Enter verified values. Get the unit conversion.
A peptide calculator converts the vial amount, diluent volume, and instructed amount you enter into concentration, mL, and syringe units. It performs the arithmetic; it does not choose an amount or preparation for you.
Your vial
Step 1This worksheet uses editable example or user-provided values. It does not select or recommend an amount. Verify every input against the product label, prescription, or qualified professional.
Enter an amount to see your conversion
Use the amount from your label or instructions, or choose an illustrative quick start to preview the calculator.
Keep your verified setup in one place
After confirming the values, save the protocol record, reminders, and refill notes in The Peptide App.
Calculator by peptide
Open a named worksheet with a common vial-size example, then verify every field against your own label or instructions. You can also browse the full peptide library or see how The Peptide App keeps your verified setup, reminders, and protocol log together.
See the formula, assumptions, and limitations
Our public methodology shows every conversion step, what the calculator stores, and when the result should not be used.
How to reconstitute a peptide
A plain-English walkthrough, for research and educational purposes only.
- 1
Check the vial label
Confirm the peptide amount on the vial, usually listed in milligrams.
- 2
Copy the instructed diluent volume
Enter the diluent volume stated by the product instructions or a qualified professional. The calculator does not determine that volume.
- 3
Copy the instructed amount
Use the amount from the label, prescription, protocol, or professional guidance, then choose mg or mcg. Do not use this worksheet to select an amount.
- 4
Review the mathematical conversion
The calculator shows the resulting concentration, mL volume, and syringe-unit conversion. Check that the inputs and selected syringe match the instructions you were given.
- 5
Label and store the vial
Write down the concentration and the date you mixed it, then follow the storage guidance that came with the product.
Questions people ask
The reconstitution details that trip most people up.
How much bacteriostatic water should I use?
There is no single correct amount for every vial, and this calculator does not choose one. Enter only the diluent volume stated by your product instructions or a qualified professional.
How many units do I draw on an insulin syringe?
Units depend on the vial amount, BAC water volume, target amount, and syringe type. On a standard U-100 insulin syringe, 100 units equals 1 mL, so the calculator converts the draw volume into the matching unit mark.
How do I convert mcg to units?
First convert mcg to mg by dividing by 1,000. Then divide that mg amount by the concentration in mg per mL to get mL, and multiply by the syringe units per mL. The calculator does this automatically.
How long does reconstituted peptide last?
Storage life varies by compound, sterility, handling, and supplier instructions. Many research peptides are stored refrigerated after mixing, but you should follow the product documentation and consult a qualified professional for your situation.
How do you calculate a peptide dose?
Divide the peptide amount in the vial by the volume of bacteriostatic water you add to get the concentration in mg per mL. Divide your target dose by that concentration to get the volume to draw, then convert it to insulin-syringe units. This calculator runs the full conversion for you — it does not recommend a dose, so use the amount from your protocol, product label, or a qualified professional.
How do I use a peptide calculator?
Enter three verified values: the peptide amount printed on the vial, the instructed diluent volume, and the instructed amount in mg or mcg. The calculator returns the mathematical syringe-unit conversion, resulting concentration, and number of instructed amounts per vial.
Does this calculator work for tirzepatide and semaglutide?
The calculator can run the same concentration and unit-conversion formula for any compatible vial when you supply verified inputs. Product forms and instructions vary, so confirm that reconstitution is actually required and use only the values supplied with your product or by a qualified professional.
This calculator is for research and educational purposes. It does not diagnose, treat, prescribe, or replace guidance from a licensed professional. Always follow the instructions provided with your product.