Mixing the correct nutrient solution for your hydroponics system starts with one simple question: how much water are you actually using?

Guessing your reservoir volume can lead to weak nutrient solutions or, worse, burnt plant roots.

Our simple water volume calculator removes all guesswork. Just select your tank shape - whether it’s a cylinder, rectangle, or cube - enter the dimensions, and get an instant, accurate calculation of your total reservoir volume.

The tool automatically provides the results in both liters and gallons, so you can follow any feeding chart with confidence.

Use this free tank volume calculator every time you mix to ensure your plants get the precise amount of nutrients they need for healthy, vigorous growth. It’s the easiest way to guarantee a perfect mix.