Density to Molarity Calculator
Turn a concentrated reagent label (density and % w/w) into molar concentration using the solute molar mass.
g/mL
%
g/mol
Moles of solute per litre of solution
18,38
mol/LSolute
98%
Solvent
2%
- 1
Solution mass per litre
1,84 × 1,000 = 1 840Density (g/mL) × 1000 gives the total mass of one litre of solution in grams. - 2
Solute mass per litre
1 840 × 98 ÷ 100 = 1 803,2 - 3
Molarity
1 803,2 ÷ 98,08 = 18,385
Miten tämä laskin toimii?
Molarity equals density (g/mL) times 1000 times mass percent divided by 100, all divided by the solute molar mass (g/mol). This converts a labeled density and percent strength into moles of solute per litre. Concentrated sulfuric acid (1.84 g/mL, 98%, 98.08 g/mol) works out to about 18.4 mol/L.
Kaava
How this is calculated
Reagent bottles list density (g/mL) and mass percent (% w/w) rather than molarity, so a conversion is needed. Multiplying density by 1000 gives the mass of one litre of solution in grams. Multiplying that by the mass percent over 100 isolates the grams of solute contained in one litre.
Dividing the grams of solute per litre by the solute molar mass (g/mol) converts mass to moles, yielding molarity in mol/L. For example, concentrated sulfuric acid with density 1.84 g/mL, 98% w/w, and molar mass 98.08 g/mol gives (1.84 × 1000 × 0.98) / 98.08 ≈ 18.4 mol/L.
The calculation assumes density and mass percent refer to the same solution at the same temperature, and that the molar mass is for the pure solute. Density is temperature dependent, so use the value at your working temperature. Molar mass and density must both be positive; mass percent should fall between 0 and 100.
Usein kysytyt kysymykset
Density is given in grams per millilitre, but molarity is per litre. Since 1 litre = 1000 mL, multiplying by 1000 converts the density into the mass of one full litre of solution in grams.
Use the molar mass of the pure solute (the dissolved compound), not the solution. For sulfuric acid use 98.08 g/mol, for HCl gas in solution use 36.46 g/mol, and so on.
Yes. Density changes with temperature, so the resulting molarity is only accurate at the temperature where the density was measured. Use density values at your working temperature for best results.
Tunnetaan myös nimellä
TG we-Calculate Editorial Team. (2026). Density to Molarity Calculator [Online calculator]. TG we-Calculate. https://we-calculate.com/fi/calculator/density-to-molarity-calculator
TG we-Calculate Editorial Team. "Density to Molarity Calculator." TG we-Calculate. 2026. https://we-calculate.com/fi/calculator/density-to-molarity-calculator.
TG we-Calculate Editorial Team, "Density to Molarity Calculator," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/fi/calculator/density-to-molarity-calculator
@misc{wecalculate_density_to_molarity_calculator, title = {Density to Molarity Calculator}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/fi/calculator/density-to-molarity-calculator}}, year = {2026}, note = {TG we-Calculate} }
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