Tirzepatide units to mg chart
Every unit mark converted to milligrams and every milligram converted back, for 5, 10, 15, 20, 30 and 60 mg vials at four water volumes.
25 printable pages: dosing cards for the twelve most-used compounds at three water volumes, titration planners, a vial log, and five pages on what to do when it has already gone wrong.
A unit is a volume, not a dose. One unit on a U-100 insulin syringe is 0.01 mL of liquid, whatever is dissolved in it, so a figure in milligrams only becomes a figure in units once you know the concentration, and the concentration is whatever you made it when you added the water. That is why every answer below names the vial and the water volume it assumes. Tirzepatide vials come in 5, 10, 15, 20, 30 and 60 mg. The licensed product is a pre-filled pen at a concentration set by the manufacturer and dialled in milligrams, so unit counts from a pen do not carry over to a vial you reconstituted yourself.
How many units is 2.5 mg of tirzepatide?
25 units on a U-100 insulin syringe, from a 30 mg vial reconstituted with 3 mL of bacteriostatic water. That works out at 10 mg/mL, so 2.5 mg is 0.25 mL. The setup is the whole answer: the same 2.5 mg lands on a different mark at any other concentration, as the table shows.
| Vial | BAC water | Concentration | 2.5 mg = | U-100 units |
|---|---|---|---|---|
| 5 mg | 1 mL | 5 mg/mL | 0.5 mL | 50 units |
| 5 mg | 2 mL | 2.5 mg/mL | 1 mL | 100 units |
| 10 mg | 1 mL | 10 mg/mL | 0.25 mL | 25 units |
| 10 mg | 2 mL | 5 mg/mL | 0.5 mL | 50 units |
| 10 mg | 3 mL | 3.33 mg/mL | 0.75 mL | 75 units |
| 15 mg | 2 mL | 7.5 mg/mL | 0.333 mL | 33.3 units |
| 15 mg | 3 mL | 5 mg/mL | 0.5 mL | 50 units |
| 20 mg | 2 mL | 10 mg/mL | 0.25 mL | 25 units |
| 20 mg | 4 mL | 5 mg/mL | 0.5 mL | 50 units |
| 30 mg | 2 mL | 15 mg/mL | 0.167 mL | 16.7 units |
| 30 mg | 3 mL | 10 mg/mL | 0.25 mL | 25 units |
| 30 mg | 4 mL | 7.5 mg/mL | 0.333 mL | 33.3 units |
| 60 mg | 3 mL | 20 mg/mL | 0.125 mL | 12.5 units |
| 60 mg | 4 mL | 15 mg/mL | 0.167 mL | 16.7 units |
How many mg is 20 units of tirzepatide?
2 mg, from a 30 mg vial reconstituted with 3 mL of bacteriostatic water (10 mg/mL). Twenty units is 0.2 mL, and 0.2 mL of that solution carries 2 mg. Draw the same 20 units from a 30 mg vial mixed with only 2 mL and it is 3 mg, because the liquid is half again as strong.
| Vial | BAC water | Concentration | 20 units = |
|---|---|---|---|
| 5 mg | 2 mL | 2.5 mg/mL | 0.5 mg |
| 10 mg | 1 mL | 10 mg/mL | 2 mg |
| 10 mg | 2 mL | 5 mg/mL | 1 mg |
| 15 mg | 3 mL | 5 mg/mL | 1 mg |
| 20 mg | 2 mL | 10 mg/mL | 2 mg |
| 20 mg | 4 mL | 5 mg/mL | 1 mg |
| 30 mg | 2 mL | 15 mg/mL | 3 mg |
| 30 mg | 3 mL | 10 mg/mL | 2 mg |
| 30 mg | 4 mL | 7.5 mg/mL | 1.5 mg |
| 60 mg | 3 mL | 20 mg/mL | 4 mg |
| 60 mg | 4 mL | 15 mg/mL | 3 mg |
How many mg is 40 units of tirzepatide?
