DoseRoutine

Testosterone Cypionate Dosage Calculator

Testosterone cypionate comes pre-mixed in oil at a stated concentration (usually 200 mg/mL), so you are not reconstituting — you are converting mg to volume. Enter the vial's total mg and total mL and the calculator handles the rest.

This is a unit converter. It converts an amount you already have into volume and syringe units. It does not tell you what to take, and it is educational only — not medical advice. Confirm every amount with your clinician and your product label.

Common setups

Vial size (mg)

Total compound in the vial.

BAC water added (mL)

Volume of bacteriostatic water you reconstitute with.

Target dose

Per-injection dose you want to draw.

Syringe type

U-100 = 100 units per mL (standard). U-40 = 40 units per mL.

Draw

50.0 units

on a U-100 insulin syringe (0.500 mL)

Concentration

200.00 mg/mL

Per dose

100.00 mg

Doses / vial

~20

Testosterone cypionate concentration reference (mg/mL)

What each vial size becomes at common bacteriostatic water volumes.

Vial	+ 1 mL	+ 2 mL	+ 3 mL	+ 5 mL
200 mg	200.00 mg/mL	100.00 mg/mL	66.67 mg/mL	40.00 mg/mL
400 mg	400.00 mg/mL	200.00 mg/mL	133.33 mg/mL	80.00 mg/mL
2000 mg	2000.00 mg/mL	1000.00 mg/mL	666.67 mg/mL	400.00 mg/mL

Testosterone cypionate dosing at a glance

Phase	Dose	Frequency	Notes
Typical TRT total	100–200 mg	Per week	Split into two injections in most modern protocols.
Twice weekly	50–100 mg	Every 3–4 days	Smoother levels than a single weekly shot.
Daily subcutaneous	~14–28 mg	Daily	Flattest curve; smallest volumes.
Bloodwork	—	At 6–8 weeks	Trough total T, free T, oestradiol, haematocrit.

Reference ranges reported in the literature and in common practice — not a prescription, and not personalised advice.

What trips people up

At the common 200 mg/mL, 100 mg = 0.5 mL = 50 units on a U-100 syringe.
Insulin syringes are marked in units, not mL. 100 units = 1 mL. This is the single most common mix-up.
Cypionate is an oil — subcutaneous injections need a slower push and often a slightly longer needle than water-based peptides.
Haematocrit rises on TRT for many people. It should be checked regularly, not assumed.

How the maths works

Concentration (mg/mL) = vial mg ÷ bacteriostatic water mL.
Volume per dose (mL) = dose mg ÷ concentration.
Syringe units = volume × 100 on a U-100 syringe, or × 40 on a U-40 syringe.
Doses per vial = vial mg ÷ dose mg. Water volume never changes this number.

Testosterone cypionate calculator FAQ

How many units is 100 mg of testosterone cypionate?

At 200 mg/mL it is 0.5 mL = 50 units on a U-100 insulin syringe. At 100 mg/mL the same dose is a full 1 mL = 100 units.

How many units is 200 mg of testosterone?

At 200 mg/mL that is exactly 1 mL, which is 100 units — a full U-100 syringe. Many people split this into two 50-unit injections across the week instead.

Is it better to inject testosterone weekly or twice weekly?

Twice weekly (or more often) produces smaller peaks and troughs, which many clinicians prefer for stability and for reducing oestradiol swings. The total weekly milligrams stay the same.

Can testosterone cypionate be injected subcutaneously?

Yes — subcutaneous injection is now widely used and generally as effective as intramuscular, with smaller needles. It can cause more local irritation with thicker oils.

Testosterone cypionate reference page Check interactions TRT dosage calculator TRT & supplement interactions

Educational tool only — not medical advice. Verify every dose with your prescriber and follow sterile technique. See our medical disclaimer.

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