Not medical advice. Talk to your provider before using any peptide.
Full disclaimerPeptide Schedule Research TeamReviewed Apr 20263 Citations
Confused by peptide dosing math? Enter your vial size, BAC water, and desired dose. The calculator returns exact syringe units, concentration, and doses per vial for 150 peptides. U-100, U-50, and U-30 syringes. Free, no signup.
Summary: Add 2mL BAC water to your 5mg vial. Draw to 10.0 units on a U-100 syringe for a 250mcg dose. This vial will last 20 doses.
Expert-disclosed protocols with verified dosing. Use a protocol to pre-fill your calculator.
A peptide calculator is a free tool that converts three inputs (vial size in mg, BAC water volume in mL, and desired dose in mcg) into the exact number of syringe units to draw. Peptides are short chains of amino acids, and most ship as lyophilized powder that needs reconstitution before use. Instead of dividing concentrations on paper, you type three numbers and get a precise answer in seconds.
This peptide calculator supports 150 peptides with pre-loaded vial sizes and dosing tiers. It works as a peptide mixing calculator (concentration from any BAC water volume) and a peptide syringe calculator (units for U-100, U-50, and U-30 syringes).
The calculator shows four numbers. Concentration is how strong your mixed vial is in mcg per mL. Draw volume is the amount of liquid for one dose. Syringe units is the line to draw to on your syringe. That's the number you actually use. Doses per vialtells you how many injections you'll get before the vial runs out.
Here's the short version: three numbers from your vial, one from your protocol. The calculator handles the rest.
Worked example: You have a 5mg BPC-157 vial. You add 2mL BAC water. You want 250mcg. The calculator shows: 2,500 mcg/mL concentration, 0.100 mL draw volume, 10.0 units on a U-100 syringe. That vial gives you 20 doses.
New to peptides? Peptide Beginner's Guide · How to Reconstitute Peptides
More BAC water makes the solution weaker. You'll draw more units for the same dose. Less BAC water makes it stronger. Fewer units to draw, but harder to measure small doses. Standard reconstitution practice uses 0.9% benzyl alcohol in sterile water (USP <797> compounding guidelines).
Use this as a peptide BAC water calculator: change the water volume in the calculator and watch how concentration and syringe units shift. The following table covers three common setups.
| Vial | BAC Water | Concentration | 250mcg = Units |
|---|---|---|---|
| 5mg | 1mL | 5,000 mcg/mL | 5.0 units |
| 5mg | 2mL | 2,500 mcg/mL | 10.0 units |
| 10mg | 2mL | 5,000 mcg/mL | 5.0 units |
Bottom line: if your draw is under 3 units, use less BAC water. It makes measuring easier. If your draw maxes out the syringe, add more water. Peptide Reconstitution Calculator
It depends on two things: peptide in the vial and dose per injection. Nothing else. BAC water changes the concentration but not the total peptide.
The math is simple: divide total peptide (in mcg) by dose per injection (in mcg). A 5mg vial = 5,000mcg. At 250mcg per dose, that's 20 doses. At 500mcg per dose, that's 10 doses. The calculator works this out for you.
Three steps. First, find the concentration: divide the peptide amount (mg) by the BAC water volume (mL), then multiply by 1,000 to get mcg/mL. Second, find the draw volume: divide your dose (mcg) by the concentration (mcg/mL). Third, convert to syringe units: multiply the draw volume (mL) by 100 for a U-100 insulin syringe.
Example: BPC-157.A 5mg vial with 2mL BAC water = 2,500 mcg/mL concentration. For a 250mcg dose: 250 ÷ 2,500 = 0.10 mL. On a U-100 syringe: 0.10 × 100 = 10 units. The peptide calculator mg-to-mcg conversion and all three steps happen automatically when you enter your numbers.
One mg = 1,000 mcg. That part's easy. Syringe units are different. They measure volume, not weight. A standard U-100 insulin syringe has 100 units per 1 mL, per USP insulin syringe calibration standards. How many units you draw depends on concentration, which is set by how much BAC water you added.
IU (International Units) are used for HGH (human growth hormone) and HCG (human chorionic gonadotropin). They measure biological activity, not weight. The conversion varies by substance. Don't convert between mcg and IU unless you know your peptide's conversion factor. The Peptide Schedule syringe calculator handles U-100, U-50, and U-30 syringes automatically.
Need to convert? Unit Converter · Reverse Calculator (convert syringe units back to mcg) · All Peptide Tools
Most peptides ship as lyophilized (freeze-dried) powder. Before injection, you add sterile bacteriostatic water to dissolve the powder. The amount of water you add sets the concentration, and that determines how many syringe units you draw per dose. The dedicated peptide reconstitution calculator helps you pick the right BAC water volume for your vial size and syringe type. For a full walkthrough, see the reconstitution guide.
Semaglutide, Tirzepatide, and Retatrutide are the most popular weight-loss peptides. They're GLP-1s. They use titration protocols: start low, step up over weeks.
Use the peptide calculator for Semaglutide, Tirzepatide, or Retatrutide by picking them from the dropdown. It auto-fills the vial size and starter dose. For full titration schedules with week-by-week dose escalation, use the dedicated calculators:
Researching which peptide fits your goal? Semaglutide vs Tirzepatide · Best Peptides for Weight Loss · Best Peptides for Muscle Growth · Best Peptides for Healing · GLP-1 Titration Protocols
Running a multi-peptide stack? Blend calculators handle two or more peptides in one vial. Enter the blend ratio, total vial size, and BAC water volume. The calculator breaks down each component's dose and syringe units separately. This also works as a peptide dilution calculator for adjusting concentration. Browse all blend calculators
Every peptide has a dedicated calculator with pre-loaded vial sizes and dose tiers. Each calculator comes pre-loaded with vial sizes, BAC water defaults, and dose tiers. Beginner, moderate, and aggressive. Nothing to look up. Or browse all 150 peptides in the directory.
