Calculate the mass of a fertilizer product needed to reach a target elemental concentration in a hydroponic solution. Enter tank volume, target parts per million, nutrient analysis, and an optional source-water contribution.
Element needed (g) = (Target ppm − Source ppm) × Volume (L) ÷ 1,000
Product mass = Element needed ÷ Product nutrient fraction
The main result is fertilizer product mass, not pure elemental mass. The analysis percentage converts between the two.
Check whether the label reports elemental nutrient or an oxide equivalent. Confirm compatibility, solubility, EC, and pH before dosing a live system.
For 2,000 L, raising concentration from 20 to 150 ppm requires 260 g of element. At 15% analysis, product needed is 1,733.3 g.
For dilute water solutions, ppm is conventionally approximated as milligrams per liter.
This addition-only calculator cannot remove nutrient; reduce source concentration or blend water first.
Enter the same elemental basis used by your target concentration.
Use the actual guaranteed analysis; no separate purity adjustment is applied.
Follow product instructions and compatibility procedures; concentrated additions may need staged dilution.
| Item | Meaning |
|---|---|
| Target ppm | Desired final elemental concentration |
| Source ppm | Measured contribution already in the water |
| Analysis | Elemental nutrient share of the product |
| Product mass | Fertilizer mass required to supply the deficit |