Hydroponic Nutrient Calculator
Nutrient Solution Mixing
Calculate nutrient concentrate amounts for your reservoir
Reservoir Sizing
Calculate reservoir size based on number of plants
Formula
PPM = EC (mS/cm) × 500 | Reservoir Size = Plants × Gallons per Plant × System Multiplier | Nutrient (ml) ≈ EC × 2.5 × Gallons
Frequently Asked Questions
What EC/PPM should I use for hydroponics?
EC targets vary by crop: Leafy greens 0.8-1.4 mS/cm, Herbs 1.0-1.6, Tomatoes/Peppers 1.8-2.5, Strawberries 1.4-1.8, Cucumbers 1.6-2.2. Seedlings should start at half strength and increase gradually.
What is the ideal pH for hydroponic growing?
Most hydroponic crops thrive at pH 5.5-6.5, with 5.8-6.2 being the sweet spot. pH affects nutrient availability - too high or low locks out specific nutrients. Check and adjust pH daily.
How often should I change hydroponic nutrient solution?
Change your nutrient solution every 7-14 days, or when EC drifts more than 30% from target. Top off with plain water between changes. Complete reservoir changes prevent salt buildup and nutrient imbalances.
You may also need
~
Grow Light Calculator
Free grow light calculator. Calculate how many grow lights you need, wattage requirements, and optimal light height based on your grow space and plants.
Everyday~
Garden Water Needs Calculator
Free garden watering calculator. Calculate how much water your garden needs per week based on garden size, plant types, climate, and soil conditions.
Everyday~
Soil pH Adjustment Calculator
Free soil pH adjustment calculator. Calculate how much lime or sulfur to add to raise or lower your soil pH for optimal plant growth and nutrient availability.
Everyday