Hydroponic Nutrient EC ↔ PPM (500 & 700 Scale) & Reservoir Dosing Calculator

Convert hydroponic EC (mS/cm) ↔ TDS 500/700 ppm and dose nutrient reservoirs.

Nutrient Concentrate to Add
140 mL
Target TDS (NaCl 500 Scale) 900 ppm (500)
Target TDS (Truncheon 700 Scale) 1,260 ppm (700)
EC Deficit Boost (ΔEC) 0.7 mS/cm
Inputs
mS/cm
Current measured reservoir Electrical Conductivity (mS/cm).
mS/cm
Target crop nutrient Electrical Conductivity (mS/cm).
gallons
Hydroponic reservoir water volume in US gallons.
mL/gal/EC
Nutrient concentrate mL per gallon required to raise EC by 1.0 mS/cm.
Results & Graph
Nutrient Concentrate to Add
140 mL
Target TDS (NaCl 500 Scale)
900 ppm (500)
Target TDS (Truncheon 700 Scale)
1,260 ppm (700)
EC Deficit Boost (ΔEC)
0.7 mS/cm

Nutrient Concentrate to Add

Graph 1 • Current Ec Ms Cm Sensitivity Recalculates the domain equation across 50% to 150% of the primary input while holding other parameters constant.
0 mL 135 mL 270 mL 50%: 250 mL 250 50% 75%: 195 mL 195 75% 100%: 140 mL 140 100% 125%: 85 mL 85 125% 150%: 30 mL 30 150%
Graph 2 • Primary & Supporting Metric Comparison Compares the primary output alongside supporting domain benchmarks.
Nutrient Concentrate to Add 140 mL Target TDS (NaCl 500 Scale) 900 ppm (500) Target TDS (Truncheon 700 Scale) 1,260 ppm (700) EC Deficit Boost (ΔEC) 0.7 mS/cm
Graph 3 • Exact Output Table & Units Displays each calculated output in its exact domain unit.
Nutrient Concentrate to Add140 mLTarget TDS (NaCl 500 Scale)900 ppm (500)Target TDS (Truncheon 700 Scale)1,260 ppm (700)EC Deficit Boost (ΔEC)0.7 mS/cm
Summary: To raise a 40-gallon reservoir from 1.1 to 1.8 mS/cm (+0.7 mS/cm), add 140 mL (28 tsp) of nutrient concentrate.
Summary: To raise a 40-gallon reservoir from 1.1 to 1.8 mS/cm (+0.7 mS/cm), add 140 mL (28 tsp) of nutrient concentrate.
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Formula & Mathematical Methodology: Hydroponic EC & PPM Formula

PPM500 = ECmS/cm × 500
PPM700 = ECmS/cm × 700
DosemL = ReservoirGal × (TargetEC − CurrentEC) × DoseRate
PPM_500 = EC_mS/cm × 500; PPM_700 = EC_mS/cm × 700; Dose_mL = ReservoirGal × (TargetEC − CurrentEC) × DoseRate
  • currentEcMsCm: Current Ec Ms Cm (mS/cm)
  • targetEcMsCm: Target Ec Ms Cm (mS/cm)
  • reservoirVolumeGallons: Reservoir Volume Gallons (gallons)
  • mlPerGallonPer1Ec: Ml Per Gallon Per1 Ec (mL/gal/EC)

Rounding: Physical package counts round up where appropriate; continuous measurements round to 2 decimal places.

Worked Example: Practical Benchmark: Hydroponic EC & PPM

Convert hydroponic EC (mS/cm) ↔ TDS 500/700 ppm and dose nutrient reservoirs.

  1. Enter your project dimensions, machining speeds, or recipe weights.
  2. Compute the governing equation: PPM_500 = EC_mS/cm × 500; PPM_700 = EC_mS/cm × 700; Dose_mL = ReservoirGal × (TargetEC − CurrentEC) × DoseRate.
  3. Review the primary result, supporting dimensions, and 3 SVG visualizations.
Result: Computes Hydroponic EC & PPM via PPM_500 = EC_mS/cm × 500; PPM_700 = EC_mS/cm × 700; Dose_mL = ReservoirGal × (TargetEC − CurrentEC) × DoseRate.

Frequently Asked Questions

How does the Hydroponic Nutrient EC ↔ PPM (500 & 700 Scale) & Reservoir Dosing Calculator calculate results?

It evaluates PPM_500 = EC_mS/cm × 500; PPM_700 = EC_mS/cm × 700; Dose_mL = ReservoirGal × (TargetEC − CurrentEC) × DoseRate directly in your browser and plots three custom SVG visualizations.

Can I compare different material dimensions or batch sizes side by side?

Yes. Click "Compare (0/3)" in the results toolbar to pin up to 3 scenarios side by side.

Can I print a clean shop or kitchen reference sheet?

Yes. Click the Print button in the results toolbar for a distraction-free worksheet.

Science & Engineering · Agronomy & Environmental Science

Hydroponic Nutrient EC ↔ PPM (500 & 700 Scale) & Reservoir Dosing Calculator: inputs, method, and how to read the result

Convert hydroponic EC (mS/cm) ↔ TDS 500/700 ppm and dose nutrient reservoirs.

Choose inputs for the case you are checking

The defaults are illustrative. Replace them with values for your case and keep the units shown beside each field.

  • Current Ec Ms Cm: Current measured reservoir Electrical Conductivity (mS/cm).
  • Target Ec Ms Cm: Target crop nutrient Electrical Conductivity (mS/cm).
  • Reservoir Volume Gallons: Hydroponic reservoir water volume in US gallons.
  • Ml Per Gallon Per1 Ec: Nutrient concentrate mL per gallon required to raise EC by 1.0 mS/cm.

What the calculation includes

With the default values shown, Nutrient Concentrate to Add is 140 mL. The calculation follows Hydroponic EC & PPM Formula; the formula and variable definitions above show how the inputs combine.

One-input check: With the other defaults held constant, changing Current Ec Ms Cm from 1.1 mS/cm to 1.21 mS/cm changes Nutrient Concentrate to Add from 140 mL to 118 mL. This is a comparison inside the calculator's stated model, not a prediction.

Where to use caution

  • Uses standard North American & metric trade dimensions, Machinery’s Handbook formulas, and culinary weight ratios.
  • Verify local municipal building codes, tool manufacturer limits, and food-safety time/temperature tables before execution.

Scope: Trade, Shop & Culinary Science Reference Standard Check the assumptions and limitations against your situation before relying on the estimate.

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