Peptide calculators.
Reconstitution and dilution math, with a live-rendered syringe reference. Enter peptide mass and diluent volume; volumes, insulin-unit readings, and total aliquots per vial update instantly.
Choose the syringe scale you read measurements from at the bench.
U-100 Insulin · 1mL
Proper peptide reconstitution.
A reference procedure for laboratory protocols, sequenced from preparation to storage. Adjust to compound-specific solubility, your reconstitution solvent of choice, and the storage characteristics of the peptide you are working with.
- 01
Prepare materials
Sterile peptide vial, bacteriostatic water (0.9% benzyl alcohol), sterile insulin syringe, and 70% isopropyl alcohol swabs.
- 02
Sanitize surfaces
Wipe the rubber stoppers of both the diluent and peptide vials with an alcohol swab before any insertion.
- 03
Draw the diluent
Withdraw the calculated volume of bacteriostatic water using a sterile syringe. Reference the calculator above for the precise volume.
- 04
Inject slowly
Insert the needle into the peptide vial at a 45° angle. Release the diluent slowly down the inner vial wall, never spraying directly onto the lyophilized powder.
- 05
Dissolve without shaking
Swirl the vial in a slow, gentle circular motion until fully dissolved. Do not shake, as mechanical agitation can degrade peptide structure.
- 06
Store with care
Refrigerate at 2–8°C, away from direct light and freeze-thaw cycles. Note the reconstitution date directly on the vial, and use the calculated working concentration as your reference point for the lot.
For laboratory reference only. Bacteriostatic water with 0.9% benzyl alcohol is commonly used as a reconstitution diluent in research protocols. Actual reconstitution procedures depend on compound-specific solubility and batch documentation. Refer to compound-specific documentation for further guidance.
Everything a research chemist asks before running the math.
A breakdown of how the tool computes its outputs, the inputs it expects, and the conventions it respects. Select a question to read its answer.
What does this calculator actually compute?
It takes your reconstituted peptide mass, your diluent volume, and your target dose, and returns the working concentration (mg/mL and mcg/mL), the volume to withdraw per dose (mL and mcL), and the corresponding reading on every supported insulin-syringe scale.
How is working concentration calculated?
Working concentration = peptide mass (mg) ÷ diluent volume (mL). The tool then converts to mg/mL, mcg/mL, and to syringe-unit equivalents based on the syringe scale you have selected.
How is withdrawal volume computed from a target mass?
Withdrawal volume (mL) = target dose ÷ working concentration. The mcL equivalent is also shown, and the value is mapped directly to your selected syringe scale so it is read-ready at the bench.
Why do I need to choose a syringe type?
Different syringe scales (U-100 1mL, U-100 0.5mL, U-100 0.3mL, slip-tip volumes) display unit ticks at different real-world volumes. Selecting your specific syringe makes the calculator return values that match what you will actually see when drawing.
Which target unit should I select, mcg, mg, or units?
It depends on how the reference standard’s documentation is written. Most peptide reference standards are reported in milligrams or micrograms (mass), while a smaller subset of insulin-analogue compounds are conventionally reported in international units. The calculator accepts any of the three and back-converts to volume based on the working concentration after reconstitution. If unsure, default to mcg, the unit most commonly used in published peptide research protocols.
Why are my calculated volumes so small?
Research peptides are potent. A 5 mg vial reconstituted in 2 mL yields 2.5 mg/mL, meaning a 250 mcg target dose is only 100 mcL. If volumes feel uncomfortably small, either reduce peptide mass per vial or increase diluent volume on the next reconstitution.
What if a result looks off?
Start by re-checking the three input fields, peptide mg amount, bacteriostatic water volume, and target dose. Small entry errors in any of these can create large output drift. If you suspect a measurement was entered incorrectly and want a second set of eyes on the math, reach our team through the contact page and we will walk through it with you.
For Laboratory Use Only. Not for Human or Veterinary Consumption. This calculator provides reconstitution math, not dosing guidance.