Mass concentration.
Grams per Gallon to Parts per million water Converter — g/gal to ppm
Convert Gram per Gallon (g/gal) to Parts per million water (ppm) using the exact conversion factor (1 gram per gallon = 264.1720524 parts per million water). See the formula, worked examples, and conversion table.
Grams 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 0.2641720524 / 0.001.
Mass Concentration units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Grams per Gallon to Parts per million water
Gram 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 = grams per gallon × 264.172052358
This factor comes from each unit's defined relationship to the category's base unit: 1 gram per gallon equals 0.264172052358 base units, and 1 parts per million water equals 0.001 base units, so dividing one by the other gives the direct gram per gallon-to-parts per million water factor of 264.172052358.
Simple example
1 g/gal × 264.1720524 = 264.1720524 ppm
1 gram per gallon = 264.1720524 parts per million water.
Real-world example
100 g/gal × 264.1720524 = 26,417.20524 ppm
100 grams per gallon = 26,417.20524 parts per million water.
Conversion table
| Gram per Gallon (g/gal) | Parts per million water (ppm) |
|---|---|
| 0.001 g/gal | 0.2641720524 ppm |
| 0.01 g/gal | 2.641720524 ppm |
| 0.1 g/gal | 26.41720524 ppm |
| 1 g/gal | 264.1720524 ppm |
| 10 g/gal | 2,641.720524 ppm |
| 100 g/gal | 26,417.20524 ppm |
Reverse conversion: Parts per million water to Gram per Gallon
264.1720524 ppm × 0.003785411784 = 1 g/gal
264.1720524 parts per million water = 1 grams per gallon.
grams per gallon = parts per million water × 0.003785411784
For a page dedicated to this direction, see Parts per million water to Gram per Gallon.
Understanding the Gram per Gallon (g/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 gram per gallon?
1 gram per gallon equals 264.1720524 parts per million water, using the exact defined conversion factor rather than an estimate.
How do I convert gram per gallon to parts per million water?
Multiply the gram per gallon value by 264.1720524. The converter above does this instantly to whatever precision you set.
How do I convert parts per million water back to gram per gallon?
Use the reverse factor: 1 parts per million water equals 0.0037854118 grams per gallon. You can also use the swap control in the converter above to flip the direction instantly.
What is a gram per gallon?
Gram per Gallon (g/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 gram per gallon to parts per million water conversion exact?
Yes. Both gram per gallon and parts per million 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.