Compounded GLP-1
Compounded GLP-1 dosage calculator: mg to units
Convert the tirzepatide or semaglutide dose on your prescription into units on a U-100 insulin syringe. Choose the strength on your vial label and your prescribed dose, and see where it lands on the syringe.
Quick answer: on a U-100 insulin syringe, units = dose in mg ÷ strength in mg/mL × 100. For example, 2.5 mg of tirzepatide at 17 mg/mL is 14.7 units.
Your result
14.7 units
0.147 mL. That's 2.5 mg of tirzepatide at 17 mg/mL.
That falls between the 14 and 16 unit marks on this syringe. Ask your pharmacy or care team how to measure it, or use a syringe with finer marks.
This converts the dose on your prescription. It doesn't recommend a dose. Follow your label and your care team's instructions, and contact them before you inject if anything doesn't match.
How the math works
A U-100 insulin syringe holds 100 units in 1 mL. To turn a dose into units, divide the dose in mg by your vial's strength in mg/mL, then multiply by 100. For example, 2.5 mg ÷ 17 mg/mL × 100 = 14.7 units. The charts below show common doses at common strengths. Your own label's strength is the one that counts.
GLP-1 dosage charts: mg to units
Tirzepatide dosage chart: mg to units
| Weekly dose | 8.5 mg/mL | 10 mg/mL | 12.5 mg/mL | 15 mg/mL | 17 mg/mL | 17.65 mg/mL | 18 mg/mL | 20 mg/mL | 25 mg/mL | 30 mg/mL |
|---|---|---|---|---|---|---|---|---|---|---|
| 0.5 mg | 5.9 | 5 | 4 | 3.3 | 2.9 | 2.8 | 2.8 | 2.5 | 2 | 1.7 |
| 2.5 mg | 29.4 | 25 | 20 | 16.7 | 14.7 | 14.2 | 13.9 | 12.5 | 10 | 8.3 |
| 5 mg | 58.8 | 50 | 40 | 33.3 | 29.4 | 28.3 | 27.8 | 25 | 20 | 16.7 |
| 7.5 mg | 88.2 | 75 | 60 | 50 | 44.1 | 42.5 | 41.7 | 37.5 | 30 | 25 |
| 10 mg | 117.62 syringes | 100 | 80 | 66.7 | 58.8 | 56.7 | 55.6 | 50 | 40 | 33.3 |
| 12.5 mg | 147.12 syringes | 1252 syringes | 100 | 83.3 | 73.5 | 70.8 | 69.4 | 62.5 | 50 | 41.7 |
| 15 mg | 176.52 syringes | 1502 syringes | 1202 syringes | 100 | 88.2 | 85 | 83.3 | 75 | 60 | 50 |
Semaglutide dosage chart: mg to units
| Weekly dose | 1 mg/mL | 2.5 mg/mL | 5 mg/mL |
|---|---|---|---|
| 0.125 mg | 12.5 | 5 | 2.5 |
| 0.25 mg | 25 | 10 | 5 |
| 0.5 mg | 50 | 20 | 10 |
| 1 mg | 100 | 40 | 20 |
| 1.7 mg | 1702 syringes | 68 | 34 |
| 2.4 mg | 2403 syringes | 96 | 48 |
Numbers are units on a U-100 syringe, rounded to one decimal place. Over 100 units takes more than one 1 mL syringe. For any other strength, type it into the calculator.
Frequently asked questions
How many units is 2.5 mg of tirzepatide?
It depends on the strength of your vial. On a U-100 insulin syringe, 100 units is 1 mL, so units = dose in mg ÷ strength in mg/mL × 100. At 17 mg/mL, 2.5 mg is about 14.7 units. At 10 mg/mL it's 25 units. Always use the strength printed on your own label.
How many units is 0.25 mg of semaglutide?
At 2.5 mg/mL, 0.25 mg is 10 units. At 1 mg/mL it's 25 units, and at 5 mg/mL it's 5 units. Check the strength on your label before you measure.
How many units is 5 mg of tirzepatide?
At 17 mg/mL, 5 mg is 29.4 units. At 10 mg/mL it's 50 units, and at 20 mg/mL it's 25 units. Use the strength on your own label.
How many units is 7.5 mg of tirzepatide?
