Mass concentration.
Milligrams per Gallon to Parts per billion water Converter — mg/gal to ppb
Convert Milligram per Gallon (mg/gal) to Parts per billion water (ppb) using the exact conversion factor (1 milligram per gallon = 264.1720524 parts per billion water). See the formula, worked examples, and conversion table.
Milligrams per Gallon 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 0.0002641720524 / 1e-6.
Mass Concentration units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Milligrams per Gallon to Parts per billion water
Milligram per Gallon 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: Mass concentration, and approximate ug/L in water.
Formula
parts per billion water = milligrams per gallon × 264.172052358
This factor comes from each unit's defined relationship to the category's base unit: 1 milligram per gallon equals 0.000264172052358 base units, and 1 parts per billion water equals 0.000001 base units, so dividing one by the other gives the direct milligram per gallon-to-parts per billion water factor of 264.172052358.
Simple example
1 mg/gal × 264.1720524 = 264.1720524 ppb
1 milligram per gallon = 264.1720524 parts per billion water.
Real-world example
100 mg/gal × 264.1720524 = 26,417.20524 ppb
100 milligrams per gallon = 26,417.20524 parts per billion water.
Conversion table
| Milligram per Gallon (mg/gal) | Parts per billion water (ppb) |
|---|---|
| 0.001 mg/gal | 0.2641720524 ppb |
| 0.01 mg/gal | 2.641720524 ppb |
| 0.1 mg/gal | 26.41720524 ppb |
| 1 mg/gal | 264.1720524 ppb |
| 10 mg/gal | 2,641.720524 ppb |
| 100 mg/gal | 26,417.20524 ppb |
Reverse conversion: Parts per billion water to Milligram per Gallon
264.1720524 ppb × 0.003785411784 = 1 mg/gal
264.1720524 parts per billion water = 1 milligrams per gallon.
milligrams per gallon = parts per billion water × 0.003785411784
For a page dedicated to this direction, see Parts per billion water to Milligram per Gallon.
Understanding the Milligram per Gallon (mg/gal)
Mass concentration.
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 milligram per gallon?
1 milligram per gallon equals 264.1720524 parts per billion water, using the exact defined conversion factor rather than an estimate.
How do I convert milligram per gallon to parts per billion water?
Multiply the milligram per gallon value by 264.1720524. The converter above does this instantly to whatever precision you set.
How do I convert parts per billion water back to milligram per gallon?
Use the reverse factor: 1 parts per billion water equals 0.0037854118 milligrams per gallon. You can also use the swap control in the converter above to flip the direction instantly.
What is a milligram per gallon?
Milligram per Gallon (mg/gal) is a unit of chemistry.
What is a parts per billion water?
Parts per billion water (ppb) is a unit of chemistry.
Is the milligram per gallon to parts per billion water conversion exact?
Yes. Both milligram per gallon and parts per billion water are defined by fixed standards rather than physical artifacts, so the factor of 264.1720524 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.