4 mg, again from a 30 mg vial in 3 mL of bacteriostatic water (10 mg/mL). Forty units is 0.4 mL. It is exactly double the 20 unit answer, because units and milligrams move together in a straight line once the concentration is fixed; only the concentration bends the relationship.
| Vial | BAC water | Concentration | 40 units = |
|---|---|---|---|
| 5 mg | 2 mL | 2.5 mg/mL | 1 mg |
| 10 mg | 1 mL | 10 mg/mL | 4 mg |
| 10 mg | 2 mL | 5 mg/mL | 2 mg |
| 15 mg | 3 mL | 5 mg/mL | 2 mg |
| 20 mg | 2 mL | 10 mg/mL | 4 mg |
| 20 mg | 4 mL | 5 mg/mL | 2 mg |
| 30 mg | 2 mL | 15 mg/mL | 6 mg |
| 30 mg | 3 mL | 10 mg/mL | 4 mg |
| 30 mg | 4 mL | 7.5 mg/mL | 3 mg |
| 60 mg | 3 mL | 20 mg/mL | 8 mg |
| 60 mg | 4 mL | 15 mg/mL | 6 mg |
Compounded tirzepatide dosage in units
At 10 mg/mL, the most common compounded strength, the ladder is 25, 50, 75, 100, 125, 150 units for 2.5, 5, 7.5, 10, 12.5, 15 mg. At 20 mg/mL every one of those halves, so 2.5 mg is 12.5 units and 15 mg is 75. Compounded tirzepatide usually arrives already in solution at a concentration printed on the label rather than as a powder you mix, so the conversion starts from that number instead of from a vial and a water volume. There is no standard concentration, so read the label rather than copying someone else's unit count. Compounded tirzepatide is not the licensed product and is not interchangeable with it; large-scale 503B compounding of it has not been lawful since March 2025.
| Concentration | 2.5 mg | 5 mg | 7.5 mg | 10 mg | 12.5 mg | 15 mg |
|---|---|---|---|---|---|---|
| 5 mg/mL | 50 | 100 | 150* | 200* | 250* | 300* |
| 10 mg/mL | 25 | 50 | 75 | 100 | 125* | 150* |
| 12.5 mg/mL | 20 | 40 | 60 | 80 | 100 | 120* |
| 20 mg/mL | 12.5 | 25 | 37.5 | 50 | 62.5 | 75 |
| 25 mg/mL | 10 | 20 | 30 | 40 | 50 | 60 |
The full chart: mg to units
Every vial size at 1, 2, 3 and 4 mL of bacteriostatic water, with the 2.5 to 15 mg ladder in U-100 units. A dash means the dose is bigger than the whole vial.
| Vial | Water | Conc. | 2.5 mg | 5 mg | 7.5 mg | 10 mg | 12.5 mg | 15 mg |
|---|---|---|---|---|---|---|---|---|
| 5 mg | 1 mL | 5 mg/mL | 50 | 100 | - | - | - | - |
| 5 mg | 2 mL | 2.5 mg/mL | 100 | 200* | - | - | - | - |
| 5 mg | 3 mL | 1.67 mg/mL | 150* | 300* | - | - | - | - |
| 5 mg | 4 mL | 1.25 mg/mL | 200* | 400* | - | - | - | - |
| 10 mg | 1 mL | 10 mg/mL | 25 | 50 | 75 | 100 | - | - |
| 10 mg | 2 mL | 5 mg/mL | 50 | 100 | 150* | 200* | - | - |
| 10 mg | 3 mL | 3.33 mg/mL | 75 | 150* | 225* | 300* | - | - |
| 10 mg | 4 mL | 2.5 mg/mL | 100 | 200* | 300* | 400* | - | - |
| 15 mg | 1 mL | 15 mg/mL | 16.7 | 33.3 | 50 | 66.7 | 83.3 | 100 |
| 15 mg | 2 mL | 7.5 mg/mL | 33.3 | 66.7 | 100 | 133.3* | 166.7* | 200* |
| 15 mg | 3 mL | 5 mg/mL | 50 | 100 | 150* | 200* | 250* | 300* |
| 15 mg | 4 mL | 3.75 mg/mL | 66.7 | 133.3* | 200* | 266.7* | 333.3* | 400* |
| 20 mg | 1 mL | 20 mg/mL | 12.5 | 25 | 37.5 | 50 | 62.5 | 75 |
| 20 mg | 2 mL | 10 mg/mL | 25 | 50 | 75 | 100 | 125* | 150* |
| 20 mg | 3 mL | 6.67 mg/mL | 37.5 | 75 | 112.5* | 150* | 187.5* | 225* |
| 20 mg | 4 mL | 5 mg/mL | 50 | 100 | 150* | 200* | 250* | 300* |
| 30 mg | 1 mL | 30 mg/mL | 8.3 | 16.7 | 25 | 33.3 | 41.7 | 50 |
| 30 mg | 2 mL | 15 mg/mL | 16.7 | 33.3 | 50 | 66.7 | 83.3 | 100 |
| 30 mg | 3 mL | 10 mg/mL | 25 | 50 | 75 | 100 | 125* | 150* |
| 30 mg | 4 mL | 7.5 mg/mL | 33.3 | 66.7 | 100 | 133.3* | 166.7* | 200* |
| 60 mg | 1 mL | 60 mg/mL | 4.2 | 8.3 | 12.5 | 16.7 | 20.8 | 25 |
| 60 mg | 2 mL | 30 mg/mL | 8.3 | 16.7 | 25 | 33.3 | 41.7 | 50 |
| 60 mg | 3 mL | 20 mg/mL | 12.5 | 25 | 37.5 | 50 | 62.5 | 75 |
| 60 mg | 4 mL | 15 mg/mL | 16.7 | 33.3 | 50 | 66.7 | 83.3 | 100 |
The full chart: units to mg
The same setups read the other way, for when you know the mark you drew to and want the dose. Nothing is marked out of range here, because a draw can never exceed the liquid in the vial: at 1 mL of water, 100 units is the entire contents.
