Approximate ug/L in water.
Parts per billion water to Parts per million water Converter — ppb to ppm
Convert Parts per billion water (ppb) to Parts per million water (ppm) using the exact conversion factor (1 parts per billion water = 0.001 parts per million water). See the formula, worked examples, and conversion table.
Parts per billion water to Parts per million 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 mg/L in water.
Result = input x 1e-6 / 0.001.
Mass Concentration units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Parts per billion water to Parts per million water
Parts per billion water and Parts per million 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 ug/L in water, and approximate mg/L in water.
Formula
parts per million water = parts per billion water × 0.001
This factor comes from each unit's defined relationship to the category's base unit: 1 parts per billion water equals 0.000001 base units, and 1 parts per million water equals 0.001 base units, so dividing one by the other gives the direct parts per billion water-to-parts per million water factor of 0.001.
Simple example
1 ppb × 0.001 = 0.001 ppm
1 parts per billion water = 0.001 parts per million water.
Real-world example
100 ppb × 0.001 = 0.1 ppm
100 parts per billion water = 0.1 parts per million water.
Conversion table
| Parts per billion water (ppb) | Parts per million water (ppm) |
|---|---|
| 0.001 ppb | 0.000001 ppm |
| 0.01 ppb | 0.00001 ppm |
| 0.1 ppb | 0.0001 ppm |
| 1 ppb | 0.001 ppm |
| 10 ppb | 0.01 ppm |
| 100 ppb | 0.1 ppm |
Reverse conversion: Parts per million water to Parts per billion water
0.001 ppm × 1000 = 1 ppb
0.001 parts per million water = 1 parts per billion water.
parts per billion water = parts per million water × 1000
For a page dedicated to this direction, see Parts per million water to Parts per billion water.
Understanding the Parts per billion water (ppb)
Approximate ug/L in water.
Understanding the Parts per million water (ppm)
Approximate mg/L in water.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many parts per million water are in 1 parts per billion water?
1 parts per billion water equals 0.001 parts per million water, using the exact defined conversion factor rather than an estimate.
How do I convert parts per billion water to parts per million water?
Multiply the parts per billion water value by 0.001. The converter above does this instantly to whatever precision you set.
How do I convert parts per million water back to parts per billion water?
Use the reverse factor: 1 parts per million water equals 1,000 parts per billion water. You can also use the swap control in the converter above to flip the direction instantly.
What is a parts per billion water?
Parts per billion water (ppb) is a unit of chemistry.
What is a parts per million water?
Parts per million water (ppm) is a unit of chemistry.
Is the parts per billion water to parts per million water conversion exact?
Yes. Both parts per billion water and parts per million water are defined by fixed standards rather than physical artifacts, so the factor of 0.001 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.