Solution Concentration Calculator
Find concentration in grams per liter.
Results update as you type.
How it works
Mass concentration expresses how much of a substance is dissolved in a given volume of solution, and this calculator computes it in grams per liter. You enter the mass of the solute and the total volume of the solution, and it returns the concentration in grams per liter and grams per milliliter. The calculation is simply the mass divided by the volume. This measure, sometimes called mass concentration or titer, is convenient because it does not require knowing the substance's molar mass — you just need a mass and a volume, both easy to measure. It is widely used in biology, medicine, and everyday lab work, for example stating that a saline solution contains 9 grams of salt per liter, or that a stock reagent is 25 grams per liter. It differs from molarity, which expresses concentration in moles per liter and is preferred for chemical reactions because it counts particles; to convert mass concentration to molarity, divide by the molar mass. Note that the volume is the total solution volume, not the volume of solvent added, since dissolving a solute can slightly change the volume. Enter the solute mass and solution volume to find the concentration.
Concentration = mass of solute ÷ volume of solution
Mass concentration is the mass of dissolved solute divided by the total volume of the solution, giving grams per liter. Dividing by 1000 converts to grams per milliliter. Unlike molarity, this expresses concentration by weight per volume without needing the substance's molar mass.
Source:Solution chemistry
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Worked example
How to use this calculator
- 1
Enter your values
Enter mass of solute and solution volume.
- 2
Adjust the options
Fine-tune any options to match your situation.
- 3
Read your result
Concentration updates instantly as you type — no button to press.
Frequently asked questions
How do you calculate solution concentration in g/L?
Divide the mass of the dissolved solute in grams by the total volume of the solution in liters. For example, 25 grams dissolved to make 0.5 liters of solution gives a concentration of 50 grams per liter. The calculator also converts to grams per milliliter by dividing by 1000, useful for small volumes.
How is mass concentration different from molarity?
Mass concentration measures grams of solute per liter of solution, while molarity measures moles per liter. Mass concentration is easier because it needs only a mass and a volume, but molarity is preferred for reactions since it counts particles. To convert mass concentration to molarity, divide the grams per liter by the substance's molar mass.
Should I use solution volume or solvent volume?
Use the total volume of the final solution, not the volume of solvent you started with. Dissolving a solute can change the total volume slightly, so concentration is defined per liter of solution. In practice, this means dissolving the solute and then adding solvent up to the target final volume, as done with a volumetric flask.
Where is g/L concentration used?
Grams per liter is common in biology, medicine, food science, and general lab work where molar mass is unknown or unnecessary. Examples include the salt content of saline, the strength of a stock reagent, sugar in a beverage, or a nutrient in a growth medium. Its simplicity makes it convenient whenever a weight-per-volume figure suffices.
How do I convert g/L to molarity?
Divide the concentration in grams per liter by the molar mass of the substance in grams per mole to get moles per liter, which is molarity. For example, 58.5 grams per liter of sodium chloride, with a molar mass of about 58.5 grams per mole, is 1 molar. This links mass concentration to the mole-based measure used in reactions.