Last updated: October 2026
Trenbolone Dosage Calculator
Quick answer: A 200 mg/week dose over 3.5 shots from a 100 mg/mL vial is 0.571 mL (57.1 units) per shot, ≈ 174 mg active hormone/week. mL = (weekly mg ÷ shots) ÷ mg/mL.
Injectable ester — about 87% of each mg is Trenbolone; the calculator converts dose → mL, units and active mg. Aromatizes: No. Liver-strain (17α-alkylated): No. Half-life: Acetate ≈ 3 days (textbook); Enanthate.
About this calculator
Trenbolone is a potent 19-nor injectable that does not aromatize. It comes as two esters with very different timing: acetate (≈87% active hormone, ~3-day depot) and enanthate (≈71% active hormone). For trenbolone enanthate, no FDA label, monograph, or peer-reviewed PK study establishes a half-life, so this calculator shows the exact dose-to-volume conversion but omits the enanthate timeline rather than printing an uncited number.
Trenbolone is a 19-nortestosterone derivative far more potent per milligram than testosterone. It is sold mainly as the fast acetate and the slower enanthate esters, and the choice of ester changes both the active fraction and how often it is injected.
How the injection-volume maths works
Acetate is about 87% trenbolone by weight (270.4 ÷ 312.4) and enanthate about 71% (270.4 ÷ 382.5), so the same labelled dose delivers different active milligrams. The calculator applies the correct factor for whichever ester you select.
How to use this calculator
Start with the ester, because it decides both the active fraction and how the depot behaves. Then enter the weekly milligrams, the strength printed on the vial label, and the number of shots that week is divided into. Three figures come back: the draw in mL, the same draw as marks on a U-100 insulin syringe, and the milligrams of trenbolone itself that each shot carries.
Worked examples
Weekly dose: 200 mg · Concentration: 100 mg/mL · Injections/week: 3.5
57.14 mg/shot ÷ 100 = 0.571 mL (57.1 units) · active ≈ 174 mg/week
Weekly dose: 300 mg · Concentration: 200 mg/mL · Injections/week: 2
150 mg/shot ÷ 200 = 0.75 mL (75 units) · active ≈ 261 mg/week
Half-life & clearance
Illustrative single-dose elimination by half-life (t½ ≈ 3 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.
Trenbolone acetate has a short (~3-day) depot, so it is injected frequently; enanthate releases more slowly, but because no peer-reviewed study establishes its half-life we show the conversion without a timeline for that ester — a deliberate medical-honesty choice.
How to interpret your result
Read the mL figure as the line to draw to on the barrel, and the unit figure as the count of tick marks on a 100-unit syringe. The active-milligram figure is what separates acetate from enanthate: equal label doses carry different amounts of real trenbolone, so compare esters on that number rather than on the label. The timing figure is a decay reference for the acetate only.
Aromatization, liver & monitoring
Trenbolone does not aromatize — it is progestogenic rather than estrogenic, so classic anti-estrogens do not address its side effects. It is not 17α-alkylated, so liver strain is not the headline concern; cardiovascular and neurological effects are.
Common mistakes
Mixing up the esters is the big one: a 100 mg/mL acetate vial and a 200 mg/mL enanthate vial give very different draw volumes for the same labelled dose. Set the ester first, then read the mL.
Trenbolone at a glance
| Property | Trenbolone |
|---|---|
| Form | Injectable (oil/suspension) |
| Active fraction | 0.87 (esterFactor) |
| Half-life | Acetate ≈ 3 days (textbook); Enanthate — not reliably established in the literature |
| Aromatizes | No — trenbolone does not convert to estrogen (it is progestogenic instead). |
| Liver (17α-alkylated) | No (not 17α-alkylated). |
| Approx. detection | Metabolites detectable for weeks. |
Trenbolone acetate and enanthate draw table
The rows below apply the calculator’s arithmetic to each trenbolone ester at one label strength, split over two shots a week. They are worked examples of the conversion, not a recommendation to use any amount. Active mg is the milligrams in the shot multiplied by that ester’s factor, so the enanthate rows show a smaller real-hormone figure than the acetate rows for the same label dose.
| Ester | Vial | Weekly dose | Shots/week | mL per shot | Units | Active per shot |
|---|---|---|---|---|---|---|
| Acetate | 100 mg/mL | 200 mg | 2 | 1 mL | 100 | 87 mg |
| Acetate | 100 mg/mL | 300 mg | 2 | 1.5 mL | 150 | 130.5 mg |
| Enanthate | 200 mg/mL | 200 mg | 2 | 0.5 mL | 50 | 71 mg |
| Enanthate | 200 mg/mL | 300 mg | 2 | 0.75 mL | 75 | 106.5 mg |
How trenbolone differs from NPP
Trenbolone and NPP are both 19-nor compounds, so they are easy to confuse, but the page data separates them on four points. Aromatization: trenbolone does not convert to estrogen at all, while NPP aromatizes partially and weakly. Liver: neither is 17α-alkylated, so both sit on the injectable side of that question. Half-life evidence: trenbolone acetate has a textbook figure of about 3 days and trenbolone enanthate has no established figure, whereas the roughly 2.7 days for NPP comes from peer-reviewed pharmacokinetics (Minto 1997). That gap decides how much weight each timing chart can bear. Active fraction: trenbolone acetate is 0.87 and enanthate 0.71, against 0.67 for NPP, so a label milligram of trenbolone acetate carries a larger share of real hormone than a label milligram of NPP. The method is identical for both; the selector at the top only swaps the factor, the ester options and the timing reference.
Frequently asked questions
Related guides
Other compounds
Other calculators
References
- PubChem — trenbolone (molecular weight), CID 25015
- PubChem — trenbolone acetate (molecular weight), CID 66359
- PubChem — trenbolone enanthate (molecular weight), CID 20112041
- 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
Milligrams per shot are the weekly total divided by the shots. Divide that by the vial strength for mL, then multiply the mL by 100 for U-100 units. Active trenbolone per shot is the shot milligrams times the ester factor: 0.87 for acetate (270.4 ÷ 312.4) and 0.71 for enanthate (270.4 ÷ 382.5), with both molecular weights taken from PubChem. The acetate timing curve uses ke = ln2 ÷ t½ and the five half-life rule of thumb. 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.