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PPM / Percent / PPB Concentration Converter

Convert one dimensionless concentration value between percent, per-mille, ppm, ppb, ppt, mg/kg, and approximate mg/L for water-like solutions. No molar mass is needed.

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Input

Use a non-negative number. Scientific notation such as 1.2e3 is accepted.

Result

Equivalent concentration units
Unit Value Assumption

Formula


	      
mg/L is shown as a water approximation using density ≈ 1 kg/L. Other liquids and gases need density, molecular weight, temperature, or pressure.

	      
Use these values as educational ratio references. Verify regulated, laboratory, or safety-critical reports with the required method and unit convention.

	    

  


  

    
How to use this converter

    
    
      
  1. Enter one concentration value, such as 5,000 ppm or 0.05%.
    2. 
      
  2. Choose the unit you entered.
    3. 
      
  3. Read all equivalent values in the table. Use the formula lines to check the main ppm and percent conversions.
    4. 
    

    
Use gas-phase ppm ↔ mg/m³ conversion when the task depends on molecular weight, temperature, and pressure. Use the concentration and pH calculator when the task involves molarity, dilution, or pH.

  


  

    
Quick reference

    

      

        Common concentration relationships
        
ValueEquivalent

        
      

    

    
These are ratio conversions. Regulatory or lab reports may define basis, density, dry/wet gas conditions, or rounding rules separately.

  


  

    
FAQ

    

      How do I convert ppm to percent?
      
Divide ppm by 10,000. For example, 5,000 ppm ÷ 10,000 = 0.5%.

    

    

      How many ppm are in 1 percent?
      
1% equals 10,000 ppm. It also equals 10 per mille, 10,000 mg/kg, and about 10,000 mg/L for water-like solutions.

    

    

      Is ppm the same as mg/L?
      
ppm is a ratio. In water-like solutions with density near 1 kg/L, 1 ppm is often approximated as 1 mg/L. Other liquids and gases need their own density or gas-law conversion.

    

    

      Can this convert gas ppm to mg/m3?
      
No. Gas ppm to mg/m3 depends on molecular weight, temperature, and pressure. Use the gas ppm to mg/m3 calculator for that case.

    

    

      Does this calculate molarity?
      
No. Molarity needs molar mass and volume assumptions. Use the concentration and pH calculator when the task involves mol/L, dilution, or pH.