| Vial | Water | Conc. | 10 u | 20 u | 25 u | 30 u | 40 u | 50 u | 60 u | 80 u | 100 u |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 5 mg | 1 mL | 5 mg/mL | 0.5 | 1 | 1.25 | 1.5 | 2 | 2.5 | 3 | 4 | 5 |
| 5 mg | 2 mL | 2.5 mg/mL | 0.25 | 0.5 | 0.625 | 0.75 | 1 | 1.25 | 1.5 | 2 | 2.5 |
| 5 mg | 3 mL | 1.67 mg/mL | 0.167 | 0.333 | 0.417 | 0.5 | 0.667 | 0.833 | 1 | 1.333 | 1.667 |
| 5 mg | 4 mL | 1.25 mg/mL | 0.125 | 0.25 | 0.312 | 0.375 | 0.5 | 0.625 | 0.75 | 1 | 1.25 |
| 10 mg | 1 mL | 10 mg/mL | 1 | 2 | 2.5 | 3 | 4 | 5 | 6 | 8 | 10 |
| 10 mg | 2 mL | 5 mg/mL | 0.5 | 1 | 1.25 | 1.5 | 2 | 2.5 | 3 | 4 | 5 |
| 10 mg | 3 mL | 3.33 mg/mL | 0.333 | 0.667 | 0.833 | 1 | 1.333 | 1.667 | 2 | 2.667 | 3.333 |
| 10 mg | 4 mL | 2.5 mg/mL | 0.25 | 0.5 | 0.625 | 0.75 | 1 | 1.25 | 1.5 | 2 | 2.5 |
| 15 mg | 1 mL | 15 mg/mL | 1.5 | 3 | 3.75 | 4.5 | 6 | 7.5 | 9 | 12 | 15 |
| 15 mg | 2 mL | 7.5 mg/mL | 0.75 | 1.5 | 1.875 | 2.25 | 3 | 3.75 | 4.5 | 6 | 7.5 |
| 15 mg | 3 mL | 5 mg/mL | 0.5 | 1 | 1.25 | 1.5 | 2 | 2.5 | 3 | 4 | 5 |
| 15 mg | 4 mL | 3.75 mg/mL | 0.375 | 0.75 | 0.938 | 1.125 | 1.5 | 1.875 | 2.25 | 3 | 3.75 |
| 20 mg | 1 mL | 20 mg/mL | 2 | 4 | 5 | 6 | 8 | 10 | 12 | 16 | 20 |
| 20 mg | 2 mL | 10 mg/mL | 1 | 2 | 2.5 | 3 | 4 | 5 | 6 | 8 | 10 |
| 20 mg | 3 mL | 6.67 mg/mL | 0.667 | 1.333 | 1.667 | 2 | 2.667 | 3.333 | 4 | 5.333 | 6.667 |
| 20 mg | 4 mL | 5 mg/mL | 0.5 | 1 | 1.25 | 1.5 | 2 | 2.5 | 3 | 4 | 5 |
| 30 mg | 1 mL | 30 mg/mL | 3 | 6 | 7.5 | 9 | 12 | 15 | 18 | 24 | 30 |
| 30 mg | 2 mL | 15 mg/mL | 1.5 | 3 | 3.75 | 4.5 | 6 | 7.5 | 9 | 12 | 15 |
| 30 mg | 3 mL | 10 mg/mL | 1 | 2 | 2.5 | 3 | 4 | 5 | 6 | 8 | 10 |
| 30 mg | 4 mL | 7.5 mg/mL | 0.75 | 1.5 | 1.875 | 2.25 | 3 | 3.75 | 4.5 | 6 | 7.5 |
| 60 mg | 1 mL | 60 mg/mL | 6 | 12 | 15 | 18 | 24 | 30 | 36 | 48 | 60 |
| 60 mg | 2 mL | 30 mg/mL | 3 | 6 | 7.5 | 9 | 12 | 15 | 18 | 24 | 30 |
| 60 mg | 3 mL | 20 mg/mL | 2 | 4 | 5 | 6 | 8 | 10 | 12 | 16 | 20 |
| 60 mg | 4 mL | 15 mg/mL | 1.5 | 3 | 3.75 | 4.5 | 6 | 7.5 | 9 | 12 | 15 |
Figures in milligrams. Units on a standard U-100 insulin syringe, where 100 units is 1 mL. * marks a draw over 100 units, which needs more than one syringe.
