Is ng/mL the same as µg/L?

Yes, they are numerically identical. So are µg/mL and mg/L. Only the prefix convention differs.

How do you convert mass concentration to molar?

Divide the mass concentration in mg/L by the molar mass in g/mol and multiply by 1000 to get µmol/L. The molar mass must match the exact form being reported.

Nyayik VigyanForensic · Crime · Justice

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Forensic Toxicology · Tools

Concentration Unit Converter

Convert between mg/L, µg/mL, ng/mL, mg/dL and molar units using molar mass.

µmol/L = (mg/L × 1000) ÷ molar mass

Mass and molar concentration

Value

From unit

To unit

Molar mass (g/mol)

Needed only when converting between mass and molar units. Morphine 285.34, codeine 299.36, diazepam 284.74, ethanol 46.07, THC 314.46.

Converted value

0.329652umol/L

100 ng/mL = 0.100000 mg/L = 0.329652 umol/L

In mg/L (µg/mL): 0.100000
In ng/mL (µg/L): 100.000
In mg/dL: 0.010000
In µmol/L: 0.3297

µg/mL and mg/L are numerically identical, as are ng/mL and µg/L. Molar conversions depend entirely on the molar mass entered, so check it against the exact salt or free-base form being reported.

Reporting units differ between laboratories and between jurisdictions, and a mis-set molar mass produces a plausible but wrong number. Always confirm whether a result refers to the free base or a salt, and whether the matrix is whole blood, plasma or serum, since concentrations differ between them.

How the concentration unit converter works

Toxicology results are reported in different units by different laboratories and jurisdictions, and comparing them requires care. Some pairs are numerically identical: µg/mL equals mg/L, and ng/mL equals µg/L.

Mass-to-molar conversion needs the molar mass of the specific compound, and whether the result refers to the free base or a salt changes that figure. Getting it wrong produces a plausible but incorrect number.

Frequently asked questions

Is ng/mL the same as µg/L?: Yes, they are numerically identical. So are µg/mL and mg/L. Only the prefix convention differs.
How do you convert mass concentration to molar?: Divide the mass concentration in mg/L by the molar mass in g/mol and multiply by 1000 to get µmol/L. The molar mass must match the exact form being reported.

Calibrating

Preparing the instrument, please wait…

Forensic Toxicology · Tools

Concentration Unit Converter

Convert between mg/L, µg/mL, ng/mL, mg/dL and molar units using molar mass.

µmol/L = (mg/L × 1000) ÷ molar mass

Mass and molar concentration

Value

From unit

To unit

Molar mass (g/mol)

Needed only when converting between mass and molar units. Morphine 285.34, codeine 299.36, diazepam 284.74, ethanol 46.07, THC 314.46.

Converted value

0.329652umol/L

100 ng/mL = 0.100000 mg/L = 0.329652 umol/L

In mg/L (µg/mL): 0.100000
In ng/mL (µg/L): 100.000
In mg/dL: 0.010000
In µmol/L: 0.3297

µg/mL and mg/L are numerically identical, as are ng/mL and µg/L. Molar conversions depend entirely on the molar mass entered, so check it against the exact salt or free-base form being reported.

How the concentration unit converter works

Frequently asked questions

Is ng/mL the same as µg/L?: Yes, they are numerically identical. So are µg/mL and mg/L. Only the prefix convention differs.
How do you convert mass concentration to molar?: Divide the mass concentration in mg/L by the molar mass in g/mol and multiply by 1000 to get µmol/L. The molar mass must match the exact form being reported.

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Concentration Unit Converter

How the concentration unit converter works

Frequently asked questions

Other forensic tools

Calibrating

Concentration Unit Converter

How the concentration unit converter works

Frequently asked questions

Other forensic tools