How to use the molarity calculator
Find molarity from moles and volume. Enter moles of solute, volume of solution in the fields above; the molarity, millimolar are computed instantly and plotted on the chart so you can see how the answer changes.
Formula
Variables
- n — Moles of solute (mol)
- V — Volume of solution (L)
Worked example
With moles of solute = 0.5 mol, volume of solution = 2 L, the calculator gives molarity ≈ 0.25 mol/L; millimolar ≈ 250 mM.
Frequently asked questions
What is the formula for the molarity calculation?
Molarity (mol/L) = n / V. Millimolar (mM) = [Molarity] × 1000. Here n is moles of solute (mol), V is volume of solution (L).
What inputs do I need for the molarity calculator?
You need moles of solute in mol, volume of solution in L. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use this calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.