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Tirzepatide dosage calculator. Your dose in units.
Pick your pharmacy and your label, then your weekly dose. Units depend on your vial's strength, so the same dose can be a different number of units from one pharmacy to the next.
Written by the Belle clinical teamMedically reviewed by Patrick Taylor, MD
Step 1
What do you want to do?
Step 2
Which pharmacy is your medicine from?
Step 3
Which label matches your vial?
Pick your pharmacy first.
Step 4
What is your dose?
Step 5
Which syringe do you use?
Use the size your pharmacy sent. Check the markings on the barrel.
Tirzepatide units chart
Find your weekly dose down the left side and your vial's strength across the top. Units are rounded down to a whole unit. Scroll sideways to see every strength.
| Dose | 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 |
|---|---|---|---|---|---|---|---|---|---|
| 2.5 mg | 25 units | 20 units | 16 units | 14 units | 14 units | 13 units | 12 units | 10 units | 8 units |
| 5 mg | 50 units | 40 units | 33 units | 29 units | 28 units | 27 units | 25 units | 20 units | 16 units |
| 7.5 mg | 75 units | 60 units | 50 units | 44 units | 42 units | 41 units | 37 units | 30 units | 25 units |
| 10 mg | 100 units | 80 units | 66 units | 58 units | 56 units | 55 units | 50 units | 40 units | 33 units |
| 12.5 mg | 125 units (2 syringes: 100 + 25) | 100 units | 83 units | 73 units | 70 units | 69 units | 62 units | 50 units | 41 units |
| 15 mg | 150 units (2 syringes: 100 + 50) | 120 units (2 syringes: 100 + 20) | 100 units | 88 units | 84 units | 83 units | 75 units | 60 units | 50 units |
Which syringe do you have?
The chart assumes a standard 100-unit (1 mL) syringe, where 100 units equal 1 mL. If your pharmacy sent a 50-unit (0.5 mL) or 30-unit (0.3 mL) syringe, the number of units is the same, but a larger dose may need more than one syringe. The calculator above shows the split.
How to read your vial label
Pharmacies print strengths in different ways. These are the label formats that cause the most mix-ups, and what each one means.
Strength printed per half mL
Tirzepatide 10 mg / 0.5 mL
The strength is per half a milliliter, so the real concentration is double the printed number: 20 mg/mL.
An additive that looks like a volume
Tirzepatide 30 mg / 0.5 mg / mL
That's 30 mg/mL of tirzepatide plus 0.5 mg/mL of an additive such as B12 or glycine, not 30 mg per half mL.
The additive is listed first
Niacinamide / Tirzepatide 2 mg / 17.65 mg / mL
The ingredient names set the order of the numbers, so tirzepatide is 17.65 mg/mL, not the first number.
An additive bigger than the drug
Tirzepatide / Pyridoxine 10 mg / 25 mg / mL
The biggest number isn't always the medication; here tirzepatide is 10 mg/mL and the additive is 25 mg/mL.
Three-part labels
Tirzepatide / Glycine / B12 10 mg / 5 mg / 500 mcg / mL
Match each number to its ingredient in order; only the first, 10 mg/mL, is tirzepatide.
Vial totals next to the strength
Tirzepatide 72 mg / 4 mL (18 mg/mL)
The total in the vial is 72 mg across 4 mL; the number that matters for your draw is the per-mL strength, 18 mg/mL.
A strength with no "/mL"
Tirzepatide 18 mg, 4 mL vial
Some labels print only the strength and the vial size. It may be 18 mg per mL (72 mg in the vial), or 18 mg in the whole vial. Check your prescription or message your care team.
Dashes that look like ranges
Tirzepatide / Glycine 8-5 mg/mL (2.5 mL) (20 mg)
The dash separates two ingredients, it isn't a range: tirzepatide is 8 mg/mL, which across 2.5 mL gives the 20 mg total.
Common questions
How many units is 2.5 mg of tirzepatide?
It depends on your vial's strength. At 20 mg/mL, 2.5 mg is 12 units (12.5 rounds down). At 10 mg/mL it's 25 units. The stronger the vial, the fewer units you draw for the same dose.
Is 20 units of tirzepatide 2.5 mg?
Only if your vial is 12.5 mg/mL. At 10 mg/mL, 20 units is 2 mg. At 20 mg/mL, 20 units is 4 mg. Units alone never tell you the dose, so check the strength on your label first.
How many units is 5 mg of tirzepatide?
At 10 mg/mL, 5 mg is 50 units. At 20 mg/mL it's 25 units. At 30 mg/mL it's 16 units (16.67 rounds down).
How many units is 10 mg of tirzepatide?
At 10 mg/mL, 10 mg is 100 units, a full 1 mL syringe. At 15 mg/mL it's 66 units (66.67 rounds down). At 20 mg/mL it's 50 units.
How many mg is 100 units of tirzepatide?
100 units is exactly 1 mL, so the mg equals your vial's mg per mL. At 10 mg/mL, 100 units is 10 mg. At 20 mg/mL, 100 units is 20 mg.
Is 10 units of tirzepatide 1 mg?
Only at 10 mg/mL. At 20 mg/mL, 10 units is 2 mg. Always convert using your own vial's strength rather than a rule of thumb.
How many mL is 40 units?
40 units is 0.4 mL, because 100 units make 1 mL. How many mg that is depends on the vial: 4 mg at 10 mg/mL, 8 mg at 20 mg/mL.
Why does my label show two numbers?
The second number is usually an additive such as B12 or glycine, not part of your dose. Only the tirzepatide strength matters for the calculation. See the label guide on this page for the formats we see most.
What if my dose is more than 100 units?
A standard syringe holds 100 units, so a larger dose is drawn as two syringes. For example, 15 mg at 10 mg/mL is 150 units: one syringe of 100 and one of 50. Follow your prescription, and message your care team if you're unsure.
For educational purposes only. Always follow the dose and instructions your provider gave you. Compounded medications are not evaluated or approved by the FDA.