Last updated: October 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
Equipoise is sold as a single ester, so there is nothing to select: enter the weekly milligrams, read the strength off the vial, and say how many shots the week is divided into. Because vials come in more than one strength, the same total can produce very different volumes, and the result shows the mL, the U-100 units, and the boldenone content of each shot.
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
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
Compare the mL line with the vial you are holding, because a stronger vial means a smaller draw for the same total. The active figure stays constant across strengths since it depends only on the milligrams and the ester factor. The timing reference is a decay curve from a compiled half-life, so treat it as a rough guide to how slowly a long undecylenate depot clears.
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. |
Equipoise draw table at 200 and 300 mg/mL
Equipoise vials are found at more than one strength, so the rows below hold the ester constant and vary only the concentration, with each week split into two shots. They demonstrate the calculator’s arithmetic and are not a suggestion to use any amount. Notice that the active milligrams do not change between strengths; only the draw volume does.
| Ester | Vial | Weekly dose | Shots/week | mL per shot | Units | Active per shot |
|---|---|---|---|---|---|---|
| Undecylenate | 200 mg/mL | 300 mg | 2 | 0.75 mL | 75 | 94.5 mg |
| Undecylenate | 200 mg/mL | 400 mg | 2 | 1 mL | 100 | 126 mg |
| Undecylenate | 300 mg/mL | 300 mg | 2 | 0.5 mL | 50 | 94.5 mg |
| Undecylenate | 300 mg/mL | 400 mg | 2 | 0.667 mL | 66.7 | 126 mg |
How Equipoise differs from Deca
Equipoise (boldenone undecylenate) and Deca (nandrolone decanoate) are both injectable esters that are not 17α-alkylated, so neither page raises the liver flag that oral compounds do. Aromatization is the first difference: Equipoise is a partial aromatase substrate, at roughly half the rate of testosterone by estimate and with an atypical estrogen profile, while Deca aromatizes weakly and is mainly progestogenic. The second is the half-life evidence. Equipoise carries a compiled figure of about 14 days for the human depot plus a measured 123 hours from an equine study, which comes with a species caveat. Deca’s 6 to 12 days comes from the nandrolone monograph, with Minto 1997 supplying the free-nandrolone clearance. The third is the active fraction: 0.63 for Equipoise against 0.64 for Deca, close enough that ester choice barely moves the active milligrams between them at the same label dose. Both pages share the arithmetic, so the selector at the top changes the factor and timing reference, not the method.
Equipoise ester and half-life
Equipoise began as a veterinary product and uses an exceptionally long undecylenate ester. The ester is over a third of the molecule, so the active factor is 286.4 ÷ 452.7, which rounds to 0.63, the lowest here. The human depot half-life is a compiled figure of about 14 days. The one measured value is 123 hours, about 5.1 days, from a horse study (Soma 2007), so it carries a species caveat. Boldenone is a partial aromatase substrate, roughly half the rate of testosterone by estimate, and the long depot keeps it detectable for months.
Equipoise dose range in mL and units
The reference range for Equipoise runs from 200 mg to 600 mg a week. Split into 3 shots, that is 66.7 mg to 200 mg per shot. At 250 mg/mL that is 0.267 mL to 0.8 mL per shot, or 26.7 to 80 units on a U-100 syringe. At 300 mg/mL that is 0.222 mL to 0.667 mL per shot, or 22.2 to 66.7 units on a U-100 syringe. Each shot carries 42 mg to 126 mg of active boldenone, which is the shot multiplied by 0.63. These are conversions of the numbers shown, not a recommendation.
Equipoise injection volume notes
Equipoise is commonly supplied at 200 to 300 mg/mL, and the first two worked examples use 250 mg/mL because it falls in the middle of that range. At 250 mg/mL, 250 mg is a full 1 mL, so a 500 mg week in two shots is a 1 mL draw, the top mark of a 1 mL syringe. A week with a higher total, or a weaker vial, can pass 100 units in one shot, and the table then shows why the week is divided into more shots. Check the label before every draw, since 200, 250 and 300 mg/mL vials look alike on the shelf and give three different volumes for one dose.
Equipoise worked examples
| Example | Weekly dose | Vial | Shots/week | mg per shot | mL per shot | Units | Active per shot |
|---|---|---|---|---|---|---|---|
| Equipoise example 1 | 300 mg | 250 mg/mL | 2 | 150 mg | 0.6 mL | 60 | 94.5 mg |
| Equipoise example 2 | 500 mg | 250 mg/mL | 2 | 250 mg | 1 mL | 100 | 157.5 mg |
| Equipoise example 3 | 600 mg | 300 mg/mL | 3 | 200 mg | 0.667 mL | 66.7 | 126 mg |
Equipoise questions answered
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 — 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
Take the weekly total, divide by the shots to get milligrams per shot, divide by the vial strength to get mL, then multiply by 100 to express it in U-100 units. Boldenone content is the shot milligrams times 0.63, the ratio of the parent molecular weight to the undecylenate ester (286.4 ÷ 452.7), both from PubChem. The clearance curve applies ke = ln2 ÷ t½ and stops at five half-lives. 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.