Free, no sign-up, nothing saved: reconstitution and dilution math, a multi-compound blend calculator, and a cycle planner with one-click calendar export. Work in mg or mcg for standard 3 ml cartridges and multi-dose vials.
For research and educational reference only. Preppin Peppers sells laboratory hardware and materials (reconstitution pens, cartridges, and bacteriostatic water); it does not sell peptides or any substance for consumption. All content on this site, including the calculators and all reconstitution, dilution, blending, and compound reference material, is educational only. It is not medical, health, veterinary, dosing, or compounding advice, has not been evaluated by the FDA, and is not intended to diagnose, treat, cure, or prevent any condition, or for human or animal use. You are solely responsible for complying with the laws and regulations that apply where you live. Consult a licensed professional before making any health decision. Use of this site and its tools is at your own risk.
Peptide Reconstitution Calculator
New here? Enter what is in your vial and how much water you added; the calculator shows the concentration and how many units to draw. Hover the ? marks for help.
Mix a vial, then see the concentration and exactly how much to draw for a target amount. Switch the target between mg and mcg.
Concentration?How concentrated the mixed solution is: milligrams of compound per millilitre.5.0 mg/ml
Volume to draw?The millilitres you would draw to get your target amount.0.05 ml
Draw on a U-100 scale?The same volume in units on a standard U-100 syringe or pen. 1 unit = 0.01 ml.5 units
Per unit?How much compound one unit on a U-100 syringe delivers at this concentration.50 mcg
Draws per vial?How many target-size draws one vial holds, rounded down.10
5 units on a U-100 syringe scale · over 100 units, split into more than one draw
1 unit on a U-100 syringe or pen = 0.01 ml. 1 mg = 1000 mcg. Illustrative fluid math for research reconstitution.
Common reconstitution starting points
Concentrations frequently referenced in research material. These are reference points for the mixing math, showing how an example amount converts to units at that concentration. Not dose recommendations. Select a row to load it into the calculator above.
Compound
Vial
Water
Conc.
→ units
BPC-157
5 mg
2 mL
2.5 mg/mL
250 mcg → 10 u
TB-500
10 mg
3 mL
3.3 mg/mL
2 mg → 60 u
Ipamorelin
5 mg
2 mL
2.5 mg/mL
200 mcg → 8 u
CJC-1295
2 mg
2 mL
1 mg/mL
100 mcg → 10 u
Sermorelin
5 mg
2 mL
2.5 mg/mL
200 mcg → 8 u
Tesamorelin
10 mg
2 mL
5 mg/mL
1 mg → 20 u
How to reconstitute your vial
Reconstitution is adding liquid, almost always bacteriostatic water, to a freeze-dried (lyophilized) compound so it can be measured accurately.
Clean both stoppers. Wipe the bacteriostatic water vial and the compound vial with an alcohol swab before puncturing either one.
Draw the water first. Pull the full amount of bacteriostatic water into the syringe before adding anything to the compound vial.
Add the water slowly. Aim the stream down the inside wall of the vial instead of blasting the powder directly.
Swirl gently. Roll or swirl the vial until the powder dissolves fully. Never shake it hard.
Refrigerate after mixing. Keep the reconstituted vial cold and away from light unless the label says otherwise.
Get your target amount from a licensed provider. This calculator handles the arithmetic, not the protocol.
How the math works
The compound dissolves evenly in the water you add, so the concentration is simply the milligrams in the vial divided by the millilitres of water. U-100 syringes are marked in units, and 100 units equal 1 ml. The three formulas this calculator uses:
Concentration (mg/ml) = vial mg ÷ water ml
Units to draw = (target mcg ÷ (vial mg × 1000)) × water ml × 100
Draws per vial = (vial mg × 1000) ÷ target mcg, rounded down
Example: a 5 mg vial reconstituted with 2 ml of bacteriostatic water is 2.5 mg/ml, or 25 mcg per unit. A 250 mcg target is 10 units on a U-100 syringe (0.10 ml), and the vial holds 20 draws.
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Peptide Cycle & Supply Planner
Add a card per compound, set the amount, days, and cycle length, then export the schedule to your calendar. Switch Dosing to Ramp for a titration. Hover any ? for help.
Imports into Google Calendar, Apple Calendar and Outlook.
Generated in your browser and never stored. For research planning and supply estimation only, not dosing guidance.
