How to use this calculator
- Select the concentration definition that matches your data.
- Enter the numerator and denominator on the stated basis.
- Enter density and molar mass only when the selected conversion requires them.
- Calculate and read the unit with the result.
Formula and variables
concentration = amount of solute / amount of solution
| Symbol | Meaning | Unit |
|---|---|---|
| qₛ | solute amount | mode-specific |
| q | solution amount | mode-specific |
Worked example
5 g solute in 250 mL solution is 2% m/v.
Interpretation
The displayed unit identifies the selected definition; percentages, molarity, ppm, and mass concentration are not interchangeable.
Common mistakes
- Match the numerator and denominator to the selected mode.
- Provide density before relating mass-fraction ppm to mg/L.
Frequently asked questions
Which concentration types are supported?
The tool supports molarity, mass concentration, three percent bases, ppm, ppb, and density-based conversions.
Can I convert molarity to mass percent?
Yes. Enter the solution density and solute molar mass for that conversion.
Are mass percent and mass-volume percent the same?
No. Mass percent uses solution mass. Mass-volume percent uses solution volume.
Can I use scientific notation?
Yes. Enter values such as 6.022e23 or 1.0e-6 in a numeric field.
How should I round the result?
Keep extra digits during the calculation. Round the final result to the precision required by your data.