Aquarium Fertilizer Calculator

Determine dry chemical amounts (KNO₃, KH₂PO₄, K₂SO₄) to mix a stock solution targeting specific nutrient increases per dose.

Calculation Parameters

Aquarium Volume (Liters):

Stock Solution Volume (ml):

Dose Volume (ml):

Target NO₃^- / Dose (ppm):

Target PO₄^3- / Dose (ppm):

Target K⁺ / Dose (ppm):

Chemical Properties (Optional)

Densities estimate dry volume (ml) and water needed. Adjust if needed.

KNO₃ Density (g/ml):

KH₂PO₄ Density (g/ml):

K₂SO₄ Density (g/ml):

Determine amounts of dry chemicals (KNO₃, KH₂PO₄, K₂SO₄) to add directly to the aquarium for a target ppm increase.

Calculation Parameters

Aquarium Volume (Liters):

Target NO₃^- Increase (ppm):

Target PO₄^3- Increase (ppm):

Target K⁺ Increase (ppm):

Chemical Properties (Optional)

Densities estimate the dry volume (ml) equivalent.

KNO₃ Density (g/ml):

KH₂PO₄ Density (g/ml):

K₂SO₄ Density (g/ml):

Calculate resulting nutrient ppm increase per dose based on your stock solution recipe.

Stock Solution Recipe & Dosing

Input Chemical Amounts In: Grams (g) Milliliters (ml)

KNO₃ Used (grams):

KH₂PO₄ Used (grams):

K₂SO₄ Used (grams):

Total Solution Volume (ml):

Dose Volume (ml):

Aquarium Volume (Liters):

Chemical Properties (Densities)

Densities (g/ml) are needed if inputting chemical amounts in milliliters (ml).

KNO₃ Density (g/ml):

KH₂PO₄ Density (g/ml):

K₂SO₄ Density (g/ml):

It is easier to measure TDS than GH, nitrates, phosphates etc. This calculator calculates the TDS contribution and approximates TDS pen readings when adding various salts to your tank.

Tank Parameters

Tank Size (Liters):

Salt Amounts (grams)

Enter the amount of each salt you want to add to your tank. Leave blank or 0 for salts you're not using.

KNO₃:

KH₂PO₄:

K₂SO₄:

MgSO₄·7H₂O:

CaCl₂·2H₂O:

NaHCO₃:

KCl:

Ca(NO₃)₂·4H₂O:

Fe-DTPA (11% Fe):

Aquarium Fertilizer Calculator

Calculation Parameters

Chemical Properties (Optional)

Calculation Parameters

Chemical Properties (Optional)

Stock Solution Recipe & Dosing

Chemical Properties (Densities)

TDS Calculator Explanation

Tank Parameters

Salt Amounts (grams)