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.
Injectable ester — about 100% of each mg is Winstrol; the calculator converts dose → mL, units and active mg. Aromatizes: No. Liver-strain (17α-alkylated): Yes. Half-life: Oral ≈ 9 h; injectable suspension ~24 h nominal but acts as a multi-day depot.
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.
Stanozolol is unusual: it is sold both as oral tablets and as an injectable water-based suspension, and neither form is esterified. Use the form toggle to match your preparation — the injectable is commonly 50 mg/mL.
How the injection-volume maths works
There is no ester in either form, so every milligram is active stanozolol. The injectable is a suspension of solid micro-crystals, not an oil ester — but it is still measured in mL by its concentration, so the draw maths is the same.
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 examples
Weekly dose: 50 mg · Concentration: 50 mg/mL · Injections/week: 2
25 mg/shot ÷ 50 = 0.5 mL (50 units) · active ≈ 50 mg/week
Weekly dose: 70 mg · Concentration: 50 mg/mL · Injections/week: 3.5
20 mg/shot ÷ 50 = 0.4 mL (40 units) · active ≈ 70 mg/week
Winstrol dose chart
Common doses at 50 mg/mL, 2 injections/week (each row is the calculator’s arithmetic worked out):
| Weekly dose | mL/shot | Units | Active/week |
|---|---|---|---|
| 25 mg | 0.25 mL | 25 | 25 mg |
| 50 mg | 0.5 mL | 50 | 50 mg |
| 75 mg | 0.75 mL | 75 | 75 mg |
| 100 mg | 1 mL | 100 | 100 mg |
| 125 mg | 1.25 mL | 125 | 125 mg |
| 150 mg | 1.5 mL | 150 | 150 mg |
Half-life & clearance
Illustrative single-dose elimination by half-life (t½ ≈ 1 days). Each marker is one half-life; after ~5 the dose is essentially cleared. For an oil depot the real rise-and-fall is slower (absorption-limited release), so treat this as a timing reference, not a blood-level prediction.
Oral stanozolol has a ~9 hour half-life; the injectable suspension is nominally ~24 hours but behaves as a slow-dissolving depot lasting days. Primary metabolites are detectable for around ten days.
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 or switching concentrations. The half-life figure is a pharmacokinetic timing reference only.
Aromatization, liver & monitoring
Stanozolol does not aromatize. Crucially, both the oral and the injectable forms are 17α-alkylated and hepatotoxic — the injection does not spare the liver, a common and dangerous misconception.
Common mistakes
Assuming injectable Winstrol is liver-friendly is the dangerous error — it is 17α-alkylated like the tablets. For the maths, the suspension is often 50 mg/mL, so small doses are very small volumes.
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 |
| Aromatizes | No — pyrazole-fused A-ring, non-aromatizable. |
| 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
Related guides
Other compounds
Other calculators
References
- Soma LR et al. Pharmacokinetics of stanozolol & boldenone in the horse. J Vet Pharmacol Ther 2007 (PMID 17348894) — species caveat
- PubChem — stanozolol (molecular weight), CID 25249
- Kicman AT. Pharmacology of anabolic steroids. Br J Pharmacol 2008;154(3):502–521
Every citation URL was verified to return HTTP 200. Citations are provided for transparency and education and 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 (1 mL = 100 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, both from PubChem). For orals it divides the daily dose by your doses-per-day and tablet strength to get tablets per dose. Half-life timing uses ke = ln2 ÷ t½ and the ~5-half-life rule of thumb for steady state and clearance. 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.