At 17 mg/mL, 7.5 mg is 44.1 units. At 10 mg/mL it's 75 units, and at 20 mg/mL it's 37.5 units. Use the strength on your own label.
How many units is 10 mg of tirzepatide?
At 17 mg/mL, 10 mg is 58.8 units. At 10 mg/mL it's 100 units, and at 20 mg/mL it's 50 units. Use the strength on your own label.
How many units is 15 mg of tirzepatide?
At 17 mg/mL, 15 mg is 88.2 units. At 10 mg/mL it's 150 units (2 syringes on a 1 mL syringe), and at 20 mg/mL it's 75 units. Use the strength on your own label.
How many units is 0.5 mg of semaglutide?
At 2.5 mg/mL, 0.5 mg is 20 units. At 1 mg/mL it's 50 units, and at 5 mg/mL it's 10 units. Use the strength on your own label.
How many units is 1 mg of semaglutide?
At 2.5 mg/mL, 1 mg is 40 units. At 1 mg/mL it's 100 units, and at 5 mg/mL it's 20 units. Use the strength on your own label.
How many units is 2.4 mg of semaglutide?
At 2.5 mg/mL, 2.4 mg is 96 units. At 1 mg/mL it's 240 units (3 syringes on a 1 mL syringe), and at 5 mg/mL it's 48 units. Use the strength on your own label.
How do I convert mg to units for a GLP-1 injection?
Divide your dose in mg by your vial's strength in mg/mL, then multiply by 100. That gives units on a U-100 insulin syringe, where 100 units is 1 mL. For example, 7.5 mg of tirzepatide at 17 mg/mL is 7.5 ÷ 17 × 100 = 44.1 units.
How many units are in 1 mL?
A U-100 insulin syringe holds 100 units in 1 mL, so 0.5 mL is 50 units and 0.25 mL is 25 units. Check that your syringe package says U-100.
Why did my units change when my vial changed?
Vials come in different strengths. The same dose in mg takes fewer units from a stronger vial and more units from a weaker one. Your dose in mg only changes if your provider changes it. Use the units for the vial you're using now, and check your label and instructions.
How do I read the strength on my vial label?
Look for the number in mg per mL. If the label lists two numbers, like 17 mg/0.5 mg/mL, the first is the medication and the second is an added ingredient, such as vitamin B12. If it lists a total, like 34 mg/2 mL, divide the mg by the mL to get the strength (here, 17 mg/mL). Some labels give the amount in 0.5 mL instead of 1 mL: 5 mg/0.5 mL is 10 mg/mL, not 5. If you're not sure, ask your pharmacy or care team before you inject.
What strengths does compounded tirzepatide come in?
It varies by pharmacy. The calculator lists 8.5, 10, 12.5, 15, 17, 17.65, 18, 20, 25 and 30 mg/mL, and you can type any other strength from your label.
What if my dose doesn't fit in one syringe?
Use more than one syringe. Fill the first one to its top mark (100 units on a 1 mL syringe) and draw the rest into the second. For example, 150 units is 100 units in the first syringe and 50 in the second. The calculator shows the split for your dose.
Does this calculator tell me what dose to take?
No. It only converts the dose your provider prescribed into units. Your provider decides your dose and any changes to it.
Which syringe should I use?
Use the syringes that come with your medication, and check that the package says U-100. This calculator works only for U-100 insulin syringes. Smaller syringes (0.3 mL or 0.5 mL) have finer marks, which helps with small doses.
Can I keep using a vial after the date on the label?
No. Follow the discard date on your label and the pharmacy's storage instructions. Don't use a vial after that date, even if some medication is left.
Important safety information
GLP-1 medications can cause side effects, most commonly nausea, vomiting, diarrhea and constipation, and carry serious risks. Labeling for FDA-approved semaglutide and tirzepatide products includes a boxed warning about thyroid C-cell tumors. Your provider reviews these risks before prescribing.
Read the FDA's concerns with unapproved GLP-1 drugs used for weight loss.
Not a Forva patient yet?
A licensed provider reviews your intake and decides whether compounded tirzepatide or semaglutide is appropriate for you.
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Compounded medications are not FDA-approved. The FDA does not review compounded drugs for safety, effectiveness, or quality before they are marketed. A state-licensed 503A pharmacy prepares them for an individual patient when a licensed provider decides they are appropriate.
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This page is general information, not medical advice. Updated October 29, 2026.