PPM to mg/L Converter
Convert parts per million (ppm) to milligrams per liter (mg/L). For dilute aqueous solutions, 1 ppm ≈ 1 mg/L.
- Assumes dilute aqueous solution at standard conditions (4°C, 1 atm)
- For other solutions or conditions, density adjustments may be needed
- PPM is by mass for solutions; mg/L is mass per volume
Formula
For dilute aqueous solutions (like water at 4°C where density ≈ 1 g/mL): Converted Value = Input Value (the relationship is approximately 1:1)
Example Calculation
Inputs
- Value: 100
- Convert: ppm
Enter 100 ppm and select PPM → mg/L. The result shows 100 mg/L because for water solutions, the conversion is approximately 1:1.
Frequently asked questions
What is PPM?
PPM (parts per million) is a unit of concentration equal to 1 mg/kg or 1 µg/g. For dilute solutions, 1 ppm ≈ 1 mg/L.
What is mg/L?
mg/L (milligrams per liter) is a metric unit of concentration. 1 mg/L = 0.001 g/L.
Why is the conversion 1:1 for water?
Water at 4°C has a density of approximately 1 g/mL, so 1 kg = 1 L. Therefore, 1 ppm (mg/kg) ≈ 1 mg/L.
When is this used?
Water quality testing, air quality measurements, environmental monitoring, and chemical concentration calculations.
Is this exact?
For water at standard conditions, yes. For other solutions or different temperatures, consult a chemistry reference.