Peptide Concentration & Dilution Calculator
Work out stock-solution concentration (mg/mL) and the aliquot volume for a target mass of lyophilised research peptide. In vitro laboratory use only.
Vial contents (mg)
Required aliquot
Solvent volume
About this calculator
This free peptide calculator helps researchers work out concentration, dilution and sample size in the lab — including for BPC-157, TB-500, GHK-Cu, CJC-1295 and other lyophilised peptides used in in vitro studies. Enter your vial amount in mg, your solvent volume in mL and a required sample size in µg or mg. The tool returns the stock concentration in mg/mL and the transfer volume in mL and microlitres.
Unit conversions
Worked examples
Example 1: 10mg peptide vial
Scenario: 10mg peptide, want 1 mg sample
Suggested solvent volume: Add 2 mL solvent
Result: Transfer 0.2mL (200 µL) for ~1 mg sample
Example 2: 5mg peptide vial
Scenario: 5mg peptide, want 1 mg sample
Suggested solvent volume: Add 1 mL solvent
Result: Transfer 0.2mL (200 µL) for ~1 mg sample
Examples by vial size
For in vitro research use only. Illustrative measurement scenarios — not human or veterinary guidance.
BPC-157 5mg
Vial: 5mg lyophilised BPC-157
Stock solution: 2 mL solvent → 2.5 mg/mL
1 mg aliquot: transfer 0.4mL (400 µL)
TB-500 5mg
Vial: 5mg lyophilised TB-500
Stock solution: 2 mL solvent → 2.5 mg/mL
1 mg aliquot: transfer 0.4mL (400 µL)
GHK-Cu 50mg
Vial: 50mg lyophilised GHK-Cu
Stock solution: 5 mL solvent → 10 mg/mL
1 mg aliquot: transfer 0.1mL (100 µL)
CJC-1295 2mg
Vial: 2mg lyophilised CJC-1295
Stock solution: 2 mL solvent → 1 mg/mL
0.5 mg aliquot: transfer 0.5mL (500 µL)
Frequently asked questions
How does the calculator work?
Enter the vial contents in mg and the solvent volume in mL; the tool returns the resulting stock concentration in mg/mL. Solvent selection and all handling are determined by the receiving laboratory under its own protocols. For in vitro research only.
What units does the calculator use?
Mass in milligrams and micrograms, volume in millilitres and microlitres — 1 mg = 1000 µg, 1 mL = 1000 µL. Both mass fields stay in sync, so you can work in whichever unit your protocol is written in.
Why does it suggest a particular solvent volume?
It favours volumes that land your target aliquot on a round, comfortably pipettable figure, typically between 50 and 500 µL. Below about 10 µL transfer accuracy falls off on most air-displacement pipettes, so the tool steers towards a larger solvent volume rather than a smaller transfer.
How long is a reconstituted solution stable?
Our stability data show stability of up to 28 days at 2–8 °C in aqueous solution for most lyophilised peptides in this range, protected from light; unopened vials are typically held at −20 °C. Figures are compound-specific — the SDS tab on each product page carries that product’s own values.
My vial size is not one of the buttons
Use the “Or enter another vial size” field beneath them. Any vial mass in milligrams works, including sizes that are not on the preset list.