Last updated: June 2026
Winstrol Dosage Calculator
Quick answer: A 50 mg/week dose over 2 shots from a 50 mg/mL vial is 0.5 mL (50 units) per shot, ≈ 50 mg active hormone/week. mL = (weekly mg ÷ shots) ÷ mg/mL.
About this calculator
Winstrol (stanozolol) comes as oral tablets and as an injectable aqueous suspension — neither is esterified, so every milligram is active compound in both forms. Switch the form toggle to convert either a daily oral dose into tablets, or an injected dose into mL and syringe units. The injectable is a micro-crystal suspension that dissolves slowly rather than a classic oil ester. No ester — esterFactor = 1.00 (every milligram is active compound).
How to use this calculator
Enter your weekly dose, the concentration printed on your vial (mg/mL), and how many injections per week. The result updates instantly with the mL to draw, the U-100 syringe units, and the active-hormone milligrams delivered.
Worked example
Weekly dose: 50 mg · Concentration: 50 mg/mL · Injections/week: 2
25 mg/shot ÷ 50 = 0.5 mL (50 units) · active hormone ≈ 50 mg/week
How to interpret your result
The result is the volume to draw per injection and its mark on a U-100 syringe. The active-hormone figure shows how much actual Winstrol that ester delivers — useful when comparing esters. The half-life figure is a pharmacokinetic timing reference only. For oil depots it is the absorption-limited release of the ester, not the cleared parent hormone.
Winstrol at a glance
| Property | Winstrol |
|---|---|
| Form | Oral & injectable |
| Active fraction | 1.00 (no ester) |
| Half-life | Oral ≈ 9 h; injectable suspension ~24 h nominal but acts as a multi-day depot |
| Aromatises | No — pyrazole-fused A-ring, non-aromatisable. |
| Liver (17α-alkylated) | Yes — 17α-methylated (both oral and injectable). |
| Approx. detection | ~10 days for primary metabolites; longer with WADA long-term methods. |
Frequently asked questions
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References
- Soma LR et al. Stanozolol & boldenone PK in horses. J Vet Pharmacol Ther 2007 (PMID 17348894) — species caveat
- Baselt R. Disposition of Toxic Drugs and Chemicals in Man, 8th ed. (2008) — stanozolol detection
- Kicman AT. Pharmacology of anabolic steroids. Br J Pharmacol 2008;154(3):502–521
- PubChem — molecular weights (parent hormone & ester), per compound CID
- WADA — anti-doping scientific research & detection resources
Citations are provided for transparency and education. They do not imply the cited authors or bodies endorse this tool. Anabolic steroid use carries real health risks — always consult a qualified clinician.
How this is calculated
For injectables the calculator divides your weekly dose by the number of injections, then by the vial concentration, to get the mL per shot — and multiplies by 100 for U-100 syringe units. The active-hormone milligrams are the dose multiplied by the esterFactor (the parent hormone's molecular weight divided by the full ester's molecular weight). For orals it divides the daily dose by your doses-per-day and tablet strength to get tablets per dose. It is arithmetic only — nothing you enter is stored or sent anywhere, and the result is not medical advice or an endorsement of anabolic steroid use.