DNA Copy Number Calculator
Estimate DNA molecule copy number from mass and fragment length.
DNA Copy Number measurements
Enter your values, then calculate.
Result
How to calculate dna copy number
This calculator estimates DNA copy number from mass and fragment length — a common calculation in molecular biology for qPCR and cloning work.
How the calculation works
Copy number = (DNA mass in ng × 6.022×10^14) ÷ (Fragment length in bp × 660). The constant 660 g/mol is the average molecular weight per base pair, and 6.022×10^14 relates nanograms to Avogadro's number scaled appropriately.
Example
10 ng of DNA at 1,000 bp fragment length: (10×6.022e14)÷(1,000×660) = 6.022e15÷6.6e5 ≈ 9.13×10^9 copies.
Frequently asked questions
How is Result calculated?
Result = ([DNA mass] × 602200000000000) ÷ ([Fragment length] × 660).
Is the DNA Copy Number Calculator free to use?
Yes — every calculator on Simple Calculator Tools is free, runs in your browser, and does not require an account.
DNA Copy Number Calculator
Copy number = (DNA mass in ng × 6.022×10^14) ÷ (Fragment length in bp × 660). The constant 660 g/mol is the average molecular weight per base pair, and 6.022×10^14 relates nanograms to Avogadro's number scaled appropriately.
Let's understand your dna copy number result.
Calculate a result above and this guide will help you interpret it using this calculator's own formula and explanation.
Pro Tips for DNA Copy Number
- Fragment length should reflect your actual amplicon or plasmid size, since copy number is inversely proportional to it.
- This is a standard calculation for preparing qPCR standard curves from known DNA quantities.
Common DNA Copy Number Mistakes to Avoid
- Using the wrong fragment length (e.g., total plasmid size when you actually want the amplicon size, or vice versa), which produces an incorrect copy number.
When to Use This Calculator
This calculator estimates DNA copy number from mass and fragment length — a common calculation in molecular biology for qPCR and cloning work.