Conductivity Temperature Salinity Conversion
Conductivity Basics
Conductivity measures how easily water carries current. Dissolved ions raise that value. Sodium, chloride, magnesium, sulfate, and other ions all contribute. Temperature also matters. Warm water conducts better than cold water. That is why a salinity estimate should include a temperature term.
Why Temperature Matters
A raw conductivity reading can mislead users. Two samples can contain the same salt load, but show different conductivity at different temperatures. The correction used here follows the practical salinity approach at zero pressure. It compares the adjusted sample ratio with the standard seawater ratio. This gives a practical salinity value, not a direct mass test.
Best Uses
This calculator is useful for aquarium checks, field notes, lab screening, irrigation review, and marine conversion tasks. It works best for seawater dominated samples. It can also help with brackish water, when the ion mix is close to natural seawater. Fresh water, industrial water, fertilizer runoff, or unusual brines may need laboratory analysis.
Input Quality
Good results start with a clean probe. Rinse the sensor before use. Remove bubbles from the cell. Let the reading stabilize. Enter the temperature measured at the same time as conductivity. Use the calibration multiplier only when you know the instrument error. Use the dilution factor when a sample was diluted before measurement.
Reading Results
The output shows practical salinity, an approximate parts per thousand value, and the conductivity ratios used by the formula. The value is dimensionless, but it is often compared with ppt for common reporting. A ratio near one at fifteen degrees represents standard seawater near salinity thirty five. Lower ratios usually indicate fresher water.
Practical Limits
No online calculator replaces a calibrated salinometer. Pressure, probe design, cell constant, and ion composition can affect the final answer. For compliance work, verify the result with accepted methods. For routine conversion work, this page gives a clear estimate and keeps the calculation trace easy to review, export, and repeat.
Exporting Results
The download buttons help save each calculation. CSV suits spreadsheets and records. PDF suits reports and sharing. Keep the sample label clear. Add notes in your own log. Repeat measurements after calibration, before decisions are made. Comparing several readings often reveals probe drift, mixing errors, or temperature mistakes.