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⚖️ Concentration Converter
Convert between mg/mL, μg/mL, ng/mL, molarity (mol/L), mmol/L and % w/v. Click any result to copy it.
g/mol
Not needed if converting between mass/volume units only (e.g. mg/mL ↔ μg/mL ↔ % w/v)
💡 Note: Converting between mass-based units (mg/mL, μg/mL, % w/v) does not require molecular weight. Converting to/from molar units (mol/L, mmol/L) requires the molecular weight of your compound.
⚠️ Verify before use: Double-check critical concentration conversions independently before use in experiments, especially when molecular weight is involved.
📖 Example: Converting 5 mg/mL BSA (MW 66,430 g/mol) to µmol/L: enter 5 mg/mL, MW = 66,430 → result = 75.3 µmol/L. Useful when a protocol specifies molar concentration but your stock is weighed gravimetrically.
7 units
mg/mL, μg/mL, ng/mL, mol/L, mmol/L, μmol/L and % w/v all in one place.
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✔ Formulas last verified against primary references: March 2025 · Report an error
Converting concentration units in pharmaceutical and biological labs
Concentration unit conversion is required when protocols from different sources use different systems. To convert mg/mL to mol/L: divide by MW (g/mol) and multiply by 1000. To convert mol/L to µmol/L: multiply by 10⁶. % w/v = g per 100 mL = 10 mg/mL. Note that % v/v (e.g. 70% ethanol) is not the same as % w/v — ethanol volumes do not add linearly to water. Always state the molecular weight used for molar conversions in your methods section.