TRT Calculators
Last updated: June 2026
200mg/ml vs 250mg/ml Testosterone: Draw-Up Volume Chart
Testosterone cypionate and enanthate are most often dispensed at either 200mg/ml or 250mg/ml. The same weekly milligram dose needs a different draw-up volume at each concentration, and this page is the reference chart showing both side by side.
The 200mg/ml vs 250mg/ml testosterone draw chart
The numbers below come from one formula: volume (mL) = dose (mg) ÷ concentration (mg/mL). To convert that volume into the marks on a U-100 insulin syringe, multiply by 100, because a U-100 syringe is graduated so that 1.00 mL equals 100 units. The chart covers the weekly doses you are most likely to see prescribed, from 80 mg up to 250 mg.
| Weekly dose | 200mg/ml volume | 200mg/ml units (U-100) | 250mg/ml volume | 250mg/ml units (U-100) |
|---|---|---|---|---|
| 80 mg | 0.40 mL | 40 units | 0.32 mL | 32 units |
| 100 mg | 0.50 mL | 50 units | 0.40 mL | 40 units |
| 120 mg | 0.60 mL | 60 units | 0.48 mL | 48 units |
| 140 mg | 0.70 mL | 70 units | 0.56 mL | 56 units |
| 160 mg | 0.80 mL | 80 units | 0.64 mL | 64 units |
| 180 mg | 0.90 mL | 90 units | 0.72 mL | 72 units |
| 200 mg | 1.00 mL | 100 units | 0.80 mL | 80 units |
| 250 mg | 1.25 mL | 125 units | 1.00 mL | 100 units |
Read across a single row to compare the two concentrations. At 250mg/ml every dose occupies less liquid, because each millilitre carries more testosterone. This is purely a measurement relationship; it does not change how much hormone enters your body, only the volume you draw to deliver it. For a single dose entered with your own numbers, use the TRT dose calculator.
How the volume math works
Concentration tells you how many milligrams sit in each millilitre of oil. Dividing your target dose by that concentration returns the volume that contains exactly that dose. The relationship is covered in more depth in how mg/ml works and concentration explained simply.
Example
You are prescribed 140 mg weekly. With a 200mg/ml vial: 140 ÷ 200 = 0.70 mL, which is 70 units on a U-100 syringe. With a 250mg/ml vial: 140 ÷ 250 = 0.56 mL, which is 56 units. Same 140 mg of testosterone either way; the higher-strength vial just needs 0.14 mL less liquid.
The mass of testosterone you inject is identical across both columns. Only the volume differs. This is the distinction explained in dose vs volume explained, and it is why vial strength changes the dose if you forget to recalculate after switching vials.
Split-dose draw chart (twice weekly)
Many protocols split the weekly amount into two injections to keep blood levels steadier; the rationale is covered in daily vs twice weekly vs every 3.5 days. To find a per-injection volume, halve the weekly dose first, then divide by concentration. The chart below shows each half-dose at both strengths.
| Weekly dose | Per injection (2x/wk) | 200mg/ml volume | 250mg/ml volume |
|---|---|---|---|
| 100 mg | 50 mg | 0.25 mL (25 u) | 0.20 mL (20 u) |
| 120 mg | 60 mg | 0.30 mL (30 u) | 0.24 mL (24 u) |
| 140 mg | 70 mg | 0.35 mL (35 u) | 0.28 mL (28 u) |
| 160 mg | 80 mg | 0.40 mL (40 u) | 0.32 mL (32 u) |
| 200 mg | 100 mg | 0.50 mL (50 u) | 0.40 mL (40 u) |
Example
160 mg per week, split into two doses, equals 80 mg per injection. At 200mg/ml: 80 ÷ 200 = 0.40 mL (40 units). At 250mg/ml: 80 ÷ 250 = 0.32 mL (32 units). Over a full week both add up to the same 160 mg.
Which syringe size fits each volume
The volumes in these charts fit different syringes. A 0.5 mL (50-unit) insulin syringe handles any single draw up to 50 units, which covers most split doses at both concentrations. A 1 mL (100-unit) syringe is needed once a single draw exceeds 0.5 mL, such as 200 mg in one shot at 200mg/ml (1.00 mL) or 250 mg at 250mg/ml (1.00 mL). Choosing between barrel sizes is covered in 0.3mL vs 0.5mL vs 1mL syringes.