DIY Peptide Blend Calculator
Combine two or more compounds into one cartridge and see the draw for each. Set the cartridge size, add each compound with its vial and per-dose amount, then pick the doses per cartridge. Hover any ? for help.
Solution in cartridge?The combined volume of the reconstituted solutions you draw into the cartridge.—
Top-up water?Plain bacteriostatic water added last when Fill cartridge is on. With no top-up this shows the spare room left in the cartridge.—
Each dose (draw)?The volume of one dose in U-100 units and millilitres. With no top-up it is the blended solution divided by doses; with Fill cartridge it is the cartridge size divided by doses.—
Each dose contains—
About filling to full: topping up with water gives a bigger, easier-to-draw dose and finer per-unit control, but it does not make the mix last longer. Reconstituted peptide still keeps only about 4 weeks refrigerated — water does not extend that, and can shorten it for some compounds. To remix less often, make a bigger batch (more vials = more doses), up to what fits in the cartridge and what you finish within ~4 weeks.
Your mixing steps?The physical procedure for your exact numbers: reconstitute each vial on its own, transfer the calculated volume of each solution into the cartridge, then dose from the pen.
Reusing a vial later? A reconstituted vial kept cold (2–8 °C) and dark holds about 4 weeks. ?The 4-week clock starts when you first mix the vial, not when you make each cartridge. Label every vial with its mix date. References range 3–6 weeks; 4 is the conservative default. Rolling leftover into the next cartridge is fine while that vial is inside its own ~4 weeks. ?If a cartridge mixes leftover plus a fresh vial, track the older solution by its own mix date — combining does not reset the clock, and a blend is only as fresh as its oldest part. Do not top up an old vial with a fresh one to extend it. Discard anything cloudy, discolored, or with floaters.
How long a cartridge lasts & when to refill optional
One vial usually makes more than one cartridge. This shows how long a single cartridge lasts at your dosing pace, suggests a batch size that finishes whole vials with no waste, and lists the exact amounts to draw when you refill the cartridge from the same vials over your cycle. Skip it if you only care about one cartridge.
Or make the batch last
weeks
Adds this cartridge to the planner above, so you get every dose date, a calendar file, and a “make the next cartridge” reminder for each refill across the whole cycle.
Assumes each compound dissolves fully and mixes evenly. Shelf life varies by compound and handling; research planning math only, not dosing, compounding, or storage guidance. Confirm your protocol and storage with a licensed provider.
These tools pair with our hardware and consumables.
BlendEdit the recipe in the DIY blend calculator below.
Repeat
repeat every days
Dosing ramp (titration)?A dosing ramp starts at a lower amount and steps up over the cycle — for example weeks 1–4 at 0.25 mg, then weeks 5–8 at 0.5 mg. After the last step, entries continue at the final amount until the cycle ends.
After the last step, the schedule continues at the final amount for the rest of the cycle.
Times per day?How many entries on each scheduled day. Choose 3+ to enter your own number.& notes?Each entry below has a time and an editable note. Notes auto-fill from your settings (compound and dose) and are added to every calendar event. Type your own, or press ↻ to reset it to the auto note. per day
Time and an editable note for each entry — notes auto-fill from your settings and are added to every calendar event. Type to write your own; press ↻ to reset.
Cycle length?How many weeks the schedule runs, or set a goal end date instead.
weeksor
Break after cycle?A scheduled off period after the cycle ends. It is added as a single non-blocking calendar marker on the start day (it will not block out your days), plus a marker on the day the next cycle can start.
weeks
Concentration (mixed)?Vial strength divided by the water you added: milligrams per millilitre after mixing.5.0 mg/ml
Draw per entry?How much to draw for one entry, shown in units and millilitres. With a dosing ramp this shows the range across your steps — see the per-step breakdown below.5 units
Entries this cycle?The total number of scheduled entries across the whole cycle.24
Total peptide used?The total amount of compound the schedule uses over the cycle.6.0 mg
Vials needed for this cycle?How many vials the whole cycle requires, based on your vial strength.1
Left over from your supply?What remains from the vials you already have after the cycle ends.—
Draw per dose—
Each dose contains—
Doses this cycle?The total scheduled doses across the whole cycle.—
Cartridges to make?How many cartridges the cycle needs, based on the doses per cartridge from your blend.—
:
1weeks atmg
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This site sells laboratory hardware and provides research and educational reference only. Nothing here is for human or animal use, and it is not medical or dosing advice. You must be 18+ to enter.
