Concentration Unit Converter
Instantly convert between mg/L, ppm, and other Concentration units — accurate, free, and built for water treatment engineering work.
Quick Reference Table
| Unit | Converted to mg/L | mg/L converted to unit |
|---|---|---|
| ppm | 1 ppm = 1 mg/L | 1 mg/L = 1 ppm |
| ppb | 1 ppb = 0.001 mg/L | 1 mg/L = 1000 ppb |
| g/L | 1 g/L = 1000 mg/L | 1 mg/L = 0.001 g/L |
| % (wt) | 1 % (wt) = 10000 mg/L | 1 mg/L = 0.0001 % (wt) |
| grains/gal (US) | 1 grains/gal (US) = 17.118 mg/L | 1 mg/L = 0.058418 grains/gal (US) |
Engineering Context
mg/L and ppm are treated as numerically equivalent here, which is the standard water-treatment convention for dilute aqueous solutions (solution density ≈ 1 kg/L) — the same assumption used on virtually every water-quality lab report and membrane data sheet. It breaks down at very high TDS (e.g. concentrated brine), where the two units diverge.
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