Peptide Dosage Calculator — mg, µg & insulin units from any vial.
A free peptide dosage calculator that turns any peptide vial into a precise dose. Type the vial mass in mg and the volume of bacteriostatic water added in mL to get concentration in mg/mL and µg/mL. Then enter your target dose in mg or µg and instantly read mL per dose, µg per dose, and the equivalent insulin-syringe marks on a U-100, U-50 or U-30 syringe. Formula shown on every result.
Open the peptide dosage calculator Try the concentration calculator
Free peptide dosage calculator
Solve for concentration (mg/mL and µg/mL) from vial mass and BAC water, then convert a target per-dose mass into mL per dose and insulin-syringe units (U-100, U-50 or U-30). Pick common vial presets or type your own values — formula shown on every result.
Result — concentration, dose & insulin units
What Is the Peptide Dosage Calculator?
The peptide dosage calculator on PeptideCalculatorTools.com is a single-screen math tool that turns a vial mass and a diluent volume into a precise per-dose volume, plus the insulin-syringe units for that dose. It is the second step in the typical peptide workflow: first you reconstitute (handled by the reconstitution calculator), then you dose — that is what this page is for.
The peptide dosage calculator handles any peptide that comes as a lyophilised powder reconstituted with bacteriostatic water or sterile water — generic use, not a specific peptide. If you want peptide-specific BAC volumes and presets for common research concentrations, use the dedicated BPC-157 calculator, the TB-500 calculator, or the semaglutide calculator. For two-peptide combinations (BPC-157 + TB-500 in one vial) the peptide mixing calculator is the right tool.
How to Use the Peptide Dosage Calculator
1. Enter the peptide vial mass
Click the 2 mg, 5 mg, 10 mg, 15 mg or 30 mg preset, or type any other vial mass in mg (or µg). The unit selector converts µg → mg automatically inside the calculator. The default is 10 mg because that is a common research vial.
2. Enter the BAC water volume added to the vial
Type the volume of bacteriostatic water (or sterile water) added to the vial in mL (or µL). The calculator derives the concentration instantly in both mg/mL and µg/mL. Change either value to see the concentration update.
3. Enter the target dose and read the result
Type the per-dose mass in mg or µg and pick the insulin syringe scale (U-100, U-50 or U-30). The result panel shows the per-dose volume in mL, the mass in mg and µg, and the equivalent insulin-syringe units. The animated syringe visualises the per-dose volume as a fraction of a 1 mL U-100 syringe. Use Reset, Copy result, Print or Copy share link to capture the calculation.
How the Peptide Dosage Math Works
Step 1 — concentration from vial mass and BAC water
c = m ÷ V
c is concentration in mg/mL. m is the peptide vial mass in mg. V is the volume of bacteriostatic water added in mL. Example: a 10 mg vial reconstituted with 2 mL BAC water gives 10 ÷ 2 = 5 mg/mL (or 5 000 µg/mL).
Step 2 — dose volume from target mass and concentration
v = d ÷ c
v is the dose volume in mL. d is the target dose in mg. c is the concentration in mg/mL. Example: 0.25 mg ÷ 5 mg/mL = 0.050 mL per dose.
Step 3 — insulin-syringe units from dose volume
Each U-100 mark holds 0.01 mL; each U-50 mark holds 0.02 mL; each U-30 mark holds ≈ 0.033 mL.
units = v (mL) × syringe scale
Example: 0.050 mL × 100 = 5 U on a U-100 syringe; the same 0.050 mL = 2.5 U on U-50; ≈ 1.5 U on U-30. Always pick the scale that matches the physical syringe in your hand.
Step 4 — total doses per vial
If you plan to draw N doses from one vial, the total volume used is N × v, and the leftover BAC water is V − N × v. The calculator reports the doses-per-vial count from the doses-per-vial field if you fill it in.
Concentration vs Dose Volume — Quick Reference
How much volume to draw for common per-dose masses at the most commonly cited research concentrations.
| Per-dose mass | 2 mg/mL | 5 mg/mL | 10 mg/mL | concentration | U-100 marks |
|---|---|---|---|---|---|
| 0.05 mg (50 µg) | 0.025 mL | 0.010 mL | 0.005 mL | 2 → 5 → 10 mg/mL | 2.5 → 1 → 0.5 U |
| 0.10 mg (100 µg) | 0.050 mL | 0.020 mL | 0.010 mL | 2 → 5 → 10 mg/mL | 5 → 2 → 1 U |
| 0.25 mg (250 µg) | 0.125 mL | 0.050 mL | 0.025 mL | 2 → 5 → 10 mg/mL | 12.5 → 5 → 2.5 U |
| 0.50 mg (500 µg) | 0.250 mL | 0.100 mL | 0.050 mL | 2 → 5 → 10 mg/mL | 25 → 10 → 5 U |
| 1.00 mg (1 000 µg) | 0.500 mL | 0.200 mL | 0.100 mL | 2 → 5 → 10 mg/mL | 50 → 20 → 10 U |
A per-dose volume below 0.01 mL is below the smallest accurate U-100 reading for many syringes. For very low per-dose masses, raise the concentration (use less BAC water) — but watch the BAC volume stays above the smallest accurate U-100 reading, ≈ 0.05 mL.
