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DNA Molecular Weight Calculator

dsDNA molecular weight = bp x 650 g/mol/bp.

Introduction

DNA Molecular Weight Calculator — dsDNA molecular weight = bp x 650 g/mol/bp. Enter Length (bp, double-stranded) to get an instant, accurate result.

Formula

Double-stranded DNA molecular weight ≈ number of base pairs × 650 g/mol per bp — a standard quick-estimate average accounting for both strands of the duplex.

Step-by-step

  1. Enter the Length (bp, double-stranded).
  2. Click Calculate to see your result instantly.

Real-world example

Example: With Length (bp, double-stranded) = 1000, the DNA Molecular Weight Calculator gives Molecular Weight G Mol: 650000.

Frequently Asked Questions

Why 650 g/mol per base pair?
It's a widely used average molecular weight for one base pair of double-stranded DNA (averaging across A-T and G-C pairs and both strands' sugar-phosphate backbones), commonly used by labs and reagent suppliers for quick concentration/molarity conversions.
Is this exact for any specific sequence?
No — it's an average approximation; the true molecular weight varies slightly with the exact base composition, since A-T and G-C pairs don't have identical mass.
What inputs does the DNA Molecular Weight Calculator need?
You'll need to provide: Length (bp, double-stranded). All fields use sensible defaults, so you can see a working example immediately and then adjust the values to match your own numbers.
How accurate is the DNA Molecular Weight Calculator?
The DNA Molecular Weight Calculator applies the formula exactly as calculated — Double-stranded DNA molecular weight ≈ number of base pairs × 650 g/mol per bp — a standard quick-estimate average accounting for both strands of the duplex. — so results are precise for the inputs you provide. Accuracy depends on entering correct, realistic input values.
Is the DNA Molecular Weight Calculator free to use?
Yes, the DNA Molecular Weight Calculator is completely free, requires no signup, and runs instantly in your browser.

About the DNA Molecular Weight Calculator

The DNA Molecular Weight Calculator uses a real, verifiable formula — Double-stranded DNA molecular weight ≈ number of base pairs × 650 g/mol per bp — a standard quick-estimate average accounting for both strands of the duplex. — so results are accurate every time, not an approximation.