Which protein concentration units are supported?

The converter supports mg/mL, µg/mL, g/L, % w/v, µM, nM, mM, and pmol/µL.

Why is molecular weight required?

Molecular weight is needed to convert between mass-based units and molar units such as µM, nM, and mM.

What formula converts mg/mL to µM?

For a protein, µM = mg/mL × 1000 ÷ molecular weight in kDa.

How are % w/v and mg/mL related?

For aqueous concentration notation, 1% w/v equals 10 mg/mL, or 1 g/L.

Is this tool intended for clinical or diagnostic decisions?

No. It is provided for educational use and experiment planning, not clinical or diagnostic decisions.

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Protein Concentration Converter (mg/mL ↔ µM ↔ %)

One-step protein unit conversion across mg/mL, µg/mL, g/L, % w/v, µM, nM, mM, and pmol/µL via molecular weight, with bench landmarks. Educational use only.

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2 examples

BSA stock 10 mg/mL (66.4 kDa) → 150.6 µM, 1% w/v, 150.6 pmol/µL

A 10 mg/mL BSA stock (monomer 66.4 kDa) is 10 × 1000 ÷ 66.4 = 150.6 µM, exactly 1% (w/v), and — via the 1 µM = 1 pmol/µL identity — 150.6 pmol/µL. Those are the numbers you need when a protocol asks for BSA in µM but the bottle says mg/mL.

{"result":"10 mg/mL = 1 g/L = 10000 µg/mL = 1 % w/v = 150.6024 µM = 0.1506 mM = 150602.4096 nM = 150.6024 pmol/µL.","metadata":{"result":{"mgPerMl":10,"percentWV":1,"uM":150.6024,"pmolPerUl":150.6024}}}

50 kDa protein at 100 µM → 5 mg/mL, 0.5% w/v, 100 pmol/µL

Kinase assays are usually written in µM, but you measure stock in mg/mL. A 50 kDa protein at 100 µM converts to 100 × 50 ÷ 1000 = 5 mg/mL (0.5% w/v); the same sample is 100 pmol/µL, so a 10 µL reaction pipettes a clean 1 nmol of enzyme. Handy identity: µM and pmol/µL are always the same number.

{"result":"100 µM = 0.1 mM = 100000 nM = 5 mg/mL = 5000 µg/mL = 0.5 % w/v = 100 pmol/µL.","metadata":{"result":{"uM":100,"mgPerMl":5,"percentWV":0.5,"pmolPerUl":100}}}

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4 options

SettingsAdjust formats, ranges, numbers, and modes.4

Protein ConcentrationnumberRequiredValue in the unit selected below.Concentration UnitselectRequiredUnit of the entered value.Molecular Weight (kDa)numberRequiredProtein molecular weight (monomer) in kDa — drives mass ↔ molar conversions.Decimal PlacesnumberOptional

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Protein Concentration Converter (mg/mL ↔ µM ↔ %)

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Examples

1. Convert a BSA stock to molar units

2. Convert a 50 kDa protein target from µM to mass concentration

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3. Check a percent w/v protein solution