Parts Per Billion Calculator
Convert between parts per billion (ppb) and other ratio units — percent, ppm, and ppt.
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Enter a ratio value and choose a from/to unit to convert between ppb, ppm, percent, and ppt.
Your result
0.001
Converted value
Equivalent in water (mg/L)0.001
AI explanation
Formula
Converted value = amount × (from-unit-to-fraction factor) ÷ (to-unit-to-fraction factor)Worked example
1 ppb to ppm
| Field | Value |
|---|---|
| Amount | 1 |
| From unit | ppb |
| To unit | ppm |
| Converted value | 0.001 |
| Equivalent in water (mg/L) | 0.001 |
Assumptions
- The "equivalent in water" figure assumes a dilute aqueous solution (density ≈1000 g/L), where 1 ppb by mass is very close to 0.001 mg/L (1 µg/L) — a standard approximation in water-quality contexts, but not exact for other solvents or concentrated solutions.
Frequently asked questions
What does 1 ppb mean?
1 part per billion means 1 unit of something in a total of 1 billion units — a thousand times smaller than 1 ppm.
Where are ppb values commonly used?
Trace contaminant testing in drinking water, air quality monitoring for hazardous pollutants, and ultra-trace chemical analysis often report results in ppb.
I need parts per million instead — is there a dedicated version?
Yes — see the Parts Per Million Calculator, which uses the same conversion with ppm as the default unit.