Determine the mass, volume, or concentration needed to prepare a solution.
Enter 3 values to calculate the:
- Mass required OR
- Volume of solvent required OR
- Concentration of a resulting solution
Molecular weight is a required field.
Molarity Calculator
How to use this calculator
This calculator is based on the following equation:
Mass (g) = concentration (mol/L) x Volume (L) x Molecular Weight (g/mol)
You can use the calculator to solve for unknown mass, volume, or concentration based on other known variables. Leave the value you want blank. The molecular weight of the compound must be known.
Examples:
What is the mass of compound needed to make 1 mL of a 10 mM solution for a compound of MW 950?
- Enter 950 for molecular weight (g/mol)
- Enter 1 in the volume box and select milliliter from the dropdown list
- Enter 10 in the concentration box and select millmolar from the dropdown list
- Leave the mass box blank and do not select any units (the units will be automatically filled in by the calculator)
- Click Calculate
Answer: 9.5 mg
What is the volume of water needed to dissolve 25 mg of compound at 1 mM concentration, for a compound of MW 1250?
- Enter 1250 for molecular weight (g/mol)
- Enter 1 in the concentration box and select millimolar from the dropdown list
- Enter 25 in the mass box and select milligrams from the dropdown list
- Leave the volume box blank and do not select any units (the units will be automatically selected by the calculator)
- Click Calculate
Answer: 20 mL