How do you calculate a peptide dose after reconstitution?

Two steps. First, concentration = peptide mass in the vial ÷ the bacteriostatic water you add. A 5 mg vial reconstituted with 2 mL of water is 2.5 mg/mL, i.e. 2,500 mcg/mL. Second, the volume to draw = your desired dose ÷ that concentration. For a 250 mcg dose at 2,500 mcg/mL, that's 0.1 mL — which on a U-100 insulin syringe (100 units = 1 mL) is 10 units. This calculator does both steps for you.

How many units is my dose on an insulin syringe?

A U-100 insulin syringe is marked so that 100 units = 1 mL, so units = the volume in mL × 100. The calculator shows the unit reading directly. Note that 'units' here is just a volume marking — it has nothing to do with how many micrograms of peptide you've drawn; that depends entirely on your concentration.

How much bacteriostatic water should I add to a peptide vial?

There's no single 'correct' amount — the water volume only sets the concentration, and therefore how many units you draw per dose. More water makes each dose a larger, easier-to-measure volume but fewer total doses per vial of the same size; less water concentrates it. Common choices are 1–3 mL. Use the calculator to see how a given volume changes your unit reading. Bacteriostatic (not plain sterile) water is used because its benzyl alcohol inhibits bacterial growth in a multi-dose vial.

Does this work as a BPC-157, TB-500 or CJC-1295/ipamorelin dosage calculator?

Yes — the reconstitution math is identical for any lyophilized peptide. Pick the molecule to prefill a common vial size, then enter the water you're adding and your dose. The arithmetic is the same whether it's BPC-157, TB-500, sermorelin, ipamorelin or any other; only the numbers change.

Is this calculator telling me how much to take?

No. It is pure arithmetic — it converts a vial size, a water volume and a dose you choose into a syringe reading. It contains no dosing recommendations, and it cannot verify what an unregulated 'research' vial actually contains. Most research peptides are unapproved and sold outside the prescription system; reconstituting and injecting is a licensed clinician's job. See our explainer on how reconstitution works and why the regulated route exists.

How do you calculate a peptide dose after reconstitution?

Two steps. First, concentration = peptide mass in the vial ÷ the bacteriostatic water you add. A 5 mg vial reconstituted with 2 mL of water is 2.5 mg/mL, i.e. 2,500 mcg/mL. Second, the volume to draw = your desired dose ÷ that concentration. For a 250 mcg dose at 2,500 mcg/mL, that's 0.1 mL — which on a U-100 insulin syringe (100 units = 1 mL) is 10 units. This calculator does both steps for you.

How many units is my dose on an insulin syringe?

A U-100 insulin syringe is marked so that 100 units = 1 mL, so units = the volume in mL × 100. The calculator shows the unit reading directly. Note that 'units' here is just a volume marking — it has nothing to do with how many micrograms of peptide you've drawn; that depends entirely on your concentration.

How much bacteriostatic water should I add to a peptide vial?

There's no single 'correct' amount — the water volume only sets the concentration, and therefore how many units you draw per dose. More water makes each dose a larger, easier-to-measure volume but fewer total doses per vial of the same size; less water concentrates it. Common choices are 1–3 mL. Use the calculator to see how a given volume changes your unit reading. Bacteriostatic (not plain sterile) water is used because its benzyl alcohol inhibits bacterial growth in a multi-dose vial.

Does this work as a BPC-157, TB-500 or CJC-1295/ipamorelin dosage calculator?

Yes — the reconstitution math is identical for any lyophilized peptide. Pick the molecule to prefill a common vial size, then enter the water you're adding and your dose. The arithmetic is the same whether it's BPC-157, TB-500, sermorelin, ipamorelin or any other; only the numbers change.

Is this calculator telling me how much to take?

No. It is pure arithmetic — it converts a vial size, a water volume and a dose you choose into a syringe reading. It contains no dosing recommendations, and it cannot verify what an unregulated 'research' vial actually contains. Most research peptides are unapproved and sold outside the prescription system; reconstituting and injecting is a licensed clinician's job. See our explainer on how reconstitution works and why the regulated route exists.

