How to Use the Blackwell BioLabs Peptide Calculator: Step-by-Step Tutorial

Go to blackwellbiolabs.com/calculator. No account or signup is needed to use the calculator. You will see a 3-step progress bar at the top (Compound → Dose → Results) and the first step already loaded.

The calculator works on any device: phone, tablet, or desktop. All calculations happen instantly in your browser as you change inputs.

The first screen asks you to pick a compound. You have two options:

Option A: Use a preset compound

The calculator has presets for 17 research compounds, including BPC-157, TB-500, GHK-Cu, Ipamorelin, Retatrutide, CJC-1295 w/DAC, Selank, Semax, and more. Tap any compound name to select it.

When you select a preset, the calculator auto-fills the standard vial size for that compound. For example, selecting BPC-157 fills in 10 mg. Selecting TB-500 fills in 20 mg. You can change this value if your vial is a different size.

If you have a lot of compounds to scroll through, use the search bar at the top to filter by name. Type "bpc" and the list narrows to BPC-157 instantly.

Option B: Use a custom compound

Tap the "Custom" chip at the start of the compound list. This lets you enter any compound name (optional) and set the vial amount manually. Use this for any lyophilized peptide not included in the presets.

Setting the vial amount

Below the compound selector, you will see a stepper control labeled "Peptide Amount in Vial." Use the − and + buttons to adjust the vial size, or tap the number and type a value directly. The unit is always mg.

For preset compounds, a note below the stepper shows the standard vial size (e.g. "Standard vial: 10 mg"). If your vial matches, you are good to go.

Once your compound and vial amount are set, tap Continue: Set Dose → to move to Step 2.

Step 2 splits into two sections: dose selection on the left, and bacteriostatic water volume on the right (stacked on mobile).

Choosing a dose

For preset compounds, you will see a row of "Common Doses" chips with the most frequently used research doses for that compound. Tap one to select it.

If you need a dose that is not listed, type it into the "Custom Dose" field below the common doses. When you type a custom value, the common dose selection is cleared automatically.

Next to the custom dose field is a unit toggle: mcg or mg. Tap the unit you want to enter in. The common dose chip labels update in real time to match whichever unit you have selected, so you can compare easily.

Setting BAC water volume

On the right side, you will see preset BAC water volume chips (e.g. 1 mL, 2 mL, 3 mL). Tap one, or type a custom volume in the input field below. The recommended volume for your compound is noted underneath.

Why BAC water volume matters: Adding more water lowers the concentration, which means a larger (easier to measure) syringe draw per dose. Adding less water raises the concentration, which means a smaller draw. For very small doses (under 200 mcg), more BAC water helps you hit a syringe mark you can actually read on the syringe.

When both dose and BAC water are set, tap Calculate Results → to see your results.

This is the payoff screen. It shows everything you need in one view:

The big number: your syringe mark

At the top of the results card, you will see a large number with the label "units on syringe." This is the mark to draw to on a standard 100-unit (1 mL) insulin syringe. Below it, the same volume is shown in mL for reference.

Animated syringe visual

Below the number is an animated SVG syringe that fills to your target mark. The "TARGET" indicator hovers above the barrel at the exact draw point. This gives you a visual preview of how much liquid you are drawing.

If your dose exceeds the syringe capacity (more than 100 units), the syringe turns red and a warning banner appears. In that case, either reduce your dose or add more BAC water to lower the concentration.

Stats row

Below the syringe, a row of stats shows:

Reconstitution Protocol card

Below the stats, there is a collapsible panel labeled "Reconstitution Protocol (Research Reference)." Tap it to expand a 6-step guide customized to your specific compound, BAC water volume, and dose:

1. 1Gather lab supplies
2. 2Draw the specified amount of BAC water
3. 3Transfer into the compound vial (along the glass wall, not directly onto powder)
4. 4Swirl gently (never shake)
5. 5Draw to your specific syringe mark for each dose
6. 6Store at 2–8°C, use within 28 days

This protocol updates dynamically based on your inputs. If you selected 3 mL of BAC water and a 500 mcg dose of BPC-157, the protocol says exactly that.

Below the protocol card on the results screen, you will see a row of circular day-of-week buttons: S, M, T, W, T, F, S (Sunday through Saturday).

Tap the days you plan to administer this compound. Selected days light up in the compound's accent color. When you select at least one day, a line appears showing how many weeks the vial will last at that frequency.

For example, if your vial yields 20 doses and you select Monday, Wednesday, and Friday (3 days per week), the calculator shows approximately 6.7 weeks of supply.

This schedule carries over when you save the compound to your Protocol Stack (next section).

Below the day schedule on the results screen, there is a button labeled Add to Protocol.

What it does: It saves this compound, dose, syringe mark, and schedule to your account's Protocol Stack, so you can reference it any time from your account dashboard without re-running the calculator.

First time? You will need a free account. If you are not logged in, tapping the button will prompt you to sign in or create an account. Creating an account is free and takes about 10 seconds.

If you are already logged in, tapping the button immediately saves the compound. The button changes to a green checkmark with "Added to Protocol!" to confirm.

What gets saved:

If you add the same compound again with a different dose, the existing entry is updated (not duplicated).

At the bottom of the results screen, three buttons appear side by side:

🔗 Share

Copies a URL to your clipboard that encodes your exact calculation: compound, vial size, BAC water volume, dose, and unit. Anyone who opens that link lands directly on the results screen with your configuration pre-loaded. Useful for sharing setups with research colleagues or bookmarking a specific configuration for yourself.

📋 Copy

Copies a plain-text summary of your results to the clipboard, formatted like:

"🧮 BPC-157 Reconstitution — Draw to the 15 mark | 20 doses | $2.50/dose"

Handy for pasting into notes, messages, or research logs.

New Calc

Resets the calculator back to Step 1 so you can run another compound. Your previous "Add to Protocol" action is not affected.

Once you have added one or more compounds, go to blackwellbiolabs.com/account to see your Protocol Stack.

The Protocol Stack is the first section on your account dashboard, sitting right below your profile summary. Each compound you have added appears as its own card with:

Removing a compound: Hover over a card (or tap on mobile) and an ✕ button appears in the top-right corner. Tapping it removes the compound from your active stack.

Adding more compounds: Tap the "+ Add Compound" link at the top-right of the Protocol Stack section. This takes you back to the calculator to run another calculation and add it.

The Protocol Stack is separate from the Research Journal (also on the dashboard), which is a manual log where you can track start/end dates, notes, and status for longer-running protocols.

Use the unit toggle freely. The mcg/mg toggle on Step 2 is not just for custom doses. The common dose chips re-label themselves when you switch units. If you think in milligrams but the compound is typically dosed in micrograms, just flip the toggle and the chips show both.

Bookmark your share link. After you finalize a calculation, tap Share and paste the URL somewhere permanent. That link will always load your exact setup.

Use the Protocol Stack as your reference card. Instead of recalculating every time, save your compounds to the stack and check the syringe gauge on your dashboard. It is faster than re-running the calculator.

The calculator is compound-agnostic in custom mode. If Blackwell BioLabs does not carry a compound you use, select "Custom," enter the vial size and dose, and the math works identically. The reconstitution formula is universal for any lyophilized peptide.