About Molarity Calculator
Molarity is the concentration chemists use most: moles of solute per liter of solution. It links a weighed mass to a volume, which is why it appears in titration calculations, buffer recipes and reaction yields. The arithmetic is simple, but unit slips between milliliters and liters are the usual reason an answer comes out a thousand times too large or too small.
This calculator works in both directions. Enter moles and volume to get molarity, or mass, molar mass and volume to go through moles first; the third mode turns a known molarity and volume back into moles. Every answer shows the formula, the converted volume in liters and the intermediate amount, so the result can be checked line by line.
What this tool does
Three calculation paths
Start from moles, from a weighed mass with its molar mass, or from a concentration and volume to find how many moles are present.
Liters and milliliters
Enter the volume in either unit; the calculator converts it to liters before dividing and shows the conversion in the working.
Mass route via molar mass
The mass mode divides grams by grams per mole to get moles first, and the intermediate value is displayed in the steps.
Formula and intermediate values
Each result shows M = n / V or n = M × V with the actual numbers substituted, so the arithmetic can be checked by hand.
Clear range errors
Empty fields, non-numeric text, zero volumes and negative masses produce field-level messages rather than a silent wrong answer.
Local browser arithmetic
The calculation runs in the page with no upload and no network request, which keeps lab data and coursework private.
How to use Molarity Calculator
- 01
Choose what you know
Pick the mode that matches the values you have: moles and volume, mass and molar mass with volume, or molarity and volume.
- 02
Enter the amounts
Fill in the visible fields using grams, moles and the solution volume, and pick liters or milliliters for the volume.
- 03
Check the conversion
The working shows the volume converted to liters, which is the unit the molarity formula expects.
- 04
Read the result
The headline gives molarity in mol/L or moles in mol, with the other quantities repeated in the summary grid.
- 05
Reset for another solution
Press Reset to clear all fields and units, then enter the next set of values.
How this tool works
- Works with
- MOLES → MOLARITY
- Processing
- Client-side, in your browser. Nothing is uploaded.
- Requirements
- Chrome, Edge, Firefox or Safari · JavaScript enabled
Limitations worth knowing
- Assumes the volume entered is the final solution volume and that the solute is fully dissolved.
- No temperature correction: molarity depends on solution volume, which changes with temperature.
- Ideal-solution arithmetic only; activity coefficients and non-ideal behavior at high concentrations are ignored.
Privacy and file handling
The amounts you enter are used only for the arithmetic in this browser tab. Nothing is uploaded, stored or logged, and no network request is made by the calculator.
Read the full privacy policy