Last updated: May 2026
Testosterone (TRT) Microdosing Calculator for Women
Quick answer: A 0.5 mg daily dose from a 10 mg/mL vial is 0.05 mL = 5 units on a U-100 insulin syringe. Formula: units = (dose mg ÷ concentration mg/mL) × 100.
About this calculator
Calculate low-dose testosterone injection volume for women’s Testosterone (TRT) and microdosing protocols. Enter your dose, vial concentration, and injection frequency to get mL and U-100 syringe units.
How to use this calculator
You need three pieces of information from your prescription and vial label: the vial concentration (mg/mL), your prescribed dose (mg/week), and how often you inject.
Select your mode — Weekly dose if your doctor gave you a weekly amount, Every N days if you inject on a fixed interval (daily or every other day is common for microdosing), or mL → mg to verify what a drawn volume corresponds to.
The calculator defaults to a 0.3 mL insulin syringe — the standard choice for subcutaneous microdose injections. Enter your values and the result updates immediately.
Worked example — women's protocol
Example — twice-weekly subcutaneous injection
Vial concentration: 20 mg/mL (testosterone cypionate, compounded)
Prescribed weekly dose: 5 mg
Injection frequency: twice per week (every 3.5 days)
Per-injection dose = 5 ÷ 2 = 2.5 mg
Draw = 2.5 ÷ 20 = 0.125 mL — 12.5 units on a U-100 insulin syringe
Example — daily subcutaneous injection
Vial concentration: 10 mg/mL
Prescribed weekly dose: 3.5 mg
Injection frequency: daily (every 1 day)
Per-injection dose = 3.5 ÷ 7 = 0.5 mg
Draw = 0.5 ÷ 10 = 0.05 mL — 5 units on a U-100 insulin syringe
Common women's Testosterone (TRT) microdose reference
| Weekly dose | Vial (10 mg/mL) | Vial (20 mg/mL) | Vial (50 mg/mL) |
|---|
| 2 mg/wk (2×/wk) | 0.10 mL / inj | 0.05 mL / inj | 0.02 mL / inj |
| 5 mg/wk (2×/wk) | 0.25 mL / inj | 0.125 mL / inj | 0.05 mL / inj |
| 5 mg/wk (daily) | 0.07 mL / inj | 0.036 mL / inj | 0.014 mL / inj |
| 10 mg/wk (2×/wk) | 0.50 mL / inj | 0.25 mL / inj | 0.10 mL / inj |
A 10 mg/mL vial gives the largest draw volumes, making small doses easiest to measure accurately. Ask your compounding pharmacy what concentrations they prepare.
Frequently asked questions
What is testosterone microdosing?
Testosterone microdosing means injecting very small amounts of testosterone — typically 0.5–10 mg per week — to raise serum levels into the low-normal physiological range without reaching the doses used in standard men's Testosterone (TRT) (100–250 mg/week). The aim is hormonal balance and symptom relief, not supraphysiological levels. Women naturally produce testosterone from the ovaries and adrenal glands, and output declines significantly during perimenopause and after oophorectomy. Microdosing replaces what's lost rather than adding to it.
Why are women using testosterone therapy?
Women use low-dose testosterone for several evidence-supported reasons: low libido (hypoactive sexual desire disorder), persistent fatigue, cognitive clarity, mood stability, muscle retention, and bone density support. Testosterone is the most abundant biologically active sex hormone in women before menopause — it is not a male-only hormone. Symptoms of low testosterone in women include reduced sexual desire, fatigue not explained by other causes, difficulty maintaining muscle, low motivation, and brain fog. Increasingly, low-dose testosterone is used by women in perimenopause and postmenopause as part of hormone optimization protocols, sometimes alongside estrogen and progesterone.
Is testosterone therapy safe for women?
At physiological replacement doses, the evidence supports a favourable safety profile. The 2019 Global Consensus Position Statement concluded that testosterone therapy is safe for women when doses are titrated to maintain levels within the normal premenopausal physiological range, and that short-term virilising effects — such as acne or increased body hair — are rare and reversible on dose reduction or cessation. The key is keeping serum total testosterone within the female reference range (~0.5–2.0 nmol/L, assay-dependent) and monitoring via regular blood tests. This calculator is a maths tool only — it does not choose your dose. Always confirm your protocol and target range with your prescribing clinician before injecting.
