The peptide and nootropic dose calculator that gets the maths right.
Free. UK-built. Reconstitution, dosage, and stack calculations in under thirty seconds.
Pick your compound.
BPC-157 is live now. The rest of the compound pages are publishing through this week.
BPC-157 →
Body Protection Compound, 15-amino-acid peptide studied in tissue-repair research literature.
TB-500
Thymosin Beta-4 fragment. Page publishing this week.
GHK-Cu
Copper-binding tripeptide. Page publishing this week.
CJC-1295
Growth-hormone-releasing hormone analogue. Page publishing this week.
Ipamorelin
Selective growth-hormone secretagogue.
MOTS-c
Mitochondrial-derived peptide, metabolic research.
KPV
Tripeptide fragment of alpha-MSH, inflammation research.
Adrafinil
Nootropic, modafinil prodrug. Research-grade.
Info-only (UK prescription-only or unlicensed)
Semaglutide
GLP-1 agonist. Prescription-only in UK.
Tirzepatide
GLP-1/GIP dual agonist. Prescription-only in UK.
Retatrutide
GLP-1/GIP/glucagon triple agonist. Investigational, not licensed.
Modafinil
Wakefulness compound. Prescription-only in UK.
Three calculations. One tool.
Reconstitution
Work out exactly how much bacteriostatic water to add to your vial, and the concentration you end up with.
Dosage
Enter your target dose. Get back the exact volume to draw, the syringe-unit mark to draw to, and a visual syringe diagram showing the draw line.
Stacks
Calculate per-compound doses for named blends like the Wolverine, GLOW, and KLOW stacks — or build your own.
What this is, and what it isn’t.
Stackcalc is a free peptide calculator. It does the reconstitution and dosage maths you’d otherwise be doing in your head with a syringe in one hand and a vial in the other.
We do not sell peptides or nootropics. We do not recommend doses. We do not provide medical advice. Every calculation on this site is for research and educational purposes — the volumes and concentrations we return are the mathematical results of the numbers you enter, nothing more.
🇬🇧 Built in the UK. Designed and operated in Glasgow.
🔬 Research-grade language. Every compound page uses research-only framing. No medical claims.
🔒 No tracking of inputs. Calculator inputs stay in your browser.
Compliance: Stackcalc.co.uk provides calculator tools and information for research and educational purposes only. We do not sell, supply, or recommend peptides, nootropics, or any other compounds. Content on this site does not constitute medical advice. Compounds discussed are not licensed as medicines for human use unless explicitly stated, and several compounds discussed are prescription-only medicines in the United Kingdom — refer to each compound page for specific regulatory status. Always consult a qualified healthcare professional. Not for human consumption.