Testosterone (TRT) Dosage Calculator
Your prescription says milligrams; your syringe says mL or units. Enter your vial's concentration and your dose per injection to see exactly how much to draw. Set how many injections you take a week to see how long a vial will last.
Used only to count doses per vial.
= 0.5 mL of a 200 mg/mL solution, delivering 100 mg.
Testosterone mg-to-mL chart
Volume per injection at the three concentrations you're most likely to see on a US label. Cypionate is usually 200 mg/mL (sometimes 100 mg/mL); enanthate is usually 200 or 250 mg/mL.
| Dose per injection | 100 mg/mL | 200 mg/mL | 250 mg/mL |
|---|---|---|---|
| 50 mg | 0.5 mL | 0.25 mL (25 units) | 0.2 mL (20 units) |
| 70 mg | 0.7 mL | 0.35 mL (35 units) | 0.28 mL (28 units) |
| 80 mg | 0.8 mL | 0.4 mL (40 units) | 0.32 mL (32 units) |
| 100 mg | 1 mL | 0.5 mL (50 units) | 0.4 mL (40 units) |
| 120 mg | 1.2 mL | 0.6 mL (60 units) | 0.48 mL (48 units) |
| 150 mg | 1.5 mL | 0.75 mL (75 units) | 0.6 mL (60 units) |
| 200 mg | 2 mL | 1 mL (100 units) | 0.8 mL (80 units) |
Weekly dose vs. dose per injection
TRT prescriptions are often written as a weekly total, such as 140 mg per week, but some prescribers split that into two or more smaller injections to keep blood levels steadier between shots. The calculator works per injection, so divide the weekly total by your number of injections first:
| Weekly dose | 1 injection | 2 injections | 3 injections |
|---|---|---|---|
| 100 mg / week | 100 mg = 0.5 mL | 50 mg = 0.25 mL | 33.3 mg = 0.167 mL |
| 140 mg / week | 140 mg = 0.7 mL | 70 mg = 0.35 mL | 46.7 mg = 0.233 mL |
| 160 mg / week | 160 mg = 0.8 mL | 80 mg = 0.4 mL | 53.3 mg = 0.267 mL |
| 200 mg / week | 200 mg = 1 mL | 100 mg = 0.5 mL | 66.7 mg = 0.333 mL |
Volumes shown at 200 mg/mL.
Cypionate vs. enanthate
Both are long-acting testosterone esters dosed the same way by milligram. Cypionate is the most common in the US and is typically suspended in cottonseed oil; enanthate is usually in sesame oil, which matters for anyone with a sensitivity to one of them. The calculation is identical: mL = mg ÷ mg/mL. The difference that changes your draw is the concentration, so check the label whenever you switch products or pharmacies.
Frequently Asked Questions
How many mL is 100 mg of testosterone cypionate?
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At the most common strength, 200 mg/mL, 100 mg is 0.5 mL (50 units on an insulin syringe). At 100 mg/mL it is 1 mL. Testosterone enanthate at 250 mg/mL would be 0.4 mL.
How many mL is 200 mg of testosterone?
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At 200 mg/mL, 200 mg is exactly 1 mL. At 250 mg/mL it is 0.8 mL, and at 100 mg/mL it is 2 mL, which is more than an insulin syringe holds.
How do I split a weekly testosterone dose into two injections?
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Divide the weekly dose by the number of injections. 140 mg a week split into two injections is 70 mg each; at 200 mg/mL that's 0.35 mL, or 35 units. Enter the per-injection dose and set injections per week to 2 in the calculator. Only change your injection frequency if your prescriber has told you to.
Can I use an insulin syringe for testosterone?
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Many TRT patients inject subcutaneously with insulin syringes, which is why the calculator shows units. Intramuscular injections use a longer needle on a 1–3 mL syringe, so go by the mL figure. Which route and syringe you use is your prescriber's call.
How long will a 10 mL vial of testosterone last?
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A 10 mL vial at 200 mg/mL holds 2,000 mg. At 100 mg a week that's 20 weeks; at 200 mg a week, 10 weeks. Multi-dose vials also have a discard date once opened, which your pharmacy label specifies.
Medical disclaimer: The example dose is there only to show how the calculator works. It is not a dose recommendation. Testosterone dosing is individual and should be set and adjusted by a prescriber based on symptoms and lab results such as total testosterone and hematocrit. Always follow your prescription and pharmacy label. Not medical advice.