mg/L to PPM Converter

Convert milligrams per liter (mg/L) to parts per million (ppm) — and back. Instant results.

mg/L → PPM
mg/L
↓
— ppm
Formula: ppm = mg/L × (1 / density)
For water (density = 1 g/mL): 1 mg/L = 1 ppm
OR
PPM → mg/L
ppm
↓
— mg/L
Formula: mg/L = ppm × density
For water (density = 1 g/mL): 1 ppm = 1 mg/L

Quick Reference: mg/L to PPM Conversion Table (Water)

mg/L (Milligrams per Liter) PPM (Parts per Million)
0.1 mg/L0.1 ppm
0.5 mg/L0.5 ppm
1.0 mg/L1.0 ppm
5.0 mg/L5.0 ppm
10.0 mg/L10.0 ppm
25.0 mg/L25.0 ppm
50.0 mg/L50.0 ppm
100.0 mg/L100.0 ppm
250.0 mg/L250.0 ppm
500.0 mg/L500.0 ppm
1,000.0 mg/L1,000.0 ppm
2,500.0 mg/L2,500.0 ppm
5,000.0 mg/L5,000.0 ppm
10,000.0 mg/L10,000.0 ppm
ⓘ For pure water and most dilute aqueous solutions, 1 mg/L = 1 ppm exactly. This equivalence holds because 1 litre of water has a mass of approximately 1 kg (1,000,000 mg), making milligrams per litre numerically equal to milligrams per kilogram (ppm by mass).
mg/L to PPM Conversion Calculator