OL Research supplies research materials exclusively for laboratory use. All products are handled and distributed in accordance with UK regulations governing research chemicals. We do not advise, support or condone the use of research chemicals in humans or animals.

Research Tools

🔄 Peptide Unit Converter — Mass, Molar & Concentration

Free laboratory calculator for research use. Results display instantly in-browser — no data is transmitted.

Home › Research Tools › Peptide Unit Converter — Mass, Molar & Concentration

About This Calculator

Laboratory data exists across multiple unit systems — mass concentrations (mg/mL, µg/mL), molar concentrations (mM, µM, nM), volumes (mL, µL), and mass amounts (mg, µg, ng). Converting between these systems is a frequent source of errors in data analysis and protocol preparation, particularly when comparing results from different instruments or publications that use different conventions.

This converter handles all standard unit families used in peptide research in a single tool. For molar ↔ mass conversions, enter the compound's molecular weight — available on every OL Research Certificate of Analysis and in the reference table on the molarity calculator. Volume conversions require no additional parameters.

Common conversions needed in peptide research: converting a published IC50 in nM to µg/mL for stock preparation; converting a dose from mg/kg to µg for a specific animal weight; converting µL pipette volumes to mL for dilution calculations. All are handled here with four significant figures of precision.

Calculator

Equivalents

Frequently Asked Questions

How do I convert nM to µg/mL for a peptide?
You need the peptide's molecular weight (MW in g/mol). Formula: µg/mL = nM × MW ÷ 1,000,000. Example: 100 nM of a 1419 Da peptide (BPC-157) = 100 × 1419 ÷ 1,000,000 = 0.1419 µg/mL. Enter the values into this converter and it performs the calculation automatically.
What is the difference between mg/mL and mM?
mg/mL is a mass concentration (weight per volume). mM is a molar concentration (moles per litre × 1000). They describe the same solution differently — mg/mL is independent of molecular weight, while mM accounts for it. A 1 mg/mL solution of a small peptide (400 Da) is ~2.5 mM; the same mass concentration of a large peptide (5000 Da) is only ~0.2 mM.
How many µL are in a mL?
1 mL = 1,000 µL. This is the most common source of 1000-fold errors in pipetting calculations — always verify which unit a protocol specifies before preparing reagents.