Biology & Life Science

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Protein Concentration Calculator.

Calculate concentration from measured protein mass and sample volume.

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Concentration: 5 mg/mL

Concentration

5.00mg/mL
Concentration: 5 g/L

Concentration

5.00g/L

How to Use

Concentration = measured mass ÷ measured sample volume. This page reports mg/mL and the numerically equivalent g/L; enter compatible units.

Use measured values and a documented convention. This calculator does not provide medical, veterinary, phenotype, or laboratory-method advice.

Use Cases

Lab Dilution Preparation

Determine the concentration of a stock protein solution to prepare accurate dilutions for assays or experiments.

Example: If you have 10 mg protein in 5 mL buffer, concentration is 2 mg/mL.

Quality Control in Protein Purification

Verify the concentration of purified protein fractions to ensure consistency and yield.

Example: Check each elution fraction's concentration to pool the most concentrated ones.

Frequently Asked Questions

How do I calculate protein concentration?
Divide the protein mass (in mg) by the sample volume (in mL). For example, 5 mg in 2 mL gives 2.5 mg/mL. This calculator does that for you.
What units does the calculator use?
The calculator uses milligrams (mg) for mass and milliliters (mL) for volume, giving concentration in mg/mL. Ensure your inputs are in these units for accurate results.
Can I use this for any protein sample?
Yes, as long as you know the total mass of protein and the volume of the solution. It works for purified proteins, lysates, or any sample where mass and volume are known.

Tips & Common Mistakes

Tips

  • Always use the same units for mass and volume to get concentration in mg/mL.
  • Measure protein mass accurately using a balance or spectrophotometric method.
  • Use a calibrated pipette for volume measurement to avoid errors.
  • For dilute samples, consider using µg/mL or ng/mL by converting units first.

Common Mistakes to Avoid

  • Mixing units, e.g., using grams with milliliters, leading to incorrect concentration.
  • Forgetting to convert volume to milliliters if measured in liters or microliters.
  • Assuming the calculator accounts for dilution factors or buffer contributions—it only uses the mass and volume you enter.

Last updated: August 13, 2026