BPC-157 Dosage Calculator

Concerned about side effects? See BPC-157 side effects — what the research documents (honest, sourced, research-use-only).

The BPC-157 dosage calculator on this page does one job well: it turns a milligram vial, the volume of bacteriostatic water you add, and the microgram dose you want into the exact number of units to pull on a U-100 insulin syringe. Because BPC-157 is almost always dosed in micrograms, the single most useful thing this tool does is handle the mcg-to-mg conversion for you and remove the guesswork that causes most reconstitution mistakes.

Below the calculator you will find the exact formulas it runs, a fully worked example built on a real 5 mg vial, guidance on how much water to add, a plain-English walkthrough of reading units on a syringe, and reference tables for both the 5 mg and 10 mg vial sizes stocked on this site. Everything here is written for a subcutaneous, injectable-first audience and is intended as research reference only, not medical advice.

How the BPC-157 dosage calculator works

Reconstitution looks intimidating the first time, but it is only four small pieces of arithmetic. The BPC-157 units calculator runs the same four steps every time, in the same order, so the result is repeatable no matter which vial or dose you enter. Understanding the steps is worth a few minutes because it lets you sanity-check the tool instead of trusting a black box.

Step 1 — Concentration

Concentration is how many milligrams of peptide sit in each millilitre of liquid after you add water. It is simply the vial strength divided by the water volume. A 5 mg vial reconstituted with 3 mL of bacteriostatic water holds 5 ÷ 3 = 1.67 mg per mL. This is the number that changes when you add more or less water; the total amount of peptide in the vial never changes.

Step 2 — Convert your dose from mcg to mg

This is the step people skip, and it is the one that matters most for BPC-157. Doses are quoted in micrograms (mcg), but the concentration is in milligrams (mg). You have to put both on the same scale before dividing. There are 1000 micrograms in a milligram, so a 250 mcg dose is 250 ÷ 1000 = 0.25 mg. Get this wrong and every number after it is off by a factor of a thousand.

Step 3 — Draw volume

Draw volume is the dose divided by the concentration. Using the numbers above, 0.25 mg ÷ 1.67 mg/mL = 0.15 mL. That is the physical amount of liquid you pull into the barrel. On its own, 0.15 mL is hard to eyeball, which is exactly why the next step exists.

Step 4 — Units and doses per vial

A U-100 insulin syringe is graduated in units, where 100 units equals 1 mL. So units = draw mL × 100. Here, 0.15 mL × 100 = 15 units. Separately, doses per vial tells you how long the vial lasts: vial mg ÷ dose mg, rounded down. A 5 mg vial at a 0.25 mg dose gives 5 ÷ 0.25 = 20 doses.

The mcg-to-mg conversion that trips people up

Most peptides used in research are dosed in milligrams, so people build a mental habit around mg. BPC-157 breaks that habit because its commonly reported subcutaneous doses sit in the low hundreds of micrograms. When your dose is written as “250” and your concentration is written as “1.67”, it is dangerously easy to divide 250 by 1.67 and arrive at a draw of roughly 150 mL — a physically impossible, whole-syringe-times-over amount that should immediately tell you a unit mismatch happened.

The fix is mechanical: always convert the dose to milligrams first. Move the decimal three places to the left, or divide by 1000. Keep this quick-reference in view while you work.

Worked example: 5 mg vial, 3 mL water, 250 mcg dose

Let’s run the exact configuration this site’s catalog uses as its default for BPC-157, step by step, so you can see every number line up. Inputs: a 5 mg vial, 3 mL of bacteriostatic water, a target dose of 250 mcg, drawn on a U-100 syringe.

1. Concentration: 5 mg ÷ 3 mL = 1.67 mg/mL.
2. Convert the dose: 250 mcg ÷ 1000 = 0.25 mg.
3. Draw volume: 0.25 mg ÷ 1.67 mg/mL = 0.15 mL.
4. Syringe units: 0.15 mL × 100 = 15 units.
5. Doses per vial: 5 mg ÷ 0.25 mg = 20 doses.

Notice how the units land on a clean, easy-to-read mark. That is not luck — 3 mL is a sensible dilution for a small vial dosed in micrograms, which is one reason it is used as the default here.

How much bacteriostatic water should you add?

