Testosterone Dosage Chart 2026: mg, mL & Units Guide

If your provider prescribed “100mg of testosterone cypionate” and you’re staring at a syringe trying to figure out where to draw to, you’re not alone, this is one of the most common points of confusion in TRT. The dose on your prescription (mg), the liquid you draw (mL), and the markings on your syringe (units) are three different measurements, and mixing them up is how people under- or over-dose by accident.

This guide breaks down exactly how mg, mL, and units relate to each other, with a free calculator and a full conversion chart for commonly used testosterone concentrations, so you can confirm your draw matches what your provider actually prescribed.

TRT Dosage Calculator: Convert mg to mL and Syringe Units Instantly

Instead of doing the math by hand every refill, enter your prescribed dose and vial concentration below.

The formulas behind this calculator:

• Volume (mL) = Prescribed dose (mg) ÷ Concentration (mg/mL)
• Syringe units = Volume (mL) × 100 (U-100 syringes only see warning below)

Important disclaimer: This calculator converts a dose your provider has already prescribed into mL and syringe units. It does not recommend, calculate, or validate what your TRT dose should be. If you haven’t been prescribed a specific dose yet, this tool isn’t the place to find one, that decision belongs to your provider.

Understanding mg, mL, and Units What Do They Actually Mean?

• mg (milligrams): The actual amount of testosterone in your prescribed dose. This is what your provider writes on your prescription.
• mL (milliliters): The volume of liquid you need to draw into the syringe to deliver that mg amount. This depends entirely on the concentration of your vial.
• Units: The markings printed on a standard insulin-style syringe.

Testosterone is commonly formulated at 100 mg/mL or 200 mg/mL, per the FDA-approved prescribing information for testosterone cypionate injection but concentrations can vary, especially with compounded prescriptions. Always confirm the concentration printed on your specific vial label before calculating anything; never assume it matches a previous refill or a general chart.

Common Mistakes When Converting TRT Doses

• Assuming mL tells you the dose without knowing concentration: A 1 mL draw means nothing on its own, it’s 100mg at 100mg/mL, but 200mg at 200mg/mL.
• Assuming your vial matches a previous one: Always check the label directly, concentrations can differ between pharmacies or formulations.
• Rounding too aggressively, or “filling a little extra: Some guides suggest drawing slightly past the line to account for wasted liquid in the needle, but any deviation from your prescribed amount should be confirmed with your provider, not treated as a rounding habit.
• Assuming the units-to-mL conversion applies to every syringe: It only applies to U-100 syringes see the next section before relying on a units reading.

A Quick Warning Before You Read Units Off a Syringe

The ×100 conversion (units = mL × 100) only applies to U-100 syringes, the standard most pharmacies dispense for insulin and testosterone injections. “U-100” refers to a fixed scale where 100 units always equals 1 mL,  this ratio doesn’t change whether you’re holding a 0.3 mL, 0.5 mL, or 1 mL syringe. What changes between syringe sizes is simply how much volume the barrel can physically hold, a 0.3 mL syringe can measure up to 30 units, a 0.5 mL syringe up to 50 units, and a 1 mL syringe up to 100 units. The scale itself is identical across all of them: 1 unit always equals 0.01 mL, regardless of syringe size. The practical takeaway is to pick a syringe sized to actually hold your volume, not to worry about the scale itself changing. If your syringe isn’t labeled U-100, don’t apply this conversion, confirm with your pharmacist instead.

The Full mg-to-mL-to-Units Chart

At 200 mg/mL Concentration

At 100 mg/mL Concentration

At half the concentration, you need double the volume for the same mg dose:

Important: if your prescribed mg dose at 100 mg/mL concentration comes out to more than 1 mL, a standard 1mL syringe physically can’t hold it. If your calculated volume exceeds your syringe’s capacity, contact your provider or pharmacist rather than adjusting it yourself, they can specify the correct syringe size for your prescription. If you’re unsure which syringe size you’ve been given, this guide to needle and syringe sizing for testosterone injections explains how to check.

How Injection Frequency Changes Your Per-Dose Amount

The chart above shows a single dose, but your per-injection amount depends on how often you inject. The same weekly total looks different depending on your schedule:

• 160 mg once weekly = 0.8 mL (80 units) in a single injection
• 160 mg split twice weekly = 80 mg per injection = 0.4 mL (40 units) each time

Always calculate your per-injection mg amount first, based on your actual prescribed schedule, before converting to mL and units, the weekly total and the per-injection amount are not the same number. This breakdown of how often to inject testosterone covers how schedules are typically structured.

