Enter your solution's percentage concentration (w/w, w/v, or v/v), molar mass, and density, and this Percentage Concentration to Molarity Calculator converts it to molarity (mol/L) — showing you the exact formula used and rounding to sensible significant figures so your result is lab-ready.
Molarity
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Concentration Type
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Formula Used
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w/w % is grams of solute per 100 grams of solution, w/v % is grams of solute per 100 mL of solution, and v/v % is milliliters of solute per 100 mL of solution. Each requires different formulas for molarity conversion.
For w/v percentages, density is not needed. For w/w percentages, you need the solution density. For v/v percentages, you need the solute density to convert volume to mass.
The formula depends on the percentage type: w/v uses M = (% × 10) / Molar Mass, w/w uses M = (% × density × 10) / Molar Mass, and v/v uses M = (% × solute density × 10) / Molar Mass. The factor 10 converts per 100 mL to per liter.
Enter molar mass in g/mol and density in g/mL. The calculator will automatically handle the unit conversions to give molarity in mol/L (M).
The factor 10 converts the concentration from 'per 100 mL' (percentage basis) to 'per liter' (molarity basis), since 1 liter = 1000 mL and 1000/100 = 10.
Yes, the calculator works for any concentration from 0.001% to 100%. However, very high concentrations may require accurate density values for precise results.
When enabled, the result is rounded to a sensible number of significant figures based on the precision of your input values, following standard scientific notation practices.