Stock solution & dilution calculator
Laboratory arithmetic for preparing research solutions: stock concentration, dilutions and weigh-out masses. Pick a compound to fill in its molecular weight, or type your own.
Leave peptide content at 100% for a nominal figure, or enter the net peptide content from your analysis.
- Concentration (mg/mL)
- 2.5 mg/mL
- Concentration (µg/mL)
- 2,500 µg/mL
Add a molecular weight to see molar values.
Peptide in solution: 5 mg
Arithmetic for laboratory solutions only. For research use only; this site gives no dosing or administration guidance.
Frequently asked questions
Why do I need the peptide content (purity) figure?
Purity from HPLC describes how much of the peptide is the target sequence, while the vial also holds counter-ions and moisture. If you know the net peptide content you can enter it to get a more accurate concentration; if not, leave it at 100% for a nominal figure.
What is the difference between mg/mL and molar concentration?
Mass concentration counts grams per litre, molar concentration counts molecules. Converting needs the molecular weight, which is why the calculator asks for it and can fill it in from a compound on this site.
Does this tell me how much to give or inject?
No. It only does laboratory solution arithmetic: concentration, dilution and weighing. peptide.wiki covers research use only and gives no dosing or administration guidance.
Peptide research tools
Where to buy
Why we send researchers to Nordapep
Comparing compounds is only half the job. The other half is knowing the vial contains what the label says. Nordapep publishes batch documentation for every compound it sells.
Browse the Nordapep catalogue →Each batch reference on the label matches its CoA, so you can check what is in the vial.
Enter the batch reference from your vial into Nordapep's batch-verification tool.
Purity is reported by RP-HPLC, the standard method for peptides of this size.
Bundled stacks for common comparisons, plus tiered pricing for volume orders.