Last updated: October 2026
Anavar Dosage Calculator
Quick answer: A 40 mg daily dose split into 2 from 10 mg tablets is 2 tablet(s) per dose. Tablets = (daily mg ÷ doses) ÷ mg per tablet.
Oral, non-esterified — every mg is active drug; the calculator converts dose → tablets. Aromatizes: No. Liver-strain (17α-alkylated): Yes. Half-life: ≈ 9.4–10.4 h (≈ 13 h in older adults).
About this calculator
Anavar (oxandrolone) is an oral, non-esterified anabolic steroid, so 100% of each milligram is active compound — there is no ester to subtract. This calculator converts a daily dose into tablets per dose from your tablet strength, and shows the half-life timing that governs how the dose is usually split through the day.
Oxandrolone is a comparatively mild oral steroid often chosen for its low androgenic profile and modest water retention. Because it is non-esterified, the only conversion the calculator needs is dose-to-tablets — there is no ester weight to account for.
How the tablet maths works
There is no ester to subtract: a 20 mg dose is 20 mg of oxandrolone. The calculator simply divides your daily dose by your tablet strength and by the number of times you split it, so half-tablet results mean a tablet would need splitting.
How to use this calculator
Enter your daily dose, your tablet strength (mg per tablet), and how many times a day you split the dose. The result updates instantly with tablets per dose and the per-dose milligrams.
Worked examples
Daily dose: 40 mg · Tablet: 10 mg · Doses/day: 2
20 mg/dose → 20 ÷ 10 = 2 tablet(s) per dose
Daily dose: 50 mg · Tablet: 25 mg · Doses/day: 2
25 mg/dose → 25 ÷ 25 = 1 tablet(s) per dose
Anavar dose chart
Common doses at 10 mg tablets, split twice daily (each row is the calculator’s arithmetic worked out):
| Daily dose | Tablet | Doses/day | Tablets/dose |
|---|---|---|---|
| 5 mg | 10 mg | 2 | 0.25 |
| 10 mg | 10 mg | 2 | 0.5 |
| 20 mg | 10 mg | 2 | 1 |
| 30 mg | 10 mg | 2 | 1.5 |
| 40 mg | 10 mg | 2 | 2 |
| 50 mg | 10 mg | 2 | 2.5 |
Half-life & clearance
Illustrative single-dose elimination by half-life (t½ ≈ 0.41 days). Each marker is one half-life; after ~5 the dose is essentially cleared.
With a ~9–10 hour half-life, oxandrolone clears within roughly two days and is commonly divided into two daily doses to keep levels steadier. It is the only compound in this set with a clean peer-reviewed human half-life (Karim 1973), measured with a radiolabelled tracer.
How to interpret your result
The result is the number of tablets to take per dose. Fractions mean a tablet would need splitting — round to what your tablet strength allows. The half-life figure is a pharmacokinetic timing reference only.
Aromatization, liver & monitoring
Oxandrolone does not aromatize, so it carries little estrogenic activity. It is 17α-alkylated, however, so it passes through the liver intact and can shift liver enzymes and cholesterol — bloodwork is not optional, even on a "mild" oral.
Common mistakes
A frequent mistake is assuming "mild" means "no monitoring needed". Oxandrolone still suppresses natural testosterone and worsens the cholesterol ratio; the tablet maths is simple but the monitoring is not.
Anavar at a glance
| Property | Anavar |
|---|---|
| Form | Oral |
| Active fraction | 1.00 (no ester) |
| Half-life | ≈ 9.4–10.4 h (≈ 13 h in older adults) — Karim 1973, a peer-reviewed radiolabelled PK study |
| Aromatizes | No — already 5α-reduced, not an aromatase substrate. |
| Liver (17α-alkylated) | Yes — 17α-methylated, so it passes through and stresses the liver. |
| Approx. detection | ~12–18 days (longer via 18-nor markers). |
Anavar ester and half-life
Anavar is oxandrolone, an oral compound with no ester, so the active factor is 1.0 and a 20 mg dose is 20 mg of oxandrolone. Its half-life is about 9.4 to 10.4 hours (roughly 13 hours in older adults) from Karim 1973, a radiolabelled study in people, which makes it the only compound in this set with a clean peer-reviewed human figure. By the five half-life rule it clears within about two days. It is 17α-methylated, so unlike the injectables it passes through the liver, and the metabolite is detectable for roughly 12 to 18 days, longer through 18-nor markers.
Anavar dose range in tablets
The reference range for Anavar runs from 5 mg to 50 mg a day. Split into 2 doses, that is 2.5 mg to 25 mg per dose, or 0.25 to 2.5 tablets per dose with 10 mg tablets. Every milligram is active oxandrolone, so the active figure always equals the dose. These are conversions of the numbers shown, not a recommendation.
Anavar tablet notes
There is no vial and no syringe here, so the working unit is the tablet. The calculator divides the daily dose by the number of doses, then by the strength printed on the tablet, to give tablets per dose. A result of 2 means two whole tablets, 1 means one, and 0.5 means a half tablet, which only works if the tablet can be split cleanly. Strengths of 10 mg are the starting point on the page, and the second example uses a 25 mg tablet to show how a bigger tablet shrinks the count. Quarter-tablet results, such as 0.25, are a sign to pick a different tablet strength or a different number of doses.
Anavar worked examples
| Example | Daily dose | Tablet | Doses/day | mg per dose | Tablets per dose | Splitting |
|---|---|---|---|---|---|---|
| Anavar example 1 | 40 mg | 10 mg | 2 | 20 mg | 2 | whole tablets |
| Anavar example 2 | 50 mg | 25 mg | 2 | 25 mg | 1 | whole tablets |
| Anavar example 3 | 15 mg | 10 mg | 3 | 5 mg | 0.5 | half tablets |
Anavar questions answered
Frequently asked questions
Related guides
Other compounds
Other calculators
References
- Karim A et al. Oxandrolone disposition and metabolism in man. Clin Pharmacol Ther 1973;14(5):862–869 (PMID 4729902)
- PubChem — oxandrolone (molecular weight), CID 5878
- 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.