Calculator for semaglutide reconstitution and per-administration dosing maths. Semaglutide is a licensed prescription-only medicine in the United Kingdom (marketed as Ozempic, Wegovy and Rybelsus). Stackcalc.co.uk does not sell semaglutide and this page is provided for information and research-mathematics purposes only.
For research and educational purposes only. This calculator performs volumetric mathematics on the values you enter; it does not recommend doses or provide medical advice.
Universal peptide & nootropic dose calculator
Standard research pen format: 3 mL total volume, 300 clicks per pen. That’s fixed — so the only thing that changes is how many mg are in your specific pen. mg per click = your pen’s mg ÷ 300.
Vial mode: most research peptide vials are 3 mL borosilicate glass (industry standard — about 99% of compounds ship in this size). Larger compounds like NAD+ or high-mg GHK-Cu sometimes come in 5–10 mL vials. The bacteriostatic water you add must fit inside your physical vial — for a standard 3 mL vial, that’s usually 1–3 mL of BAC water. Tell us the vial’s peptide content (in mg), the BAC water you added, and your target dose — we work out the concentration, the volume to draw, and the syringe units on a U-100 insulin syringe.
Research and educational purposes only. Not medical advice. Not for human consumption. This calculator performs volumetric mathematics on the values you enter; it does not recommend doses. Compounds listed are not licensed as medicines for human use unless stated otherwise.
About Semaglutide
Semaglutide is a GLP-1 receptor agonist developed by Novo Nordisk. It is a licensed prescription medicine in the United Kingdom under several brand names. As a prescription-only medicine, semaglutide can only be lawfully supplied via licensed pharmacy channels under a valid UK prescription. Stackcalc.co.uk is not a pharmacy and does not sell semaglutide.
Published research literature describes semaglutide in extensive clinical trials for type 2 diabetes (Ozempic / Rybelsus), weight management (Wegovy), and other metabolic indications. Mechanism: GLP-1 receptor agonism affecting appetite, gastric emptying, and glycaemic control.
Typical reconstitution / pen formats
| Format | BAC water | Concentration / mg per click | Volume to draw / clicks | For |
|---|---|---|---|---|
| 5mg pen (prefilled, 3ml/300 clicks) | — | 0.017 mg/click | ≈30 clicks for 0.5mg / ≈60 clicks for 1mg | research-format pen |
| 10mg pen (prefilled, 3ml/300 clicks) | — | 0.033 mg/click | ≈15 clicks for 0.5mg / ≈30 clicks for 1mg | research-format pen |
| 20mg pen (prefilled, 3ml/300 clicks) | — | 0.067 mg/click | ≈8 clicks for 0.5mg / ≈15 clicks for 1mg | research-format pen |
Semaglutide dosing observed in research literature
Published clinical-trial titration protocols escalate from 0.25mg weekly (starting), through 0.5mg, 1mg, 1.7mg, to a maintenance of 2.4mg weekly. The escalation is typically over a 16+ week titration period to manage tolerability.
These figures are reported here for completeness of the research-literature picture and do not constitute a dosage recommendation.
Half-life and frequency
Semaglutide has a half-life of approximately 7 days, supporting once-weekly administration. This is the longest of the major GLP-1 family compounds.
Storage and shelf life
Licensed pharmacy products have specific storage instructions printed on the packaging. Refrigerated storage is standard pre-use; some products are stable at room temperature for limited periods once in use.
Frequently asked questions
Is semaglutide legal to buy without a prescription in the UK?
No. Semaglutide is a prescription-only medicine in the UK. Lawful supply requires a valid prescription dispensed through a registered pharmacy. Stackcalc.co.uk does not sell semaglutide.
How does the 3ml/300-click pen format work for semaglutide?
Research-grade semaglutide pens follow the standard 3ml/300-click format. mg per click = pen total mg ÷ 300. For a 10mg pen, that’s 0.033 mg/click — 15 clicks for a 0.5mg dose.
What’s the difference between Ozempic, Wegovy, and Rybelsus?
All three are semaglutide brands from Novo Nordisk. Ozempic and Wegovy are injectable; Rybelsus is oral. Wegovy is licensed for chronic weight management at higher doses; Ozempic is licensed for type 2 diabetes at lower doses.
Why is semaglutide on a research calculator?
The volumetric and click-count mathematics for prefilled research pens are independent of the product’s regulatory status. Researchers working with research-grade semaglutide preparations need accurate dosing maths. This page is for information purposes; clinical use of licensed semaglutide products is a matter for licensed prescribers.
Related compounds and stacks
Where to source research-grade Semaglutide
For UK readers researching Semaglutide, our partner supplier stocks research-grade preparations. (Partner link to be added after the affiliate arrangement is signed.) We do not sell peptides ourselves and are not responsible for any third-party supplier’s product quality, regulatory compliance, or customer service.
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. Always consult a qualified healthcare professional. Not for human consumption.