Protein Molecular Weight

Created By : Vinay Kumar Prajapati

Reviewed By : Rajashekhar Valipishetty

Last Updated : May 05, 2025

Our online protein Molecular weight calculator is the best tool that computes the molecular weight of protein easily in microseconds. For that, what you need to do is, give the inputs in the allocated input boxes and then click on the calculate button that gives you the answer instantaneously.

Protein Molecular Weight Calculator: Are you a student and feeling difficult to calculate your protein weight? Then, you came to the right place as we have provided you with the protein MW calculator tool that calculates the protein weight easily. And also we have provided you with complete information about the concept like definition, formulas, and steps on how to calculate the molecular weight of protein manually. Read on to know!!

What is Protein Molecular Weight

Protein molecular weight is the sum of all protein amino acids molecular weight. The units of this protein MW are kDa(kilo Daltons) and u (unified atomic mass unit). The relation between kDa and u is 1u = 1Da where 1Da = 0.01kDa

Protein Molecular Weight Formula

We are going to provide you with the formula to calculate the protein molecular weight.

Protein MW = Aminoacid MW *1 +... Aminoacid MW *n -(18.0153 x (n-1))

where,

n = Total no.of used amino acids.

The average molecular weight of amino acids is 0.11kDa.

How do you Calculate the Protein Molecular Weight?

Here we are going to provide you with the simple steps to calculate the protein molecular weight easily by hand.

  • Initially, take the names of amino acids from the problem.
  • Know the molecular weight of those amino acids.
  • Then, apply the formula of protein molecular weight.
  • Substitute the values in the formula and then simplify it.
  • At last, get the protein molecular weight.

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FAQs of Protein Molecular Weight Calculator

1. How to use the protein MW calculator?

Look into the steps given below to use the protein molecular weight calculator.

  • Firstly, provide the inputs in the input fields.
  • Then, click the calculate button.
  • And then, finally, get the answer easily.

2. How to calculate the molecular weight of the protein?

To calculate the molecular weight of protein multiplies the average molecular weight of amino acids by the total number of amino acids present in the protein.

3. Why is the molecular weight of protein calculated?

The molecular weight of the protein is measured to identify the unknown proteins.