Protein Concentration Calculator
Calculate protein concentration from UV absorbance at 280 nm using the Beer-Lambert law and molar extinction coefficient.
Input Parameters
Instant Real-time CalculationAccording to Beer-Lambert law: Molar Concentration = A280 / (ε * b). Mass concentration (mg/mL) = Molar Concentration (M) * Molecular Weight (g/mol).
Understanding Protein Concentration Calculator & Formula
The Protein 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.
Common Protein Reference Constants
How to Use the Protein Concentration Calculator
- 1 Measure sample A280 on a spectrophotometer blanked with your buffer.
- 2 Enter the known or predicted molar extinction coefficient (ε) based on tryptophan, tyrosine, and cystine residues.
- 3 Enter the protein molecular weight in Daltons.
- 4 Obtain exact protein concentration in mg/mL and µM.
Protein Concentration Calculator — Frequently Asked Questions
Q1 Why measure protein at 280 nm? ▾
Aromatic amino acids (tryptophan, tyrosine, and to a lesser extent phenylalanine and cystine disulfide bonds) absorb UV light strongly at 280 nm.
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