Mass concentration.
Micrograms per Gallon to Parts per million water Converter — ug/gal to ppm
Convert Microgram per Gallon (ug/gal) to Parts per million water (ppm) using the exact conversion factor (1 microgram per gallon = 0.0002641721 parts per million water). See the formula, worked examples, and conversion table.
Micrograms per Gallon 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 2.64172052e-7 / 0.001.
Mass Concentration units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Micrograms per Gallon to Parts per million water
Microgram per Gallon 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: Mass concentration, and approximate mg/L in water.
Formula
parts per million water = micrograms per gallon × 0.000264172052358
This factor comes from each unit's defined relationship to the category's base unit: 1 microgram per gallon equals 2.641721e-7 base units, and 1 parts per million water equals 0.001 base units, so dividing one by the other gives the direct microgram per gallon-to-parts per million water factor of 0.000264172052358.
Simple example
1 ug/gal × 0.0002641720524 = 0.0002641721 ppm
1 microgram per gallon = 0.0002641721 parts per million water.
Real-world example
100 ug/gal × 0.0002641720524 = 0.0264172052 ppm
100 micrograms per gallon = 0.0264172052 parts per million water.
Conversion table
| Microgram per Gallon (ug/gal) | Parts per million water (ppm) |
|---|---|
| 0.001 ug/gal | 2.641721e-7 ppm |
| 0.01 ug/gal | 0.0000026417 ppm |
| 0.1 ug/gal | 0.0000264172 ppm |
| 1 ug/gal | 0.0002641721 ppm |
| 10 ug/gal | 0.0026417205 ppm |
| 100 ug/gal | 0.0264172052 ppm |
Reverse conversion: Parts per million water to Microgram per Gallon
0.0002641721 ppm × 3785.411784 = 1.00000018 ug/gal
0.0002641721 parts per million water = 1.00000018 micrograms per gallon.
micrograms per gallon = parts per million water × 3785.411784
For a page dedicated to this direction, see Parts per million water to Microgram per Gallon.
Understanding the Microgram per Gallon (ug/gal)
Mass concentration.
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 microgram per gallon?
1 microgram per gallon equals 0.0002641721 parts per million water, using the exact defined conversion factor rather than an estimate.
How do I convert microgram per gallon to parts per million water?
Multiply the microgram per gallon value by 0.0002641720524. The converter above does this instantly to whatever precision you set.
How do I convert parts per million water back to microgram per gallon?
Use the reverse factor: 1 parts per million water equals 3,785.411784 micrograms per gallon. You can also use the swap control in the converter above to flip the direction instantly.
What is a microgram per gallon?
Microgram per Gallon (ug/gal) is a unit of chemistry.
What is a parts per million water?
Parts per million water (ppm) is a unit of chemistry.
Is the microgram per gallon to parts per million water conversion exact?
Yes. Both microgram per gallon and parts per million water are defined by fixed standards rather than physical artifacts, so the factor of 0.0002641720524 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.