verified math · no vendor bias
v1.0 · free · open

Free Peptide Calculator built for clarity.

Enter your vial size, BAC water volume, and desired dose. See exactly how many syringe units to draw and a live diagram showing where on the barrel to stop. Supports semaglutide, tirzepatide, retatrutide, BPC-157, and more.

Browse peptidesHow the math works
10
peptides supported
semaglutide, tirzepatide, retatrutide, BPC-157, TB-500, NAD+, ipamorelin, CJC-1295, sermorelin, PT-141
4
syringe scales
U-100, U-50, U-40, U-30 with live diagram
0
data collected
inputs stay in your browser, never on our servers
dose calculator · liveopen formulas
Dose calculatorlive
U-100
Concentration
2.50mg/mL
Injection vol.
0.100mL
Syringe cap.
100units
Draw to10units
02040608010010 units
vial × bac → conc → vol → unitsverified math · open source
The formula

How peptide reconstitution works

01
Enter your vial
Type in the peptide vial size in milligrams. This is printed on the vial or the packaging. Common sizes are 2 mg, 5 mg, and 10 mg.
02
Enter BAC water added
Enter the volume of bacteriostatic water you added during reconstitution, in milliliters. This determines the concentration of your solution.
03
Enter your dose
Enter the dose you want to inject in micrograms. The calculator converts this to the exact number of syringe units to draw, shown on a live diagram.
Catalog

Peptide Reconstitution Calculators

metabolic
Semaglutidecalc →
GLP-1 · weight loss
metabolic
Retatrutidecalc →
Triple agonist · GLP-1 / GIP / glucagon
metabolic
Tirzepatidecalc →
GLP-1/GIP · weight loss
recovery
BPC-157calc →
Cellular · recovery · gut
recovery
TB-500calc →
Cellular · tissue repair
longevity
NAD+calc →
Energy · longevity · mitochondria
longevity
Ipamorelincalc →
GH secretagogue · anti-aging
longevity
CJC-1295calc →
GHRH analog · GH secretagogue
longevity
Sermorelincalc →
GHRH analog · anti-aging
cognitive
PT-141calc →
Melanocortin · sexual function
longevity
Hexarelincalc →
GHRP-6 analog · GH secretagogue · cardioprotective
longevity
GHRP-2calc →
GH secretagogue · ghrelin mimetic · appetite stimulant
longevity
GHRP-6calc →
first-generation GH secretagogue · strongest appetite response
longevity
MK-677calc →
Ibutamoren · oral GH secretagogue
longevity
Epithaloncalc →
AEDG tetrapeptide · telomerase and pineal support
cognitive
Selankcalc →
Tuftsin-derived heptapeptide · anxiolytic and nootropic
cognitive
Semaxcalc →
ACTH(4-10) analog · nootropic and neuroprotective
recovery
LL-37calc →
human cathelicidin · antimicrobial and wound repair
recovery
GHK-Cucalc →
copper tripeptide · skin repair and collagen
cognitive
Melanotan IIcalc →
melanocortin agonist · pigmentation and libido
metabolic
AOD-9604calc →
hGH fragment 176-191 · lipolysis without IGF-1 rise
metabolic
Tesamorelincalc →
GHRH analog · the only FDA-approved visceral fat peptide
recovery
IGF-1 LR3calc →
IGF-1 analog · engineered to escape binding proteins
recovery
PEG-MGFcalc →
PEGylated IGF-1Ec E-domain peptide · contested mechanism
Coverage

Supported peptides and compounds

Each peptide page includes a pre-tuned calculator, a standard dosing protocol table, background on mechanism of action, and a detailed FAQ. More compounds are added regularly.

SemaglutideGLP-1 agonistTirzepatideGLP-1 / GIP agonistRetatrutideTriple agonist · GLP-1/GIP/glucagonBPC-157Recovery peptideTB-500Thymosin Beta-4 fragmentNAD+Longevity coenzymeIpamorelinGH secretagogueCJC-1295GHRH analogSermorelinGHRH analog · anti-agingPT-141Melanocortin · sexual function
What we promise

Three quality controls

01
Verified math
The three-step formula: concentration equals vial divided by BAC water, injection volume equals dose divided by concentration, draw units equals volume times syringe scale. Documented and auditable.
02
No vendor bias
We do not sell peptides. Where supplier references appear they are labeled. They do not influence the calculator or the content.
03
No data sold
Calculator inputs stay in your browser. Anonymous traffic analytics via GA4. No accounts, no tracking of what you dose.
Safety & sources

How we handle information

Peptide research exists in a complicated space, some compounds are FDA-approved, others are research chemicals, most are somewhere in between. Here is how we approach that honestly.

Primary literature only
Every peptide page cites peer-reviewed research, PubMed studies, NEJM clinical trials, and FDA drug labels, with direct links to each source. No vendor marketing, no forum posts, no anecdotal claims treated as evidence.
Regulatory status labeled clearly
We state plainly on every page which compounds are FDA-approved and which are research chemicals. Semaglutide and tirzepatide are approved drugs also sold as research peptides, we don't blur that distinction.
Your provider makes dosing decisions
This site handles the math. Decisions about protocols, sourcing, injection technique, and monitoring for personal use should involve a licensed physician or pharmacist who knows your medical history and can order labs.
Errors get fixed, not buried
The reconstitution formula is three arithmetic steps, documented openly on the about page. If you find an error in the math or the content, use the contact form. We fix mistakes promptly and take accuracy seriously.

Research and informational use only. Nothing on this site constitutes medical advice. Peptides described here may be regulated as research chemicals or prescription medications depending on your jurisdiction. Always consult a licensed healthcare provider before using any injectable substance.