Peptide Dosage Worked Examples
Example 1 — 10 mg ÷ 2 mL, 0.25 mg dose (Mathematical Example)
c = 10 ÷ 2 = 5.000 mg/mL. Dose volume = 0.25 ÷ 5 = 0.050 mL. On a U-100 syringe: 0.050 × 100 = 5 U. On U-50: 0.050 × 50 = 2.5 U.
Example 2 — 5 mg ÷ 1 mL, 0.10 mg dose
c = 5 ÷ 1 = 5.000 mg/mL. Dose volume = 0.10 ÷ 5 = 0.020 mL. U-100: 2 U. U-50: 1 U.
Example 3 — 30 mg ÷ 3 mL, 1 mg dose
c = 30 ÷ 3 = 10.000 mg/mL. Dose volume = 1 ÷ 10 = 0.100 mL. U-100: 10 U.
Example 4 — 2 mg ÷ 1 mL, 100 µg dose
c = 2 ÷ 1 = 2.000 mg/mL. Dose volume = 0.1 ÷ 2 = 0.050 mL. U-100: 5 U.
Example 5 — reverse: target 5 U on U-100 with 10 mg/mL
5 U × 0.01 mL = 0.050 mL drawn. Dose mass = 0.050 × 10 = 0.500 mg per dose. Doses per 10 mg vial: 10 ÷ 0.5 = 20.
Common Peptide Dosage Mistakes
Each U-100 mark is 0.01 mL — it is a volume, not a mass. The mass per mark depends entirely on concentration. At 5 mg/mL a U-100 mark is 0.05 mg (50 µg); at 10 mg/mL it is 0.1 mg (100 µg).
The vial mass printed on the label is the peptide mass, not the mass of peptide + water. Do not subtract the BAC water from the vial mass — the calculator does not either.
If the vial mass is in mg and the BAC water is in µL, the calculator handles the conversion. If you type 2 mL of BAC water but meant 2 µL, you are off by 1 000×. Always check the unit dropdowns.
U-30 means 1 mL = 30 units, not 100. A 30-mark on a U-30 syringe is 30 × 0.033 mL = 1 mL, the full barrel. Pick the syringe in the calculator that matches the physical syringe.
Peptide Dosage Calculator FAQ
What does the peptide dosage calculator do?
It converts a peptide vial mass (mg) and the volume of BAC water added (mL) into concentration (mg/mL and µg/mL), then converts a per-dose mass (mg or µg) into mL per dose, µg per dose, and insulin-syringe units (U-100, U-50 or U-30).
How is the concentration calculated?
Concentration in mg/mL = vial mass in mg ÷ BAC water volume in mL. Example: 10 mg ÷ 2 mL = 5 mg/mL. The calculator also reports µg/mL by multiplying by 1 000.
How is the dose volume calculated?
Dose volume in mL = target dose in mg ÷ concentration in mg/mL. Example: 0.25 mg ÷ 5 mg/mL = 0.050 mL per dose, which is 5 insulin marks on a U-100 syringe.
How are insulin units calculated?
On a U-100 syringe, 1 mL = 100 units, so each mark = 0.01 mL. Units = volume in mL × 100. On U-50, 1 mL = 50 units; on U-30, 1 mL = 30 units.
Can I type the vial mass in µg?
Yes. The calculator auto-converts µg to mg internally (10 000 µg = 10 mg). The result is also reported in µg per dose and µg/mL for convenience.
Why does the calculator default to 10 mg ÷ 2 mL = 5 mg/mL?
5 mg/mL is the most common research concentration and produces a readable 0.05 mg/U on a U-100 syringe. The defaults are math examples, not recommended doses.
Can I work backwards from a target dose?
Yes — type the target dose per administration and the calculator shows the mL and insulin units for that dose, given the concentration you entered.
Does the calculator handle peptide blends?
No. The dosage calculator handles a single peptide in one vial. For two-peptide combinations (for example BPC-157 + TB-500 in one vial), use the peptide mixing calculator.
Is this calculator medical advice?
No. The peptide dosage calculator is a math tool. It does not give medical advice, recommend a dose for any person, or model pharmacokinetics. The presets are user-input examples only.
Can I share my inputs with someone else?
Yes. Click Copy share link. The button copies a URL with your vial mass, BAC water volume, target dose and syringe scale embedded; opening that URL restores the same values.
Related Peptide Calculators
The peptide dosage calculator on this page performs mathematical conversions only. It does not give medical advice, recommend a dose for any person, or model pharmacokinetics. The preset values shown are user-input examples only, not recommended doses. Read the full medical disclaimer and the site disclaimer.