DNA Concentration Calculator
Calculate DNA or RNA concentration and purity from UV absorbance (A260) spectrophotometry measurements.
Input Parameters
Instant Real-time CalculationConcentration = A260 * Factor * Dilution. The A260/A280 ratio reflects sample purity (pure DNA ~1.8, pure RNA ~2.0).
Understanding DNA Concentration Calculator & Formula
The DNA Concentration Calculator on CalculatorScale.com is engineered to deliver instant, mathematically verified calculations conforming strictly to standard institutional equations. Whether planning long-term investments, managing household budgets, tracking clinical fitness targets, analyzing academic genetics, calculating veterinary dosages, or converting dimensional units, every calculation updates dynamically in real time without lag.
Every formula used in this tool adheres to certified international standards, including World Health Organization biometric metrics, veterinary clinical guidelines, NIST physical conversion constants, and standard biological equations. Results are computed entirely client-side inside your browser with complete data privacy, ensuring your sensitive numbers and statistics never leave your device.
Our calculators are 100% free with no registration, subscriptions, or paywalls required. You can toggle between imperial and metric units, customize input parameters, export calculation summaries, or embed this calculator directly into your own website or blog.
Nucleic Acid Extinction Coefficients & Purity Ratios
How to Use the DNA Concentration Calculator
- 1 Measure sample absorbance at 260 nm (A260) and 280 nm (A280) using a spectrophotometer (e.g. NanoDrop).
- 2 Select your nucleic acid type (dsDNA, ssDNA, RNA, or oligo).
- 3 Input the dilution factor (e.g. 1 for undiluted, 50 for 1:50 dilution).
- 4 The calculator outputs total concentration in µg/mL (ng/µL) and checks A260/A280 purity.
DNA Concentration Calculator — Frequently Asked Questions
Q1 What does an A260 of 1.0 mean for DNA? ▾
An optical density (OD) of 1.0 at 260 nm corresponds to approximately 50 µg/mL of double-stranded DNA in a standard 1 cm path length.
Q2 What is a good A260/A280 ratio? ▾
For pure DNA, an A260/A280 ratio of ~1.8 is ideal. For pure RNA, a ratio of ~2.0 is expected.
Q3 How do I convert µg/mL to ng/µL? ▾
1 µg/mL is exactly equal to 1 ng/µL. The numeric value remains unchanged.
Q4 Why does phenol affect A260? ▾
Phenol absorbs strongly at 270 nm and elevates apparent A260 readings, causing an overestimate of DNA concentration.
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