- Up to 0.5 mL (50 units): a 0.5 mL insulin syringe gives the finest, easiest-to-read graduations.
- Above 0.5 mL: step up to a 1 mL syringe; a 0.5 mL barrel cannot hold the full draw.
- Reading the marks: on a U-100 syringe, each small line is 1 unit (0.01 mL), so 0.56 mL is 56 units.
A larger needle or barrel does not change the dose; it only changes what you can physically measure. See how to calculate injection volume for the full walkthrough.
Why the concentration is printed on the vial
Testosterone cypionate and enanthate are oil-based esters; the concentration on the label is the manufacturer's stated milligrams of testosterone ester per millilitre of oil. United States cypionate products such as Depo-Testosterone are commonly labelled 200 mg/mL, while 250 mg/ml ampoules of enanthate (and blended-ester products such as Sustanon, labelled 250 mg/ml) are widely dispensed elsewhere. The ester attached to the molecule mainly affects how slowly it releases, not the draw-up math; that distinction is covered in testosterone esters explained.
Always read the concentration off your own vial before drawing. If a pharmacy switches you from a 200mg/ml to a 250mg/ml product, the milligram dose your prescriber set has not changed, but the volume on the syringe must be recalculated, as set out in what does mg per week mean.
A note on safety and accuracy
This page is a measurement reference, not a dosing recommendation. The correct dose, concentration, ester, and injection frequency are decisions for your prescribing clinician based on bloodwork and symptoms. Testosterone is a controlled prescription medicine in most countries, and clinical guidelines set out how it should be initiated and monitored.
Use the chart to translate a dose your clinician has already set into a syringe volume, and double-check it against the printed concentration on your vial. If a number does not match what you expect, recalculate with the TRT dose calculator rather than guessing.
FAQs
Why does 250mg/ml need less volume than 200mg/ml for the same dose?
Because each millilitre of the 250mg/ml oil carries more testosterone. Dividing the same dose by a larger concentration gives a smaller volume. For 100 mg: 100 ÷ 200 = 0.50 mL, but 100 ÷ 250 = 0.40 mL. The amount of testosterone delivered is identical; only the liquid volume differs.
How do I convert mL to insulin-syringe units?
On a U-100 insulin syringe, 1.00 mL equals 100 units, so multiply your volume in mL by 100. For example, 0.56 mL is 56 units and 0.80 mL is 80 units. This conversion is fixed for any U-100 syringe regardless of medication or concentration.
Is 200 mg per week the same as 200mg/ml?
No. 200 mg per week is a dose (an amount of testosterone over time). 200mg/ml is a concentration (how much testosterone is in each millilitre of the vial). They use the same number here by coincidence; at 200mg/ml a 200 mg dose happens to be exactly 1.00 mL.
My pharmacy switched my vial from 200 to 250mg/ml. Did my dose change?
Your prescribed milligram dose has not changed, but the volume you draw must be recalculated. A dose that was 1.00 mL at 200mg/ml becomes 0.80 mL at 250mg/ml. Always read the concentration on the new vial and confirm the new volume before injecting.
Read next
Why Vial Strength Changes The DoseSources
- DEPO-TESTOSTERONE (testosterone cypionate injection, solution) prescribing information. DailyMed, U.S. National Library of Medicine / FDA. dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=cfbb53d4-b868-4a28-8436-f9112eb01c39.
- Bhasin S, Brito JP, Cunningham GR, et al. Testosterone Therapy in Men With Hypogonadism: An Endocrine Society Clinical Practice Guideline. J Clin Endocrinol Metab. 2018;103(5):1715-1744. PMID 29562364. pubmed.ncbi.nlm.nih.gov/29562364.
- Sustanon 250, 250mg/ml solution for injection: Summary of Product Characteristics (SmPC). Electronic Medicines Compendium (emc), Datapharm. www.medicines.org.uk/emc/product/5373/smpc.
- Eby EL, Curtis BH, Gelwicks SC, et al. Clinical Challenges With Concentrated Insulins: Setting the Record Straight. Diabetes Spectr. 2017;30(4):229-232 (American Diabetes Association). PMCID PMC5687105. pmc.ncbi.nlm.nih.gov/articles/PMC5687105.
This guide is for general educational purposes only and does not constitute medical advice. Always follow your prescriber's specific instructions.