There is no single correct water volume; there is only a range that makes measuring easy and keeps the liquid inside the vial. Remember that water changes concentration, not potency. Adding more water spreads the same peptide across more liquid, so each dose becomes more units on the syringe (easier to measure precisely). Adding less water concentrates it, so each dose becomes fewer units (harder to measure precisely).

Two practical limits bracket the useful range. First, the water has to physically fit inside the vial — 5 mg and 10 mg BPC-157 vials are small, and their headroom is typically around 2 to 3 mL, so very large fills are not an option. Second, you want a dose that lands on a readable number of units. A dose that works out to fewer than about 2 to 3 units is easy to under- or over-draw; a dose above roughly 40 to 50 units may not fit in one pull on a small barrel. For a 5 mg vial dosed at 250 mcg, 2 to 3 mL keeps you comfortably in that sweet spot.

Reading units on a U-100 syringe

The “U-100” on an insulin syringe means it is calibrated so that 100 units of liquid equal 1 mL. Each single unit is therefore 0.01 mL. That relationship is the whole reason the calculator multiplies draw volume by 100 — it converts the millilitres your math produced into the units printed on the barrel.

To pull the worked-example dose, you would fill to the 15-unit line, which is 0.15 mL. The most common reading error is confusing units with millilitres: a person aiming for “0.15” reads the 0.15 mL point as if the barrel were marked in mL, when the number they actually want is 15 on the unit scale. Always dose by the unit marks, and let the calculator tell you which mark to stop at. If your syringe is marked in half-units, you can measure doses like 7.5 units precisely; if it is only marked in whole units, round your water volume so doses land on whole numbers.

BPC-157 units by vial size (5 mg and 10 mg)

This site stocks BPC-157 in 5 mg and 10 mg vials. The table below shows the concentration and the units for a 250 mcg dose across sensible water volumes for each, plus how many 250 mcg doses each vial holds. Use it as a quick lookup, and use the calculator above for any dose or volume not listed.

Two things stand out. The 10 mg vial at 1 mL gives only 2.5 units per 250 mcg dose — technically correct, but so concentrated that small measurement slips matter a lot, which is why a little more water is usually easier to work with. And doses-per-vial doubles from 20 to 40 when you move from the 5 mg to the 10 mg vial, because it holds twice the peptide, regardless of how much water you add.

If you want to change the dose rather than the water, here is how the units shift on the default 5 mg + 3 mL (1.67 mg/mL) setup.

Mistakes the BPC-157 units calculator catches

A calculator is most valuable when it stops an error before it happens. These are the four that come up most often with a peptide dosed in micrograms.

• The thousand-fold unit slip. Dividing a raw 250 (mcg) by a 1.67 (mg/mL) concentration without converting first. The calculator forces both onto the milligram scale, so the draw comes out as 0.15 mL instead of an impossible 150 mL.
• Drawing millilitres as if they were units. Reading 0.15 on the barrel instead of stopping at the 15-unit mark. The tool reports the answer in units precisely so there is nothing to reinterpret.
• Assuming water changes strength. Believing that more water means a weaker dose. It does not change the milligrams you inject once you re-measure the units — it only changes how many units that same dose occupies.
• Not planning the vial. Forgetting to check doses-per-vial before starting, then running short mid-schedule. Seeing “20 doses” up front lets you plan how long a vial lasts.

What BPC-157 is studied for

BPC-157 is a synthetic pentadecapeptide — a 15-amino-acid chain — derived from a fragment of a protein found in gastric juice. In the laboratory it has been studied primarily in animal models, where researchers have examined it for tissue repair, tendon and ligament healing, and protection of the gastrointestinal tract. It is commonly run subcutaneously in the low hundreds of micrograms in those settings, which is why microgram dosing and careful reconstitution matter so much here.

Human clinical evidence remains limited, and BPC-157 is handled as a research compound rather than an approved therapy. This page covers only the arithmetic of preparing a known milligram vial to a chosen microgram dose, not a dosing protocol. For documented, compound-specific dosing ranges and references, see the linked protocol library rather than relying on the calculator alone.

Run your numbers

Enter your own vial size, water volume, and target dose into the BPC-157 dosage calculator above and it will return concentration, draw volume, units, and doses per vial instantly. When you want the reasoning behind a specific configuration — or want to double-check a number in plain language — ask the OpenPeptide assistant. For documented, compound-specific specifics, see the single-peptide dosage protocols, and for a full walkthrough of mixing technique, storage, and syringe handling, read the peptide reconstitution guide.