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.

Absorbance A260

A finite measured or assumed value greater than or equal to 0.

Absorbance A230

A finite measured or assumed value.

The implementation follows this calculation rule: Calculate the A260/A230 purity ratio used to detect organic compounds and salts carried over from extraction.

Purity ratio

The calculated purity ratio.

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. Ratios and percentages become unstable when their denominator is small, uncertain, or defined differently between samples.

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.

• 260/280 Ratio

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

• DNA Conc From A260

  Convert an A260 absorbance reading into double-stranded DNA concentration using the 50 ng/µL per absorbance unit factor.

• RNA Conc From A260

  Convert an A260 absorbance reading into RNA concentration using the 40 ng/µL per absorbance unit factor.