Protein Weight-Molar Converter

Convert between protein weight (mass) and molar quantities using molecular weight. Essential for protein quantification and solution preparation.

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Moles = Weight (g) ÷ Molecular Weight (g/mol)
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Weight (g) = Moles × Molecular Weight (g/mol)
↔
Molar Conc. (M) = Weight Conc. (g/L) ÷ MW (g/mol)

What is Protein Weight-Molar Conversion?

Converting between protein mass (weight) and molar quantities using molecular weight. Essential for protein quantification, enzyme kinetics, and stoichiometric calculations.

How to Use This Calculator

  1. Enter protein molecular weight (Da or g/mol)
  2. Input weight or molar quantity
  3. Select appropriate units
  4. Get instant conversion results

When to Use

  • Preparing protein solutions
  • Enzyme activity calculations
  • Protein-ligand binding studies
  • Western blot quantification

Common Protein MWs

Insulin: 5.8 kDa

Myoglobin: 17 kDa

GFP: 27 kDa

Actin: 42 kDa

Tubulin: 55 kDa

Unit Conversions

1 Da = 1 g/mol

1 kDa = 1000 g/mol

1 mg/mL = 1 g/L

1 µg/µL = 1 mg/mL

FAQ

Q: What's the difference between Da and g/mol?
A: They are equivalent. 1 Dalton (Da) = 1 g/mol.

Q: How do I find my protein's MW?
A: Check UniProt, use ExPASy ProtParam, or calculate from amino acid sequence.