Water Quality Index Calculator: Concentration to WQI

Water Quality Index Calculator

This calculator converts water parameters into Water Quality Index (WQI) using a simplified multivariate weighted arithmetic scientific method. WQI is a single unitless number to reflect the overall quality of water resources.

Interpretation of WQI

  1. WQI < 50: Excellent quality of water.
  2. WQI 50.01 – 100: Good quality of water.
  3. WQI 100.01 – 200: Poor quality of water.
  4. WQI 200.01 – 300: Inferior quality of water.
  5. WQI > 300: Unfit for direct use.


Water Quality Index calculator is designed based on the widely accepted scientific method for education and research.

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