GLP-1 Peptide Calculator

Tirzepatide, semaglutide, and other GLP-1 compounds are typically reconstituted from a lyophilized vial before dosing. Enter the exact peptide amount printed on your vial, the bacteriostatic water you added, and the dose you already have, to get a concentration and syringe draw. Looking for a specific compound? Tirzepatide and semaglutide each have a dedicated page with compound-specific vial size placeholders.

Peptide amount in vial

The total peptide mass printed on your vial label.

mgmcg

Bacteriostatic water added

How much water you added to reconstitute the vial.

Desired dose

The dose you already have — this tool converts it, it doesn't choose it for you.

mgmcg

Syringe size (U-100)

0.3 mL0.5 mL1.0 mL

Results

Syringe draw

—u

Enter your dose above

Concentration (mg/mL): 5.00 mg/mL
Concentration (mcg/mL): 5,000.00 mcg/mL
Injection volume: Enter your dose above
mcg per unit: 50.00 mcg
Doses per vial: —

Formula: dose ÷ concentration × 100 — see methodologyFormulas verified: July 23, 2026No data leaves your browser

Arithmetic only — this tool does not recommend a dose.

How this calculator works

Concentration = peptide amount ÷ bacteriostatic water volume.
Injection volume = your dose ÷ that concentration.
Syringe units = injection volume × 100, since a U-100 syringe holds 100 units per mL.

GLP-1 peptide dosing chart

This chart converts between units only — it is not a recommended dose for any compound. Your prescribed or protocol dose comes from your own paperwork, not this chart.

mg to mcg
mg	mcg
0.1 mg	100 mcg
0.25 mg	250 mcg
0.5 mg	500 mcg
1 mg	1,000 mcg
2 mg	2,000 mcg
5 mg	5,000 mcg
10 mg	10,000 mcg

mL to U-100 syringe units
mL	Units
0.05 mL	5 units
0.1 mL	10 units
0.2 mL	20 units
0.25 mL	25 units
0.5 mL	50 units
0.75 mL	75 units
1.0 mL	100 units

How much bacteriostatic water for GLP-1 peptides?

GLP-1 peptides — tirzepatide, semaglutide, or others — don't have one correct water amount; whatever you add sets that vial's concentration. More water spreads the same GLP-1 mass thinner, so a given dose needs a larger volume; less water concentrates it, needing less. Enter your vial's mg and water volume above to see the result.

GLP-1 peptide units calculator

Units are the U-100 syringe scale — 100 units per mL — and they apply the same way whether your GLP-1 vial holds tirzepatide, semaglutide, or another compound. This calculator takes the injection volume from your GLP-1 dose and converts it into that unit count, so you read a number off the syringe instead of a milliliter fraction.

Frequently asked questions

What is a GLP-1 peptide calculator?

GLP-1 refers to a class of compounds — including tirzepatide and semaglutide — often reconstituted from a lyophilized vial before dosing. This calculator works out that vial's concentration from its peptide amount and water volume, then converts a dose into an injection volume and syringe unit count. The math is the same across the whole class.

Does this work as a peptide calculator for tirzepatide?

Yes. Enter your tirzepatide vial's amount and water volume here, or use the dedicated tirzepatide reconstitution calculator, which has tirzepatide-specific vial size placeholders.

Does this work as a semaglutide peptide calculator?

Yes, the same way — or use the dedicated semaglutide reconstitution calculator for semaglutide-specific vial size placeholders.

Is this a peptide calculator in mg for weight loss compounds?

It's a general-purpose calculator that happens to cover compounds commonly used in weight-management protocols, such as tirzepatide and semaglutide. It converts mg or mcg doses into a syringe draw; it does not recommend a dose or a compound for weight loss or any other purpose.

Is there a GLP-1 peptide dosing chart?

See the mg/mcg and mL/units conversion chart below. It converts between units only — it does not list a recommended dose for tirzepatide, semaglutide, or any other GLP-1 compound, which should come from your own prescription or protocol.

Is this a free GLP-1 peptide calculator?

Yes. It runs entirely in your browser, with no account, no login, and no data sent anywhere.

Is this GLP-1 peptide calculator medical advice?

No. It applies one formula — mass divided by volume, then dose divided by concentration — to the numbers you enter. It does not suggest a dose, a vial size, or a compound. See the medical disclaimer for full detail.

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Educational tool only, not medical advice — verify with a licensed clinician. See the full medical disclaimer.