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PPM Converter

Convert between parts-per-million (PPM) and other units.

Conversions
PPM Converter
Convert between Parts Per Million (PPM) and other units.

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Understanding Small Concentrations

This Parts-Per-Million (PPM) Converter is a simple tool for converting concentration values. It allows you to easily switch between PPM and percentage (%), which is useful in chemistry, environmental science, and many other fields where very small concentrations need to be expressed.

The Conversion Formula Explained

'Parts-per-million' is a way of expressing a very dilute concentration of a substance.

  • From Percentage to PPM: PPM = Percentage * 10,000
  • From PPM to Percentage: Percentage = PPM / 10,000

How to Use the Calculator

This is a real-time, two-way converter.

  • Enter a value in the Parts Per Million (PPM) field, and the Percentage (%) field will update automatically.
  • Alternatively, enter a value in the Percentage (%) field, and the PPM field will update.

Real-World Example

  • The allowable concentration of chlorine in a swimming pool is about 3 PPM.
    • Enter 3 in the PPM field. The calculator will show this is equivalent to 0.0003%.
  • A solution is 0.5% salt by mass.
    • Enter 0.5 in the Percentage field. The calculator will show this is equivalent to 5,000 PPM.

Frequently Asked Questions (FAQ)

  • What does 'parts-per-million' actually mean? It means 'one part in one million'. Imagine a million grains of sand, and one of them is red. The concentration of red sand is 1 PPM. For liquids, 1 PPM is equivalent to 1 milligram per liter (mg/L).
  • Are there other similar units? Yes. You might also see PPB (parts-per-billion) or PPT (parts-per-trillion) for even smaller concentrations.
    • 1 PPM = 1,000 PPB
    • 1 PPB = 1,000 PPT
  • Why not just use percentages? When concentrations are very small, using percentages results in many leading zeros after the decimal point (like 0.0003%), which can be cumbersome to read and write. PPM provides a more convenient whole number.