Doses per vial, and how long one lasts
Tirzepatide is dosed once a week, so the number of doses in a vial is also the number of weeks it covers. Water does not change this: it changes the size of the draw, not how much drug is in the vial.
| Vial | 2.5 mg | 5 mg | 7.5 mg | 10 mg | 12.5 mg | 15 mg |
|---|---|---|---|---|---|---|
| 5 mg | 2 | 1 | - | - | - | - |
| 10 mg | 4 | 2 | 1 | 1 | - | - |
| 15 mg | 6 | 3 | 2 | 1 | 1 | 1 |
| 20 mg | 8 | 4 | 2 | 2 | 1 | 1 |
| 30 mg | 12 | 6 | 4 | 3 | 2 | 2 |
| 60 mg | 24 | 12 | 8 | 6 | 4 | 4 |
Whole doses per vial, rounded down. At once-weekly dosing each dose is a week, so a 30 mg vial is 12 weeks at 2.5 mg and 2 weeks at 15 mg. Neither figure allows for the small amount left in the vial or lost in the syringe.
Why the same dose is a different number of units
Concentration is vial strength divided by water added. Volume is dose divided by concentration. Units is volume times 100 on a U-100 barrel. Nothing else is involved. Put 30 mg in 3 mL and you have 10 mg/mL, so 5 mg is 0.5 mL and 50 units. Put the same 30 mg in 2 mL and you have 15 mg/mL, so 5 mg is 0.333 mL and 33.3 units. The dose did not change. Only the mark did. This is why a unit count copied from a forum post is meaningless unless the vial size and the water volume came with it, and why it is worth writing the water volume on the vial in marker the moment you mix it.
If your syringe is U-40 rather than U-100, multiply the volume by 40 instead of 100. Mixing the two scales up is a 2.5 times error in either direction, so check the barrel first on the syringe page.
Common questions
- How many units is 2.5 mg of tirzepatide?
- 25 units on a U-100 syringe from a 30 mg vial reconstituted with 3 mL of bacteriostatic water, which is 10 mg/mL. From the same vial with 2 mL it is 16.7 units, and from a 10 mg vial with 2 mL it is 50 units. The vial and the water decide it.
- How many mg is 20 units of tirzepatide?
- 2 mg from a 30 mg vial in 3 mL of water. From a 30 mg vial in 2 mL it is 3 mg, and from a 10 mg vial in 2 mL it is 1 mg. Twenty units is always 0.2 mL; what is in that 0.2 mL depends on the concentration.
- How many mg is 40 units of tirzepatide?
- 4 mg from a 30 mg vial in 3 mL of water, double the 20 unit answer. From a 10 mg vial in 2 mL it is 2 mg, and from a 60 mg vial in 3 mL it is 8 mg.
- What water volume makes the units easiest to read?
- Whichever one puts your usual dose between about 10 and 50 units, where the barrel is easiest to read. Mixing to 10 mg/mL is popular because the unit count is then just the dose in milligrams times ten.
- Do pen units mean the same thing?
- No. A pre-filled pen is dialled in milligrams at a fixed concentration set by the manufacturer. Insulin syringe units measure volume. The two numbers are not comparable, and a pen figure should never be copied onto a syringe.
Common conversions
The same three-step maths, pre-filled for the doses people ask about most. Units on a U-100 insulin syringe, where 100 units is 1 mL.
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