TRT Dose Calculator
This TRT dose calculator converts your weekly testosterone prescription into per-injection volume, so you know exactly how much to draw. Works for cypionate, enanthate, propionate, and sustanon at any concentration (100, 150, 200, or 250 mg/mL).
Pick your weekly dose, choose your injection frequency (once a week, twice a week, every 3.5 days, or daily microdosing), and the calculator returns the per-shot mL volume plus the insulin syringe unit equivalent. Updated May 2026 with the new Regimen 2.0 protocol library.
TRT Dosage Calculator
Calculate your injection volume
Enter your weekly dose to calculate how much to draw per injection.
Common: Test Cyp/E (200mg/mL), Test Prop (100mg/mL)
Typical TRT range: 100-200mg per week
Per injection, draw
0.5 mL
= 50 units on a U-100 insulin syringe
(100mg per injection, 2x per week)
Now that you know your dose, never miss an injection.
Regimen tracks your testosterone cypionate protocol — 100mg twice a week. It reminds you when to inject, logs every dose, and shows your estimated blood levels between injections.
- Injection reminders on your schedule
- See testosterone level curves between doses
- Log injection sites to track rotation
Free for one compound. No trial, no paywall.
For educational and research purposes only. This calculator provides estimates based on standard formulas.
Always verify calculations with your healthcare provider before use. We assume no liability for dosing errors, adverse events, or outcomes resulting from use of this tool.
TRT Calculator: mg/mL Conversion Quick Reference
Testosterone esters come in different concentrations. Here's how the math works at each concentration for the most common weekly TRT doses:
| Weekly dose | 100 mg/mL | 150 mg/mL | 200 mg/mL | 250 mg/mL |
|---|---|---|---|---|
| 100 mg/week | 1.0 mL | 0.67 mL | 0.5 mL | 0.4 mL |
| 140 mg/week | 1.4 mL | 0.93 mL | 0.7 mL | 0.56 mL |
| 160 mg/week | 1.6 mL | 1.07 mL | 0.8 mL | 0.64 mL |
| 200 mg/week | 2.0 mL | 1.33 mL | 1.0 mL | 0.8 mL |
To convert mL to insulin syringe units: multiply by 100. So 0.5 mL = 50 units on a U-100 insulin syringe. The calculator above does this automatically for any dose and concentration.
How to Use a TRT Calculator for Weekly Dosing
A TRT dosage calculator works the same way whether you inject once a week, twice a week, every 3.5 days, or daily:
- Enter your total weekly dose in mg. Most TRT protocols sit between 100–200 mg/week.
- Enter your testosterone concentration (mg/mL). Check the vial label.
- Pick your injection frequency. More frequent injections mean smaller, more stable shots.
- Read the per-injection volume. This is what you draw into the syringe each time.
Daily microdosing splits the weekly dose across 7 days, which keeps blood levels flatter and tends to reduce side effects from peak/trough swings. The calculator handles this automatically — just select daily injection frequency.
Test E Calculator: Testosterone Enanthate-Specific Dosing
Testosterone enanthate (test E) has a half-life of around 4.5 days, which means a once-weekly injection produces noticeable peak/trough swings for some users. Many TRT patients on enanthate split into two weekly doses (every 3.5 days) for steadier blood levels.
Enanthate is most commonly compounded at 200 mg/mL or 250 mg/mL. For a typical 140 mg/week TRT dose at 200 mg/mL, that's 0.7 mL once-weekly or 0.35 mL every 3.5 days. The calculator above runs these numbers for any enanthate concentration and frequency you enter.
Cypionate dosing follows similar logic with a slightly longer half-life (~8 days). Propionate is shorter (~2 days) and typically requires injection every other day.
TRT Calculator FAQ
What is a TRT dose calculator?
A TRT dose calculator converts your weekly testosterone prescription (in mg) into the exact per-injection volume (in mL) based on the concentration of your testosterone preparation. It handles cypionate, enanthate, propionate, sustanon, and other esters at any concentration.
How do I calculate TRT dose in mg/mL?
Divide your per-injection dose by the concentration. Example: 70 mg at 200 mg/mL = 70 ÷ 200 = 0.35 mL per injection. The calculator above does this automatically.
What's the average TRT dosage per week?
Most TRT protocols sit between 100–200 mg/week of testosterone cypionate or enanthate. Starting doses are typically 100–140 mg/week, with adjustments based on follow-up labs (total testosterone, free testosterone, estradiol, hematocrit).
How does a TRT calculator handle microdosing?
Daily microdosing splits the total weekly dose across seven injections. The calculator divides your weekly mg by 7, then converts that daily mg into mL based on your concentration. Smaller daily volumes typically use a U-100 insulin syringe.
Is this calculator accurate for testosterone enanthate?
Yes. The math is identical for any testosterone ester — cypionate, enanthate, propionate, or sustanon. The only variable that changes is the half-life, which affects injection frequency choice, not the per-injection volume calculation.
TRT Dose Cheat Sheet: Weekly to Daily Conversions
Quick reference for converting your weekly testosterone cypionate dose (200 mg/mL) to daily microdoses in mL and insulin syringe units.
| Weekly Dose | Daily Dose | mL per Day (200 mg/mL) | Insulin Syringe Units |
|---|---|---|---|
| 70 mg | 10 mg | 0.05 mL | 5 units |
| 100 mg | 14 mg | 0.07 mL | 7 units |
| 120 mg | 17 mg | 0.085 mL | 8.5 units |
| 140 mg | 20 mg | 0.10 mL | 10 units |
| 160 mg | 23 mg | 0.115 mL | 11.5 units |
| 180 mg | 26 mg | 0.13 mL | 13 units |
| 200 mg | 29 mg | 0.145 mL | 14.5 units |
| 250 mg | 36 mg | 0.18 mL | 18 units |
Based on testosterone cypionate at 200 mg/mL concentration. Daily doses are weekly ÷ 7, rounded. Always confirm with your prescriber. See the insulin syringe reading guide if you're new to measuring units.
