How to use Concentration Converter
- Enter a concentration and its units.
- Provide molar mass or solution density only when the selected conversion requires it.
- Calculate and review the assumptions alongside the result.
Example: Concentration Converter
1000 mg/L to g/L
Options
- Molar mass
- Enter g/mol only when crossing between amount concentration and a mass-based quantity. Use the actual substance or the explicitly defined mixture basis.
- Solution density
- Enter g/mL when crossing between mass fraction and concentration per volume. The tool does not assume every solution has water density.
Supported inputs and limits
Where your input is processed
This tool processes your input in this browser. Your text and files are not uploaded to UseFreeTools. Check this tool's limits for anything it may save on your device.
A prefix change needs fewer assumptions
Converting 1000 mg/L to 1 g/L changes only the mass prefix. No molar mass or density is required because both units describe mass per volume. Cross-quantity conversions need the supplied material assumptions shown in the result.
Percent and ppm need an explicit basis
Mass fraction, mass per volume and amount concentration are distinct. The selected labels state which basis is used. Do not apply a result to medication dosing or infer a solution composition from a vague ppm label; obtain the actual source definition first.
Questions about Concentration Converter
Is ppm always equal to mg/L?
No. This tool’s ppm is mass fraction; converting to mg/L requires solution density.
When do I need molar mass?
When crossing between amount concentration and a mass-based quantity.
Which density should I enter?
Use the solution or mixture density at the relevant conditions, not an assumed pure-water value.