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DNA Copy Number From Mass — result sheet
Estimate the number of double-stranded DNA molecules from mass and a safe whole-number base-pair length.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Average molecular mass = lengthBp x 660 g/mol; copies = massNg x 1e-9 g x 6.02214076e23 / average molecular mass.
Estimate average double-stranded DNA molecular mass and molecule count from mass and a safe whole-number length. The 660 g/mol per base-pair coefficient and exact Avogadro constant are explicit; sequence composition, topology, end effects, sample loss, and exact molecule counting are not modeled.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- DNA mass — ng; Must be positive.; minimum 1.0E-6; maximum 1000000000
- DNA length — bp; Must be a safe whole number of base pairs.; minimum 1; maximum 1000000000
Worked example
| Input | Value |
|---|---|
| DNA mass | 1 |
| DNA length | 1000 |
A 1 ng, 1,000 bp double-stranded DNA sample has an average molecular mass of 660,000 g/mol and about 9.12446e8 copies.
Assumptions and limits
- The DNA is represented as a double-stranded molecule with a positive safe whole-number length in base pairs.
- Average molecular mass is approximated as 660 g/mol per base pair and the entered nanogram mass is converted to grams before using the Avogadro constant.
- The copy result is an estimated number based on average composition and does not claim exact integer molecule counting or account for sequence composition, topology, ends, or sample loss.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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