Interactive tool

Peptide reconstitution & dosage calculator

Reconstitution is one division, and the dose is one more. Enter the peptide in the vial, the bacteriostatic water you add, and the dose you’re aiming for — this works out the concentration, the units to draw on a U-100 insulin syringe, and how many doses the vial holds. It’s the arithmetic, nothing more: not a dose recommendation, and no substitute for a clinician.

Common peptide (prefills a typical vial size)

1. Peptide in the vialmg

2. Bacteriostatic water addedmL

3. Desired dose

mcg

Draw this much

10units on a U-100 syringe

= 0.1 mL for a 250 mcg dose

050100 units

Concentration: 2.5 mg/mL; 2,500 mcg/mL
Doses per vial: 20; at this dose

The math only. It assumes the vial truly contains the labeled mass and that you draw with a U-100 insulin syringe (100 units = 1 mL). It is not a dose recommendation, and it can’t verify what an unregulated vial actually contains.

The math, in plain terms

Reconstituting a peptide just means dissolving the freeze-dried powder back into liquid. The only number that matters is the concentration: the peptide’s mass divided by the water you add. Add 2 mL of bacteriostatic water to a 5 mg vial and you have 2.5 mg/mL — or 2,500 mcg in every millilitre. From there, the volume for a dose is the dose divided by that concentration: a 250 mcg dose is 0.1 mL, which a U-100 insulin syringe reads as 10 units. The water volume doesn’t change how much drug you take — it only changes how many units that dose works out to, and how many doses the vial yields.

The honest caveat the calculators rarely mention: this arithmetic assumes the vial actually contains the labeled mass. With unregulated “research” peptides, no one has verified that — so precise math on an unknown powder still tells you nothing about what you’re really drawing. For the full, safety-forward walkthrough — bacteriostatic vs sterile water, sterility, and why the legitimate route runs through a clinician and compounding pharmacy — read how to reconstitute peptides. To anchor any spend to the evidence first, see the peptide evidence matrix and what peptide therapy actually costs.

Common questions

How do you calculate a peptide dose after reconstitution?: Two steps. First, concentration = peptide mass in the vial ÷ the bacteriostatic water you add. A 5 mg vial reconstituted with 2 mL of water is 2.5 mg/mL, i.e. 2,500 mcg/mL. Second, the volume to draw = your desired dose ÷ that concentration. For a 250 mcg dose at 2,500 mcg/mL, that's 0.1 mL — which on a U-100 insulin syringe (100 units = 1 mL) is 10 units. This calculator does both steps for you.
How many units is my dose on an insulin syringe?: A U-100 insulin syringe is marked so that 100 units = 1 mL, so units = the volume in mL × 100. The calculator shows the unit reading directly. Note that 'units' here is just a volume marking — it has nothing to do with how many micrograms of peptide you've drawn; that depends entirely on your concentration.
How much bacteriostatic water should I add to a peptide vial?: There's no single 'correct' amount — the water volume only sets the concentration, and therefore how many units you draw per dose. More water makes each dose a larger, easier-to-measure volume but fewer total doses per vial of the same size; less water concentrates it. Common choices are 1–3 mL. Use the calculator to see how a given volume changes your unit reading. Bacteriostatic (not plain sterile) water is used because its benzyl alcohol inhibits bacterial growth in a multi-dose vial.
Does this work as a BPC-157, TB-500 or CJC-1295/ipamorelin dosage calculator?: Yes — the reconstitution math is identical for any lyophilized peptide. Pick the molecule to prefill a common vial size, then enter the water you're adding and your dose. The arithmetic is the same whether it's BPC-157, TB-500, sermorelin, ipamorelin or any other; only the numbers change.
Is this calculator telling me how much to take?: No. It is pure arithmetic — it converts a vial size, a water volume and a dose you choose into a syringe reading. It contains no dosing recommendations, and it cannot verify what an unregulated 'research' vial actually contains. Most research peptides are unapproved and sold outside the prescription system; reconstituting and injecting is a licensed clinician's job. See our explainer on how reconstitution works and why the regulated route exists.