Davis SR, et al. “Global Consensus Position Statement on the Use of Testosterone Therapy for Women.” Lancet Diabetes Endocrinol. 2019;7(10):777–783. Endorsed by the International Menopause Society, Endocrine Society, and 9 other major medical organisations.
Can testosterone help with menopause symptoms?
Testosterone declines significantly during perimenopause and drops sharply after bilateral oophorectomy (surgical menopause). The strongest evidence base is for hypoactive sexual desire disorder (HSDD) in postmenopausal women, where multiple randomised controlled trials have shown benefit. Low-dose testosterone is also used off-label for fatigue, mood, cognitive symptoms, and muscle and bone maintenance in menopausal women, particularly those who do not respond adequately to estrogen therapy alone or who cannot use estrogen. Prescribing patterns vary by country and speciality — a menopause specialist, gynaecologist, or hormone-focused GP can evaluate whether testosterone therapy is appropriate for your specific situation.
What about women who compete in sport — is low-dose Testosterone (TRT) permitted?
This depends on the sport, governing body, and the individual's natural testosterone baseline. WADA (World Anti-Doping Agency) does not ban testosterone at physiological female levels — the prohibited threshold for female athletes is serum testosterone above 10 nmol/L (or in some sports, 5 nmol/L) sustained for 12 months. Women using low-dose Testosterone (TRT) to maintain levels within the normal female range (<2 nmol/L) are typically well below any doping threshold. However, athletes competing under anti-doping rules should obtain a Therapeutic Use Exemption (TUE) from their national anti-doping organisation before beginning testosterone therapy. Non-competitive fitness and bodybuilding contexts have no such restrictions. Always consult your sport's governing body and an anti-doping advisor if you compete.
What testosterone dose do women typically use?
Most women start at 2–5 mg per week and titrate upward based on blood tests and symptom response. Some protocols use daily subcutaneous injections of 0.5–1 mg for the most stable blood levels; others prefer twice-weekly injections of 1–3 mg per injection. Total weekly doses above 10 mg risk pushing serum levels above the female physiological range and causing virilising effects. Common starting doses by ester: Testosterone propionate 2–5 mg/week (short half-life, flexible titration, 2–3×/week injection), testosterone enanthate or cypionate 5–10 mg/week (longer half-life, once or twice-weekly injection). Your prescriber will choose the ester, concentration, and frequency based on your blood results and logistics.
What vial concentration is best for microdosing?
Lower concentrations (5–20 mg/mL) produce larger, easier-to-measure draw volumes for small doses. A 5 mg dose from a 10 mg/mL vial equals 0.5 mL — clearly visible on a 0.3 mL insulin syringe at the 50-unit mark. The same dose from a 200 mg/mL vial (standard men's TRT) would be 0.025 mL — barely 2–3 units on an insulin syringe, prone to measurement error. Most compounding pharmacies will prepare women's testosterone at 10–50 mg/mL specifically to improve dose precision. If you are consistently drawing under 0.05 mL, ask your pharmacy whether a lower-concentration preparation is available. This calculator caps vial strength at 100 mg/mL — standard men's Testosterone (TRT) concentrations are outside the intended dose range of this tool.
What syringe is best for testosterone microdosing?
A 0.3 mL (30-unit) U-100 insulin syringe with a 28–31 gauge needle is the standard choice for subcutaneous microdose testosterone injections. The 0.3 mL barrel has 1-unit graduations, so volumes as small as 0.01 mL (1 unit) can be measured with precision — essential when doses are in the 0.05–0.25 mL range. The short, fine needle (typically 8 mm) allows comfortable subcutaneous injection into the abdomen, thigh, or deltoid fat. For volumes over 0.3 mL, a 0.5 mL or 1 mL insulin syringe works the same way. Avoid standard 3 mL syringes for microdosing — the graduation marks are too coarse to measure sub-0.3 mL volumes accurately.
Related calculators
Related guides
How this is calculated
This calculator divides your prescribed dose by the vial concentration to find the injection volume, then converts that volume to insulin-syringe units (volume in mL × 100 for a U-100 syringe). It is arithmetic only — nothing you enter is stored or sent anywhere, and the result is not medical advice. Always confirm your dose with your prescriber.