How to use the dna purity and concentration from a260 calculator
Find DNA concentration and purity from absorbance readings at 260 nm and 280 nm. Enter absorbance at 260 nm, absorbance at 280 nm, dilution factor in the fields above; the purity ratio a260/a280, dna concentration, purity assessment are computed instantly and plotted on the chart so you can see how the answer changes.
Common searches this calculator answers include “DNA purity ratio A260/A280”, “DNA concentration spectrophotometer”, “nucleic acid purity”, “calculate dna purity and concentration from a260”, “find purity ratio a260/a280”.
Formula
Variables
- A260 — Absorbance at 260 nm
- A280 — Absorbance at 280 nm
- dil — Dilution factor
Worked example
With absorbance at 260 nm = 0.5, absorbance at 280 nm = 0.25, dilution factor = 1, the calculator gives purity ratio a260/a280 ≈ 2; dna concentration ≈ 25 µg/mL; purity assessment ≈ Pure DNA (ratio about 1.8 or higher) text.
Frequently asked questions
What is the dna purity and concentration from a260 calculator used for?
Find DNA concentration and purity from absorbance readings at 260 nm and 280 nm. It helps with questions such as “DNA purity ratio A260/A280”, “DNA concentration spectrophotometer”, “nucleic acid purity”.
What is the formula for the dna purity and concentration from a260 calculation?
Purity ratio A260/A280 = A260 / A280. DNA concentration (µg/mL) = A260 × 50 × dil. Purity assessment (text) = [Purity ratio A260 / A280]>=1.8?"Pure DNA (ratio about 1.8 or higher)":"Possible protein contamination". Here A260 is absorbance at 260 nm, A280 is absorbance at 280 nm, dil is dilution factor.
What inputs do I need for the dna purity and concentration from a260 calculator?
You need absorbance at 260 nm, absorbance at 280 nm, dilution factor. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use the dna purity and concentration from a260 calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the dna purity and concentration from a260 result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.