Welcome!
Complete the form below by clicking through each step.
This calculator is designed to guide even the most novice growers — even if you’ve had a “black thumb” in the past, we’ll walk you through exactly what you need to grow successful crops.

Click each step header to open it and move through the calculator.
Choose whether you are using a single nutrient powder or a two‑part powder system. This helps the calculator understand how your Base EC was established.
Important: Only select Dedicated Fruiting or Mixed Crop once flowers or fruits begin forming.
Until then, keep your selection on Dedicated Vegetative, even if you are growing a fruiting crop.

This prevents over‑feeding young plants and keeps nutrients matched to their developmental stage.
Establishing your Base EC ensures your nutrient calculations are accurate.
If you already know your Base EC values, select Yes below and enter them.
If not, select No and follow the mixing instructions to generate your Base EC.
  • DO NOT MIX both parts without fully dissolving Part 1 or it will cause precipitate.
  • Your EC meter may display in mS/cm or ”S/cm. Select the correct unit below.
You’re almost there — now we just need your current EC, your target EC, and your reservoir size.

Always measure your current EC after topping off your reservoir.
Measuring before topping off will produce inaccurate results and may lead to under‑feeding.

Best Practice: Use a 1‑liter beaker and a magnetic stirrer to mix your nutrients before adding them to your reservoir.
Hover to see exact values once calculated.
While this calculation is for your current refill, you can print your recipe and reuse your Base EC values anytime.
You only need to re‑measure Base EC if you change nutrients or water sources.