Last updated: June 2026
Testosterone Enanthate Dosage Calculator
Quick answer: A 125 mg/week dose over 1 shots from a 250 mg/mL vial is 0.5 mL (50 units) per shot, ≈ 90 mg active hormone/week. mL = (weekly mg ÷ shots) ÷ mg/mL.
Injectable ester — about 72% of each mg is Testosterone; the calculator converts dose → mL, units and active mg. Aromatises: Yes. Liver-strain (17α-alkylated): No. Half-life: ≈ 4.5 days (108 h).
About this calculator
Testosterone enanthate is the classic long-acting testosterone ester, very close to cypionate. About 72% of each milligram is testosterone — the enanthate chain makes up the rest. This calculator converts a weekly dose into the draw volume in mL and U-100 syringe units, and shows the active-testosterone milligrams delivered.
Enanthate and cypionate are near-interchangeable in practice; enanthate is one carbon shorter, giving a marginally faster release. It is usually supplied at 250 mg/mL.
How the injection-volume maths works
Each 100 mg of testosterone enanthate carries about 72 mg of testosterone (288.4 ÷ 400.6). The calculator multiplies your labelled dose by 0.72 to show the active figure, so you can compare it directly with cypionate (0.70) or propionate (0.84).
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: 125 mg · Concentration: 250 mg/mL · Injections/week: 1
125 mg/shot ÷ 250 = 0.5 mL (50 units) · active ≈ 90 mg/week
Weekly dose: 200 mg · Concentration: 250 mg/mL · Injections/week: 2
100 mg/shot ÷ 250 = 0.4 mL (40 units) · active ≈ 144 mg/week
Testosterone Enanthate dose chart
Common doses at 250 mg/mL, 2 injections/week (each row is the calculator’s arithmetic worked out):
| Weekly dose | mL/shot | Units | Active/week |
|---|---|---|---|
| 100 mg | 0.2 mL | 20 | 72 mg |
| 125 mg | 0.25 mL | 25 | 90 mg |
| 150 mg | 0.3 mL | 30 | 108 mg |
| 200 mg | 0.4 mL | 40 | 144 mg |
| 250 mg | 0.5 mL | 50 | 180 mg |
| 300 mg | 0.6 mL | 60 | 216 mg |
Half-life & clearance
Illustrative single-dose elimination by half-life (t½ ≈ 5 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.
With a ~4.5-day half-life it sits between propionate and cypionate, reaching steady state in roughly four to five weeks. The figure rests on a drug monograph corroborated by a 2020 pharmacokinetic trial.
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 Testosterone Enanthate that ester delivers — useful when comparing esters or switching concentrations. The half-life figure is a pharmacokinetic timing reference only.
Aromatisation, liver & monitoring
As pure testosterone behind a slow ester, it aromatises to estradiol like any testosterone preparation, so estrogen tracks dose and body fat. It is not 17α-alkylated, so it carries no oral-style liver strain; haematocrit and lipids still merit monitoring.
Common mistakes
Assuming enanthate and cypionate need different maths is the usual confusion — they do not; only the active fraction differs slightly (0.72 vs 0.70). Always read the concentration off your own vial.
Testosterone Enanthate at a glance
| Property | Testosterone Enanthate |
|---|---|
| Form | Injectable (oil/suspension) |
| Active fraction | 0.72 (esterFactor) |
| Half-life | ≈ 4.5 days (108 h) — drug monograph, corroborated by a 2020 PK trial |
| Aromatises | Yes — the testosterone parent aromatises to estradiol. |
| Liver (17α-alkylated) | No (a C17β ester, not 17α-alkylated). |
| Approx. detection | ~3 months (long-chain ester). |
Frequently asked questions
Related guides
Other compounds
Other calculators
References
- PubChem — testosterone enanthate (molecular weight), CID 9416
- PubChem — testosterone (molecular weight), CID 6013
- Pharmacology of testosterone replacement therapy preparations. Transl Androl Urol 2016
- 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.