Last updated: June 2026
Equipoise Dosage Calculator
Quick answer: A 300 mg/week dose over 2 shots from a 250 mg/mL vial is 0.6 mL (60 units) per shot, ≈ 189 mg active hormone/week. mL = (weekly mg ÷ shots) ÷ mg/mL.
Injectable ester — about 63% of each mg is Equipoise; the calculator converts dose → mL, units and active mg. Aromatizes: Yes (partial). Liver-strain (17α-alkylated): No. Half-life: ≈ 14 days human depot (compiled); 123 h measured in an equine PK study (species caveat).
About this calculator
Equipoise (boldenone undecylenate) is a long-ester injectable, originally veterinary. Only about 63% of each milligram is active boldenone — the long undecylenate chain accounts for the rest. This calculator converts a weekly dose into draw volume and syringe units, and shows the long depot half-life.
Boldenone undecylenate began as a veterinary preparation and uses an exceptionally long ester, so only about 63% of each milligram is boldenone — the lowest active fraction in this set. It is commonly supplied at 200–300 mg/mL.
How the injection-volume maths works
The long undecylenate chain is over a third of the molecule’s weight (286.4 ÷ 452.7 = 0.63), so a 300 mg dose delivers about 189 mg of boldenone. The calculator shows both numbers.
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: 300 mg · Concentration: 250 mg/mL · Injections/week: 2
150 mg/shot ÷ 250 = 0.6 mL (60 units) · active ≈ 189 mg/week
Weekly dose: 400 mg · Concentration: 300 mg/mL · Injections/week: 2
200 mg/shot ÷ 300 = 0.667 mL (66.7 units) · active ≈ 252 mg/week
Equipoise 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 |
|---|---|---|---|
| 200 mg | 0.4 mL | 40 | 126 mg |
| 300 mg | 0.6 mL | 60 | 189 mg |
| 400 mg | 0.8 mL | 80 | 252 mg |
| 500 mg | 1 mL | 100 | 315 mg |
| 600 mg | 1.2 mL | 120 | 378 mg |
Half-life & clearance
Illustrative single-dose elimination by half-life (t½ ≈ 14 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.
EQ’s very long ester means a multi-week depot and a slow climb to steady state; a peer-reviewed equine study measured a terminal half-life of ~123 hours, with the species caveat that humans may differ.
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 Equipoise that ester delivers — useful when comparing esters or switching concentrations. The half-life figure is a pharmacokinetic timing reference only.
Aromatization, liver & monitoring
Boldenone aromatizes, though more slowly than testosterone and toward an atypical estrogen profile, so estrogen management can still matter. It is not 17α-alkylated, so it is not directly hepatotoxic; a raised red-cell count is a more typical concern.
Common mistakes
Dosing EQ like a short ester and expecting quick effects is the common error — it can take many weeks to plateau. For the maths, note the low 0.63 active fraction, the lowest here.
Equipoise at a glance
| Property | Equipoise |
|---|---|
| Form | Injectable (oil/suspension) |
| Active fraction | 0.63 (esterFactor) |
| Half-life | ≈ 14 days human depot (compiled); 123 h measured in an equine PK study (species caveat) |
| Aromatizes | Yes (partial) — an aromatase substrate, roughly half the rate of testosterone (estimate; atypical estrogen profile). |
| Liver (17α-alkylated) | No (not 17α-alkylated). |
| Approx. detection | Long — detectable for months due to the slow undecylenate depot. |
Frequently asked questions
Related guides
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References
- Soma LR et al. Pharmacokinetics of stanozolol & boldenone in the horse. J Vet Pharmacol Ther 2007 (PMID 17348894) — species caveat
- PubChem — boldenone (molecular weight), CID 13308
- PubChem — boldenone undecylenate (molecular weight), CID 11954310
- 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.