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Calculate hydroponic NPK nutrient mixing ratios and ppm targets for vegetative and flowering stages. Reservoir dosing guide.
Calculate pH Up and pH Down dosing for hydroponic nutrient solutions. Milliliters needed to reach target pH from current reading.
Convert hydroponic EC (mS/cm) to PPM (TDS) and back. Supports 500 and 700 scale conversion factors for all popular nutrient meters.
This tool applies a standard formula from the relevant domain. The computation is deterministic — given the same inputs, the result is always identical. The formula accounts for the primary variables that determine the output.
Pot dia (in) ≈ mature root spread × 1.2; 2" seedlings, 3–6" matureThe calculation requires: Crop, Stage. Each parameter contributes to the final result according to the formula above. Accuracy depends on the precision of your input measurements.
Updated: July 2026
A typical use case demonstrating the calculator with representative values.
→ Calculated result based on the formula and provided inputs
Enter your own values to get a personalized result for your specific situation.
→ Result calculated from your specific input values
This calculator uses the formula shown. Real-world results may vary due to factors not captured by the model. Use the result as an estimate and verify with domain-specific standards.
The calculation assumes ideal conditions. In practice, temperature, humidity, material quality, and other factors affect real outcomes. Apply appropriate safety margins.
Select net pot diameter based on crop type and growth stage. Free online hydroponics calculator with instant, accurate results. It applies the calculation formula (Pot dia (in) ≈ mature root spread × 1.2; 2" seedlings, 3–6" mature). For example: mature lettuce — A typical use case demonstrating the calculator with representative values.