Fluids converters
Concentration - Solution Converter
Convert solution strength units: g/L, mg/L, kg/m³, percent w/v and lb/gal.
Result
1000 mg/L
1 g/L = 1000 mg/L
All units for this value
| Unit | Symbol | Value |
|---|---|---|
| Kilogram per cubic meter | kg/m³ | 1 |
| Gram per liter | g/L | 1 |
| Gram per cubic meter | g/m³ | 1000 |
| Milligram per liter | mg/L | 1000 |
| Microgram per liter | µg/L | 1000000 |
| Milligram per milliliter | mg/mL | 1 |
| Gram per milliliter | g/mL | 0.001 |
| Kilogram per liter | kg/L | 0.001 |
| Gram per 100 mL (% w/v) | g/100mL | 0.1 |
| Part per million (mg/L) | ppm | 1000 |
| Pound per cubic foot | lb/ft³ | 0.062428 |
| Pound per US gallon | lb/gal | 0.0083454 |
| Ounce per US gallon | oz/gal | 0.133526 |
| Grain per US gallon | gr/gal | 58.4178 |
About this calculator
Solution concentration by mass describes how much dissolved substance is packed into a given volume of liquid, expressed as units like grams per liter, milligrams per liter, or percent weight per volume. This converter switches between metric mass-per-volume units, percent and part-per-million notations, and the pound- and ounce-based units used in US industrial mixing.
How it works in plain English
The converter anchors every unit to kilograms per cubic meter, which is numerically identical to grams per liter, so entering a value in one unit rescales it into that shared base before converting to whatever target unit you pick. Metric units like milligrams per liter and micrograms per liter simply move the decimal point by factors of 1000, while kilograms per liter and grams per milliliter both equal 1000 times the base unit since a liter is one-thousandth of a cubic meter.
Percent weight per volume, written here as grams per 100 mL, and parts per million are common shorthand notations in chemistry and water treatment; a percent w/v of 1% equals 10 g/L, and 1 ppm equals 1 mg/L for a dilute aqueous solution where the solution's density is close to that of water. The US units divide a pound (0.45359237 kg) or ounce (0.028349523125 kg) by a US gallon (0.003785411784 m³), and grains per gallon divides a grain (6.479891e-5 kg) the same way, all figures still used in water hardness and agricultural chemical labeling.
Pick a from and to unit, type a value, and the converted concentration appears immediately, alongside a full table listing that same strength across every supported unit. A precision control adjusts the number of decimal places shown, and a swap button reverses the two selected units in a single click.
The formula
- value_in_target = value_in_source × (source factor to kg/m³) ÷ (target factor to kg/m³)
- 1 g/L = 1 kg/m³ = 1000 mg/L
- 1% w/v = 1 g/100mL = 10 g/L = 10 kg/m³
- 1 lb/gal(US) = 0.45359237 ÷ 0.003785411784 = 119.826 kg/m³
Worked example
Suppose a water-treatment worksheet reports a chlorine dose of 2 mg/L and needs that figure converted to parts per million for a regulatory form. Since 1 ppm equals 1 mg/L for a dilute aqueous solution, 2 mg/L converts directly to 2 ppm without any scaling.
Entering 2 into the mg/L field with ppm selected as the target returns 2 ppm immediately. As an extra step, dividing 2 mg/L by 1000 gives 0.002 g/L, which is the same shared-base figure the converter uses internally when moving between any two units on this page.
The accompanying unit table also shows this same concentration as 0.002 g/L, 0.0002% w/v, and about 0.0000167 lb/gal(US), all generated from that single entered value without further calculation. Scanning that table lets the worker confirm the mg/L, g/L, and percent w/v rows all describe the same dilute chlorine dose at different familiar scales.
Typical solution concentration figures
| Concentration | Equivalent |
|---|---|
| 1 ppm | 1 mg/L |
| 1% w/v | 10 g/L |
| Seawater salinity (typical) | ~35 g/L |
| Drinking water hardness limit (soft) | <60 mg/L as CaCO₃ |
| 1 lb/gal(US) | 119.826 kg/m³ |
| 1 gr/gal(US) | 17.118 mg/L |
Common water-treatment and chemistry reference values
Frequently asked questions
Why are g/L and kg/m³ the same number?
A liter is exactly one-thousandth of a cubic meter, and a gram is one-thousandth of a kilogram, so the two thousandths cancel out. Dissolving one gram of a substance into one liter of solution is the same concentration as dissolving one kilogram into one cubic meter, which is why the converter treats these two units as numerically identical.
Is 1 ppm always exactly 1 mg/L?
That equivalence holds closely for dilute aqueous solutions because water's density is very close to 1 kg/L, so a milligram of solute per liter of solution works out to about one part per million by mass. For solutions with noticeably different densities, such as concentrated brines or non-aqueous liquids, the exact ppm figure would differ slightly from the mg/L figure.
What does percent weight per volume mean?
Percent w/v expresses how many grams of a substance are dissolved in every 100 milliliters of solution, so a 5% w/v solution contains 5 grams per 100 mL. This converter treats that percent notation as equal to grams per 100 mL, which scales up to 10 grams per liter for each percentage point.
Why does this converter include grains per gallon?
Grains per gallon is a traditional US unit for reporting water hardness and small dissolved-mineral concentrations, where a grain is a very small mass unit historically tied to grain weights. It's included alongside metric units so that older US water-quality reports can be compared directly against modern mg/L or ppm figures.
How do I convert a lb/gal figure from a mixing chart into metric units?
Select lb/gal(US) as the from unit and g/L, kg/m³, or mg/L as the target, then enter the figure from the mixing chart. The converter applies the exact pound-to-kilogram and gallon-to-cubic-meter factors automatically, removing the need to look up or multiply those constants by hand.
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