Dna Weight Calculator


The DNA Weight Calculator is a handy tool for scientists and researchers to determine the molecular weight of a given DNA sequence. DNA, the building block of life, is composed of four nucleotide bases: Adenine (A), Thymine (T), Guanine (G), and Cytosine (C). Each of these bases has a specific molecular weight. This calculator simplifies the process of calculating the combined weight of these bases in a given DNA sequence.


The molecular weight of a DNA sequence is calculated by summing the individual weights of its constituent bases. The weights of the four bases are as follows:

  • Adenine (A): 313.21 g/mol
  • Thymine (T): 304.2 g/mol
  • Guanine (G): 329.21 g/mol
  • Cytosine (C): 289.18 g/mol

To calculate the weight of a DNA sequence, you add up the weights of all the bases within that sequence.

How to Use

Using the DNA Weight Calculator is simple:

  1. Enter the DNA sequence in the input field. Use only capital letters (e.g., ATGC).
  2. Click the "Calculate" button.
  3. The calculator will display the molecular weight of the entered DNA sequence in grams per mole (g/mol).


Let's say you have a DNA sequence: ATGCGTAC. Using the calculator, you can find its molecular weight:

  • A: 313.21 g/mol
  • T: 304.2 g/mol
  • G: 329.21 g/mol
  • C: 289.18 g/mol

Total weight = 313.21 + 304.2 + 329.21 + 289.18 + 329.21 + 289.18 + 304.2 + 313.21 = 2451.59 g/mol

The calculator will display: "Result: 2451.59 g/mol."


  1. What is the molecular weight of DNA? The molecular weight of DNA varies depending on its sequence. Use our DNA Weight Calculator to find the exact weight.
  2. Can I use lowercase letters in the input sequence? No, please use uppercase letters (A, T, G, C) for accurate calculations.
  3. Is this calculator suitable for RNA sequences? No, this calculator is designed specifically for DNA sequences.
  4. What is the significance of knowing the molecular weight of DNA? Molecular weight is essential for various biological and biochemical studies, including PCR and DNA sequencing.
  5. Are there any limitations to this calculator? This calculator assumes a standard weight for each base and does not account for modifications or other factors that may affect the molecular weight.


The DNA Weight Calculator simplifies the task of determining the molecular weight of a DNA sequence. This information is invaluable in various scientific applications, and the calculator provides a quick and accurate way to obtain it. Whether you are a biologist, geneticist, or student, this tool can be a valuable asset in your research and studies.

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