattage, fish compatibility — calculators to keep your tank dialed in. No email walls, no upsells.

5 calculators · no sign-up · no usage limits
  • No. 01

    Pond Volume Calculator

    Calculate pond water volume in gallons and liters. Accurate measurements for koi ponds, garden ponds, and water features.

    Gallons · Liters · Liner sizeOpen
  • No. 02

    Fish Tank Volume Calculator

    Free fish tank volume calculator for rectangular, bow front, and cylinder tanks. Get gallons and liters instantly.

    Rectangular · Bow front · CylinderOpen
  • No. 03

    Fish Compatibility Chart & Checker

    Check aquarium fish compatibility instantly. Freshwater compatibility chart to choose peaceful tank mates and avoid aggression.

    Freshwater · Tank mates · AggressionOpen
  • No. 04

    Aquarium Substrate Calculator - Sand & Gravel

    Calculate how much sand, gravel, or substrate you need. Free calculator gives pounds needed for any tank size.

    Sand · Gravel · Aqua soilOpen
  • No. 05

    Aquarium Heater Size Calculator - Wattage Guide

    Find the right heater wattage for your fish tank. Factors in tank size, room temperature, and target water temp.

    Wattage · Tropical · SizingOpen

Why these

Built by keepers, for keepers

Accurate

Industry-standard formulas verified by aquarium professionals — gallons-per-cubic-foot, substrate density tables, watts-per-gallon adjusted for room temperature delta.

Calm

No email gates, no upsells, no banner ads. Open the page, run the math, screenshot the result, close the tab. That's it.

Mobile-friendly

Touch-optimized inputs and visualizations. Use them at the store next to a glass tank, or in front of your stand at home.

Free

No sign-up. No account. No usage limit. Permanent.

Reference

Frequently asked questions