Molarity to Mass/Volume Calculator
Find out exactly how many grams of a solid solute you need to weigh out to make a chemical solution of a target concentration and volume.
Target Formulation
Input concentration, molecular weight, and target volume.
Required Solute Mass
* Weigh out this amount and dissolve up to target volume.
Expert Tip
When preparing buffers, adjust the pH *before* adding the remaining solvent to reach the final volume mark, as pH meters and acids/bases can alter the final volume slightly.
Methodology & Equations
Mass Calculation Formula
The required solute mass is computed by rearranging the molarity equation:
Metric Multipliers Used
Our calculator handles metric unit conversions automatically:
- Molarity (M): 1 M = 1,000 mM = 1,000,000 μM
- Volume (L): 1 L = 1,000 mL
How to Convert Molarity to Mass and Volume
Prepare chemical solutions by converting target molarity and volume back to dry mass:
Gather Initial values
Note the desired molar concentration (M), final volume (L), and molecular weight of the compound (g/mol).
Perform the Multiplication
Use the mass formula: Mass (g) = Molarity (mol/L) × Volume (L) × Molecular Weight (g/mol).
Weigh and Dilute
Weigh the calculated mass, dissolve it in a solvent, and fill up to the target volume.