Per Macro Dose
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KNO₃, KH₂PO₄, K₂SO₄, MgSO₄·7H₂O
Aquarium Nutrient Dosing Calculator (EI • Lean • Custom)
Build a precise macro/micro dosing plan for planted tanks. Choose EI, Lean, or Custom targets, sync to your weekly water change, and get per-dose grams or mL from stock solutions. A mini chart shows weekly NO₃/PO₄/K trends.
Per-Dose Amounts & Weekly Summary
Enter tank, method and targets to see dry grams and optional mL from stock.
Per Micro Dose
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Trace (CSM+B or Fe DTPA)
K from NO₃ & PO₄
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Auto-adds K₂SO₄ only if needed
Weekly Totals
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Macros+Micros; check vs targets
Weekly Trend (ppm) — NO₃ / PO₄ / K
Assumes even spacing or WC-synced dosing and daily uptake %; for visualization only.How This EI / Lean / Custom Calculator Works
Weekly ppm targets are split across your chosen number of macro/micro doses. We convert ppm to mg/L, then to grams of salts (KNO₃, KH₂PO₄, K₂SO₄, MgSO₄·7H₂O) and optionally to mL from stock based on your bottle recipes. Potassium supplied by nitrate and phosphate sources is credited first; any shortfall to your K target is topped up with K₂SO₄.
Typical Presets
- EI (high growth): NO₃ 20–30, PO₄ 3, K 20–30, Mg ~5, Fe 0.5 ppm/week; 50% weekly WC.
- Lean (low-moderate): NO₃ 7–10, PO₄ 0.7–1, K 10–15, Mg ~2, Fe 0.15–0.2 ppm/week.
Best Practices
- Consistency: Dose macros and micros on alternate days; avoid mixing in the same bottle.
- Water changes: Reset accumulation weekly; dose macros right after WC for steady levels.
- Balance: Match light and CO₂ to nutrients. High light without CO₂ invites algae.
- Verification: Use reliable test kits sparingly; observe plant growth and algae as primary signals.
FAQs — EI vs Lean, Grams vs mL, and K from Salts
Do I still need K₂SO₄ with EI?
Often not—K from KNO₃ and KH₂PO₄ can meet the K target. This tool only adds K₂SO₄ when needed.
Can I combine all macros in one bottle?
Yes, macros can be combined; micros should be separate. This tool expects per-salt stock concentrations to compute mL per dose.
How accurate is the weekly trend chart?
It’s an estimate using your water change and daily uptake settings to visualize peaks/troughs. Fine-tune with observations.
