Hydroponic Nutrient Calculator
Free tools for hydroponic growers — an EC/PPM scale converter, a baseline-corrected dosing and dilution calculator, and a sourced crop EC/pH reference chart.
Before you dose a reservoir: these are planning aids based on published conversion factors and university extension guidance, not a substitute for your own meter readings or your nutrient brand’s own feeding chart. Always confirm your meter’s actual conversion scale in its manual — see the EC/PPM converter page for why that matters.
EC / PPM converter
Convert between EC (mS/cm) and PPM under the 500, 640, or 700 meter scale — the same reading means very different ppm numbers depending on your meter.
Nutrient dosing & dilution calculator
Find the total meter reading to aim for after accounting for your source water's own baseline EC, or how much water to add to dilute an over-strength reservoir.
Crop EC / pH reference chart
Sourced target EC and pH ranges by crop, from university extension hydroponics guides.