DNA Copy Number Calculator
How to calculate DNA copy number
- Choose copies from mass, or mass for a number of copies.
- Choose double-stranded DNA, single-stranded DNA or RNA, and type the length.
- Type the mass in ng or the number of copies. The answer appears as you type.
Frequently asked questions
What is the formula?
Copies = mass (g) × 6.022 × 10²³ / (length × average mass per base pair). For double-stranded DNA the mass is 617.96 g/mol per base pair plus 36.04 g/mol for the ends.
How many copies are in 1 ng of a 3 kb plasmid?
About 3 × 10⁸.