PPM to mg/L Converter

Convert parts per million (ppm) to milligrams per liter (mg/L). For water: 1 ppm = 1 mg/L.

ppm

MILLIGRAMS PER LITER

500 mg/L

IN g/L

0.5 g/L

IN %

0.05%

NOTE

1 ppm β‰ˆ 1 mg/L (water)

πŸ’‘ How to Convert PPM to mg/L

PPM to mg/L Conversion

For dilute aqueous solutions at standard conditions, parts per million and milligrams per liter are numerically equivalent:

1 ppm = 1 mg/L

This equality holds because 1 liter of water has a mass of approximately 1,000,000 mg. Therefore, 1 mg dissolved in 1 liter of water is 1 part per 1,000,000 parts = 1 ppm.

Density Corrections

For non-aqueous solutions or highly concentrated solutions where the density differs significantly from 1 g/mL, the conversion requires a density correction factor: mg/L = ppm Γ— density (g/mL). Use our mg/L to PPM converter for the reverse conversion.

πŸ”— Related Calculators

mg/L to PPM ConverterConvert milligrams per liter (mg/L) to parts per million (ppm). For water: 1 mg/L β‰ˆ 1 ppm.PPM CalculatorCalculate parts per million (ppm) from a part-to-whole ratio. Used in water quality, air quality, and manufacturing.PPM ConverterUniversal PPM converter β€” convert between ppm, percent (%), ppb, and mg/L in one tool with quick reference table.