How to Use This TRT Calculator
Enter your vial concentration
Usually 200mg/mL for testosterone cypionate or enanthate
Enter your prescribed dose
Your total weekly testosterone dose in mg
Select injection frequency
How many times per week you inject (1x, 2x, 3x, etc.)
Get your injection volume
See exactly how many mL to draw per injection
How to Calculate Your TRT Injection Dose
Calculating your testosterone injection dose comes down to three numbers: your prescribed dose in milligrams, your vial concentration in mg/mL, and your syringe type.
The formula:
Dose (mL) = Prescribed dose (mg) ÷ Vial concentration (mg/mL)
Example: Your doctor prescribes 140mg of testosterone cypionate per week. Your vial is 200mg/mL.
140 ÷ 200 = 0.7 mL per week
If you inject twice weekly, that's 0.35 mL per injection. If you use a 1mL insulin syringe (100 units), 0.35 mL = 35 units.
Common Testosterone Concentrations
Most testosterone vials come in one of these concentrations:
| Concentration | Common For | Notes |
|---|---|---|
| 200 mg/mL | Testosterone Cypionate (US) | Most common US prescription concentration |
| 250 mg/mL | Testosterone Enanthate (International) | Standard outside the US |
| 100 mg/mL | Testosterone Cypionate | Some US pharmacies, lower concentration |
| 300 mg/mL | Compounded Testosterone | Higher concentration for smaller injection volumes |
Always check your vial label for the exact concentration before calculating your dose. See our testosterone cypionate dosage guide for detailed dosing recommendations by goal and frequency.
Injection Frequency and How It Affects Your Dose
Your total weekly dose stays the same regardless of frequency — you're just splitting it into smaller, more frequent injections. Here's how a 140mg/week prescription breaks down:
| Frequency | Dose Per Injection | Why People Choose This |
|---|---|---|
| Once weekly | 140mg (0.7 mL at 200mg/mL) | Simplest schedule, fewest injections |
| Twice weekly (every 3.5 days) | 70mg (0.35 mL) | More stable levels, less peak-to-trough variation |
| Every other day | 40mg (0.2 mL) | Even more stable, popular with SubQ injections |
| Daily microdosing | 20mg (0.1 mL / 10 units) | Most stable levels, uses insulin syringes |
More frequent injections generally mean more stable testosterone levels. Regimen's half-life visualizer shows you exactly how your injection frequency affects your estimated blood levels between doses. Learn more about TRT injection schedules and microdosing protocols.
How to Read an Insulin Syringe for TRT
Many TRT patients use insulin syringes (especially for daily microdosing or SubQ injections). Here's how to convert:
- 1 mL insulin syringe = 100 units
- So 0.1 mL = 10 units, 0.2 mL = 20 units, etc.
- At 200mg/mL: 10 units = 20mg of testosterone
For a detailed visual guide with syringe diagrams, see our complete insulin syringe reading guide. For a complete reference table, see: Units vs mL vs mg syringe conversion guide.
Testosterone Cypionate vs Enanthate Dosing
Both esters deliver testosterone, but they have slightly different half-lives that affect how your levels behave between injections:
- Testosterone Cypionate: ~8 day half-life. Most prescribed TRT ester in the US. Available at 100mg/mL and 200mg/mL.
- Testosterone Enanthate: ~4.5-7 day half-life. Most prescribed internationally. Commonly 250mg/mL.
The shorter half-life of enanthate means slightly faster peaks and deeper troughs at the same injection frequency. Some enanthate users prefer more frequent injections to compensate. Use Regimen's half-life visualizer to compare the PK curves for each ester at your injection frequency.
For a complete guide to injection scheduling, see our TRT injection schedule guide.
What to Do After Calculating Your Dose
Log it in Regimen.
Track every injection — dose, volume, injection site, and time. Regimen is free for one compound with every feature included.
Visualize your levels.
Regimen's half-life visualizer shows your estimated testosterone levels between injections based on your ester's half-life.
Track your health metrics.
Connect Apple Health or Google Health Connect to see how your TRT protocol affects your blood pressure, weight, energy, and sleep over time.
Share with your provider.
Export your dose history and health data to bring to your next clinic visit.
TRT Questions & Answers
TRT Dosing in the UK
The UK standard for TRT differs from the US. Sustanon 250 (a blend of four testosterone esters at 250mg/mL) is the NHS default. Nebido (testosterone undecanoate, 1000mg every 10-14 weeks) is common for men preferring less frequent injections. This calculator works for all testosterone esters and concentrations — enter your vial concentration and desired dose to get your exact injection volume.
UK readers: for testosterone ester concentration tables, NHS vs private dosing patterns, and insulin syringe unit conversions specific to UK pharmacy practice, see our TRT dose conversion guide for UK patients.
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Data Sources
This tool uses dosing information from official prescribing information:
- •Standard TRT Protocols — Testosterone cypionate and enanthate dosing guidelines for hormone replacement therapy
- •Oil-Based Injection Standards — Volume calculations for intramuscular and subcutaneous testosterone injections
Track your TRT protocol, not just the math
Regimen is a free tracker app for people on testosterone replacement therapy.
- Built-in dose calculators
- Smart injection reminders
- Log levels, symptoms, and progress
- Private, secure health data
