Workbench
Tank volume, pond gallons, substrate weight, heater wattage, fish compatibility — calculators to keep your tank dialed in. No email walls, no upsells.
Calculate pond water volume in gallons and liters. Accurate measurements for koi ponds, garden ponds, and water features.
Free fish tank volume calculator for rectangular, bow front, and cylinder tanks. Get gallons and liters instantly.
Check aquarium fish compatibility instantly. Freshwater compatibility chart to choose peaceful tank mates and avoid aggression.
Calculate how much sand, gravel, or substrate you need. Free calculator gives pounds needed for any tank size.
Find the right heater wattage for your fish tank. Factors in tank size, room temperature, and target water temp.
Why these
Industry-standard formulas verified by aquarium professionals — gallons-per-cubic-foot, substrate density tables, watts-per-gallon adjusted for room temperature delta.
No email gates, no upsells, no banner ads. Open the page, run the math, screenshot the result, close the tab. That's it.
Touch-optimized inputs and visualizations. Use them at the store next to a glass tank, or in front of your stand at home.
No sign-up. No account. No usage limit. Permanent.
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