Intramuscular vs. Subcutaneous: Does the Chart Change?

The FDA label for testosterone cypionate specifies deep intramuscular (gluteal) injection as the approved route. Many clinics now also prescribe subcutaneous injection as an evidence-supported alternative, particularly for smaller, more frequent doses, but this is an off-label practice pattern, not an FDA-approved labeling change. The mg-to-mL-to-units math stays identical regardless of injection method, what changes is needle length and injection depth, not the dose conversion itself. This comparison of subcutaneous versus intramuscular testosterone injections breaks down which method your provider might choose and why.

What Determines Your TRT Dose and How It Is Monitored

Your provider’s prescribed mg amount isn’t arbitrary, and it isn’t necessarily permanent. Initial dosing typically factors in:

• Baseline testosterone and SHBG levels: since higher SHBG binds more testosterone, often requiring dose adjustment
• Body composition: with higher body fat affecting how testosterone is metabolized
• Symptom severity: at the time of diagnosis

But dosing is also an ongoing process, adjusted based on:

• Follow-up testosterone labs: obtained at the interval recommended by your healthcare provider
• Hematocrit levels: to catch elevated red blood cell counts (polycythemia) before they become a problem
• Symptom response: since the goal is relief of symptoms, not just hitting a specific lab number
• Side effects: such as acne, mood changes, or other treatment-related concerns, which may prompt a dose or frequency change

This is why two men on the same weekly mg total can end up on very different protocols after a few months.

Getting Your Dose Confirmed Properly

A dosage chart is a reference tool, not a substitute for a provider actually confirming your starting dose and adjusting it based on your labs. Per guidance from the American Urological Association’s Testosterone Deficiency Guideline, follow-up testing should occur at appropriate intervals to confirm target levels are reached, with ongoing monitoring every 6-12 months. If you haven’t had your dose formally reviewed recently, this walkthrough of what happens at a TRT consultation explains what that evaluation process actually looks like.

Conclusion

The confusion between mg, mL, and units isn’t a sign you’re doing something wrong, it’s a genuinely common gap in how prescriptions get communicated. Once you confirm your vial’s actual concentration, the math is fixed and repeatable: mg divided by concentration gives you mL, and mL multiplied by 100 gives you units on a U-100 syringe. Keep that formula, verify your concentration every refill, and confirm anything unclear with your provider rather than guessing.

Frequently Asked Questions

How many units is 100mg of testosterone?

At 200 mg/mL concentration, 100mg equals 0.5 mL, which reads as 50 units on a U-100 syringe. At 100 mg/mL concentration, 100mg equals a full 1.0 mL, or 100 units. Always confirm your vial’s actual concentration before relying on either figure.

How many mL is 200mg of testosterone cypionate?

At 200 mg/mL concentration, 200mg equals exactly 1.0 mL. At 100 mg/mL, 200 mg would require 2.0 mL, which exceeds the capacity of a standard 1 mL syringe. Contact your provider or pharmacist to confirm the appropriate syringe and administration instructions.

Is 1 mL of testosterone enough for a week?

It depends entirely on concentration and prescribed dose. At 200 mg/mL, 1 mL delivers 200mg. At 100 mg/mL, the same 1 mL delivers only 100mg. The volume alone doesn’t tell you the dose without knowing the concentration, check your vial label.

What’s the difference between testosterone cypionate and enanthate dosing?

Both esters have similar release profiles and are generally considered comparable in clinical use, but they are not automatically interchangeable at a patient level. Dosing and scheduling should always follow your specific provider’s protocol rather than an assumption that the two esters convert on a 1:1 basis in every case.

What happens if I draw the wrong number of units?

Drawing a different amount than prescribed changes your actual hormone exposure compared to what your labs and treatment plan are based on. If you’re ever unsure of your concentration, syringe type, or the correct draw, contact your provider or pharmacist before injecting rather than estimating.

How often should I inject testosterone for TRT?

This varies by provider and individual response, weekly and twice-weekly schedules are both common, with the per-injection amount adjusted accordingly using the conversion math above.

Written by: Tejanshu Jaluthria, Health Content Writer | Last updated: October 7th, 2026

Resources & References

• FDA Prescribing Information: Testosterone Cypionate Injection, USP
• American Urological Association: Testosterone Deficiency Guideline

Medical Disclaimer

This article is for informational and educational purposes only and does not constitute medical advice. It is intended to help you understand standard dose conversion math, not to recommend any specific dose. Testosterone dosing should only be determined, adjusted, or confirmed by a licensed healthcare provider based on your individual lab results and medical history.