Use this molecular-biology calculation when the sequence orientation, reading frame, absorbance blank, path-length normalization, or primer coordinates match the tool's stated convention.

Forward position

An integer count greater than or equal to 1, expressed in bp.

Reverse position

An integer count greater than or equal to 1, expressed in bp.

The implementation follows this calculation rule: Calculate the amplicon length in base pairs spanned by forward and reverse primer positions.

Amplicon length

The calculated amplicon length in bp.

Spectral ratios are contamination indicators rather than proof of sample identity or integrity, and sequence calculations depend on the supplied symbols and coordinate convention. Low concentration, an incorrect blank, mixed templates, or incomplete codons can make a mathematically valid result misleading. Preserve the input values and units so the result can be audited and recalculated.

For nucleic-acid quantity or purity, compare absorbance with a dye-based assay and an integrity check. For sequence calculations, verify orientation and reading frame with an alignment, primer-analysis, or translation tool.

• DNA Copy Number

  Calculate the number of DNA molecules from mass in nanograms and length in base pairs.

• 260/280 Ratio

  Calculate the A260/A280 purity ratio used to assess nucleic acid contamination by protein.

• qPCR Copy Number

  Convert a double-stranded DNA mass in nanograms to molecule count using length and the mean base pair mass of 650 daltons.