📖 Overview
This calculator turns nutrient targets into practical milliliter dosing steps.
It helps avoid overcorrection by combining tank volume concentration strength and safe daily increase limits.
🧪 Example Scenarios
Use these default and higher-pressure example inputs to explore how sensitive this calculator is before using your real numbers.
| Input | Base Case | Higher Pressure Case |
|---|---|---|
| Tank Or Reservoir Volume (liters) | 180 | 207 |
| Target Nutrient Level (ppm) | 35 | 40.25 |
| Solution Strength (mg per mL) | 120 | 138 |
| Current Nutrient Level (ppm) | 8 | 9.2 |
| Safe Max Daily Increase (ppm) | 10 | 11.5 |
⚙️ How It Works
Converts ppm target changes into precise milliliter dosing and a safe multi-day ramp so nutrient corrections are controlled.
The Formula
Dose mL = (Volume L × Δppm) ÷ (Strength mg/mL)
| Volume | True working water volume in liters |
| Target ppm | Desired concentration level after adjustment |
| Strength | Solution concentration in mg per mL |
| Current ppm | Measured current concentration |
| Safe Daily Increase | Maximum ppm rise allowed per day |
💡This calculator is scenario-based. Better input quality leads to better decision quality.
⚠️Large one-shot dosing can shock livestock and root systems. Follow ramp guidance and re-test between steps.
Quick Reference
| Volume | Δppm | Strength | Dose Needed |
|---|---|---|---|
| 100L | 10 | 100 mg/mL | 10 mL |
| 180L | 20 | 120 mg/mL | 30 mL |
| 250L | 15 | 80 mg/mL | 46.9 mL |
When To Use This
- Use this tool when you need a fast decision during active planning or execution.
- Use this before committing money, time, or tradeoffs that are hard to reverse.
- Use this to compare options using the same assumptions across scenarios.
Edge Cases To Watch
- Results can be misleading if key inputs are missing, stale, or unrealistic.
- Very small or very large values may amplify rounding effects and interpretation risk.
- If assumptions change mid-decision, recalculate before acting.
Practical Tips
💡 Use post-water-change volume not display tank sticker volume.
💡 Re-measure ppm after each dose block before continuing.
💡 Document product concentration since brands vary significantly.
Frequently Asked Questions
❓ Why does tank volume matter so much?
Dose required scales linearly with total water volume.
❓ Can I use this for hydroponics reservoirs?
Yes. The same concentration math applies when ppm and concentration units are consistent.