Nutrient Solution Calculator
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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.
Calculate hydroponic reservoir volume from plant count, system type, and refill interval. Size nutrient tanks for DWC, NFT, and drip systems.
Total dissolved solids (TDS) targets vary by crop. Lettuce runs lower (600–900); fruiting plants (tomato, pepper) peak higher during bloom.
Seedling: 400–600 | Veg: 800–1200 | Bloom: 1200–1600 ppmCommercial nutrients list ppm per ml per liter. Divide target by stock concentration to find ml of A and B parts per reservoir volume.
ml = (Target ppm × Volume L) ÷ (Stock ppm × 10)Vegetative growth favors nitrogen. Flowering shifts to phosphorus and potassium. Match ratio to growth stage for optimal yield.
Veg: 3-1-2 | Bloom: 1-3-2 (N-P-K)Updated: July 2026
Target 800 ppm with 1000 ppm/ml concentrate: 16 ml Part A + 16 ml Part B for biweekly reservoir change.
Shift from 3-1-2 veg formula at 1000 ppm to 1-3-2 bloom at 1400 ppm over one week as first flowers appear.
500L reservoir at 1200 ppm requires 400 ml each of A and B concentrate — scale linearly from small reservoir calculations.
Precise nutrient concentration is critical for hydroponic success. Enter crop type, growth stage, reservoir volume, and target ppm for nitrogen, phosphorus, and potassium to calculate milliliters of concentrate per reservoir fill.