Purdue Bioscience's Molarity Calculator is based on the following equation:

Purdue Bioscience's Molarity Calculator is a useful tool that allows you to calculate the:

• The mass of compound needed to prepare a solution of known volume and concentration
• The volume of solution required to dissolve a known mass of compound to the desired concentration
• The concentration of the solution produced by a known mass of compound in a specific volume

An example of a molarity calculation using the Purdue Bioscience's Molarity Calculator

• 1.Enter 200 into the Molecular Weight box
• 2.Enter 20 into the Concentration box and select the correct unit (millimolar)
• 3.Enter 20 into the Volume box and select the correct unit (milliliter)
• 4.Press Calculate button
• 5.The answer of 80 mg appears in the Mass box

The Purdue Bioscience's Dilution Calculator is based on the following equation:

Purdue Bioscience's Dilution Calculator is a useful tool that allows you to calculate how to dilute a stock solution of known concentration.

An example of a dilution calculation using the Purdue Bioscience's dilution calculator

What volume of a given 20 mM stock solution is required to make 10ml of a 50 μM solution? Using the equation C1*V1 = C2*V2, where C1=20 mM, C2=50 μM, V2=10 ml and V1 is the unknown:

• 1.Enter 20 into the Concentration (Start) box and select the correct unit (millimolar)
• 2.Enter 50 into the Concentration (Final) box and select the correct unit (micromolar)
• 3.Enter 10 into the Volume (Final) box and select the correct unit (milliliter)
• 4.Press Calculate button
• 5.The answer of 25 microliter (0.025 ml) appears in the Volume (Start) box

Calculate the volume of solvent required to reconstitute your vial.

The Purdue Bioscience's Reconstitution Calculator allows you to quickly calculate the volume of reagents in a reconstituted vial. Enter the mass of the reagent and the target concentration, and the calculator will determine the rest.

Enter the chemical formula of a compound to calculate its molar mass and elemental composition

Tip: Chemical formula is case sensitive: C6H8O2 c6h8o2

Instructions for calculating the molar mass (molecular weight) of a compound.
To calculate the molar mass of a compound, enter its chemical formula and click on "Calculate".
Definitions of molecular mass, molecular weight, molar mass and molar weight.
The molecular mass (molecular weight) is the mass of one molecule of a substance, expressed in a unified atomic mass unit (u). (1u is equal to 1/12 of the mass of one carbon-12 atom).
Molar mass (molar weight) is the mass of one mole of a substance, expressed in g/mol.