Approximate mg/L in water.
Parts per million water to Parts per billion water Converter — ppm to ppb
Convert Parts per million water (ppm) to Parts per billion water (ppb) using the exact conversion factor (1 parts per million water = 1,000 parts per billion water). See the formula, worked examples, and conversion table.
Parts per million water to Parts per billion water converter
Converter
Chemistry Converter
Convert concentration, molarity, amount, and laboratory scientific units by compatible family.
Context values
Some unit families need one extra value for a physically accurate result.
Approximate ug/L in water.
Result = input x 0.001 / 1e-6.
Mass Concentration units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Parts per million water to Parts per billion water
Parts per million water and Parts per billion water both measure mass concentration — how much of a substance is dissolved or dispersed in a given volume — a core calculation for preparing lab solutions, checking water quality against a regulatory limit, or formulating a pharmaceutical dose. Specifically: Approximate mg/L in water, and approximate ug/L in water.
Formula
parts per billion water = parts per million water × 1000
This factor comes from each unit's defined relationship to the category's base unit: 1 parts per million water equals 0.001 base units, and 1 parts per billion water equals 0.000001 base units, so dividing one by the other gives the direct parts per million water-to-parts per billion water factor of 1000.
Simple example
1 ppm × 1000 = 1,000 ppb
1 parts per million water = 1,000 parts per billion water.
Real-world example
100 ppm × 1000 = 100,000 ppb
100 parts per million water = 100,000 parts per billion water.
Conversion table
| Parts per million water (ppm) | Parts per billion water (ppb) |
|---|---|
| 0.001 ppm | 1 ppb |
| 0.01 ppm | 10 ppb |
| 0.1 ppm | 100 ppb |
| 1 ppm | 1,000 ppb |
| 10 ppm | 10,000 ppb |
| 100 ppm | 100,000 ppb |
Reverse conversion: Parts per billion water to Parts per million water
1 ppb × 0.001 = 0.001 ppm
1 parts per billion water = 0.001 parts per million water.
parts per million water = parts per billion water × 0.001
For a page dedicated to this direction, see Parts per billion water to Parts per million water.
Understanding the Parts per million water (ppm)
Approximate mg/L in water.
Understanding the Parts per billion water (ppb)
Approximate ug/L in water.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many parts per billion water are in 1 parts per million water?
1 parts per million water equals 1,000 parts per billion water, using the exact defined conversion factor rather than an estimate.
How do I convert parts per million water to parts per billion water?
Multiply the parts per million water value by 1000. The converter above does this instantly to whatever precision you set.
How do I convert parts per billion water back to parts per million water?
Use the reverse factor: 1 parts per billion water equals 0.001 parts per million water. You can also use the swap control in the converter above to flip the direction instantly.
What is a parts per million water?
Parts per million water (ppm) is a unit of chemistry.
What is a parts per billion water?
Parts per billion water (ppb) is a unit of chemistry.
Is the parts per million water to parts per billion water conversion exact?
Yes. Both parts per million water and parts per billion water are defined by fixed standards rather than physical artifacts, so the factor of 1000 used above is exact to as many digits as you choose to display.
What's the difference between mass concentration and molarity?
Mass concentration expresses how much mass of a substance is present per unit volume (for example, grams per liter). Molarity expresses the amount in moles per liter instead, which accounts for the substance's molecular weight. This category converts mass-concentration units.