Dosing calculator: your dose at your vial’s strength
My label shows a total, like “60 mg / 3 mL”
Draw to
10 units
on a U-100 insulin syringe
- Volume
- 0.1 mL
- Dose
- 0.25 mg
- Fits in
- 0.3 mL
0.25 mg ÷ 2.5 mg/mL × 100 = 10 units
0.3 mL is the smallest common U-100 syringe that holds 10 units: a smaller barrel spaces the marks further apart, so they are easier to read.
0.25 mg of semaglutide at 2.5 mg/mL = 10 units (0.1 mL) on a U-100 syringe.
One weekly dose of compounded semaglutide at the cheapest program we track: $17.25 at SnagRx ($69/mo all-in ÷ 4 doses, billed monthly).
See price at SnagRxArithmetic only, not medical advice. Your dose is set by your prescriber and the strength is whatever your pharmacy printed on the label. Branded pens (Wegovy, Ozempic, Zepbound, Mounjaro) deliver a set mg dose and Zepbound single-dose vials hold one whole dose, so neither is measured in units. If a result here does not match the instructions you were given, follow your instructions and ask your pharmacist before you inject.
Want the week-by-week ladder and what each step costs? Read the semaglutide dose ladder or the tirzepatide dosage chart.
Semaglutide dosage chart, in units
The weekly schedule from the Wegovy label, with each dose converted to U-100 syringe units at the two common compounded vial strengths, one per column. Use the strength printed on your own vial.
| When | Dose | 2.5 mg/mL | 5 mg/mL |
|---|---|---|---|
| Weeks 1 to 4 | 0.25 mg | 10units (0.1 mL) | 5units (0.05 mL) |
| Weeks 5 to 8 | 0.5 mg | 20units (0.2 mL) | 10units (0.1 mL) |
| Weeks 9 to 12 | 1 mg | 40units (0.4 mL) | 20units (0.2 mL) |
| Weeks 13 to 16 | 1.7 mg | 68units (0.68 mL) | 34units (0.34 mL) |
| Week 17 on | 2.4 mgmaintenance: 1.7 or 2.4 mg | 96units (0.96 mL) | 48units (0.48 mL) |
0.25 mg at 5 mg/mL
5 units
0.3 mL syringe (30 units)
0.5 mg at 5 mg/mL
10 units
0.3 mL syringe (30 units)
1 mg at 5 mg/mL
20 units
0.3 mL syringe (30 units)
1.7 mg at 5 mg/mL
34 units
0.5 mL syringe (50 units)
2.4 mg at 5 mg/mL
48 units
0.5 mL syringe (50 units)
Tirzepatide dosage chart, in units
The weekly schedule from the Zepbound label, with each dose converted to U-100 syringe units at the 4 common compounded vial strengths, one per column. Use the strength printed on your own vial.
| When | Dose | 10 mg/mL | 15 mg/mL | 20 mg/mL | 30 mg/mL |
|---|---|---|---|---|---|
| Weeks 1 to 4 | 2.5 mgstarting dose only | 25units (0.25 mL) | 16.7units (0.167 mL) | 12.5units (0.125 mL) | 8.3units (0.083 mL) |
| Weeks 5 to 8 | 5 mg | 50units (0.5 mL) | 33.3units (0.333 mL) | 25units (0.25 mL) | 16.7units (0.167 mL) |
| After 4+ weeks | 7.5 mg | 75units (0.75 mL) | 50units (0.5 mL) | 37.5units (0.375 mL) | 25units (0.25 mL) |
| After 4+ weeks | 10 mg | 100units (1 mL) | 66.7units (0.667 mL) | 50units (0.5 mL) | 33.3units (0.333 mL) |
| After 4+ weeks | 12.5 mg | 125units (1.25 mL) | 83.3units (0.833 mL) | 62.5units (0.625 mL) | 41.7units (0.417 mL) |
| After 4+ weeks | 15 mgmaximum | 150units (1.5 mL) | 100units (1 mL) | 75units (0.75 mL) | 50units (0.5 mL) |
2.5 mg at 20 mg/mL
12.5 units
0.3 mL syringe (30 units)
5 mg at 20 mg/mL
25 units
0.3 mL syringe (30 units)
7.5 mg at 20 mg/mL
37.5 units
0.5 mL syringe (50 units)
10 mg at 20 mg/mL
50 units
0.5 mL syringe (50 units)
12.5 mg at 20 mg/mL
62.5 units
1 mL syringe (100 units)
15 mg at 20 mg/mL
75 units
1 mL syringe (100 units)
Units at every common vial strength
Every label dose at each strength compounded vials are commonly labelled with: semaglutide 2.5 and 5 mg/mL, tirzepatide 10, 15, 20 and 30 mg/mL. Units are on a U-100 insulin syringe (100 units = 1 mL); the last column is the smallest common syringe that holds the dose in one draw. A different strength on your label? Use the converter.
| Dose | Units | mL | Syringe |
|---|---|---|---|
| 0.25 mg | 10 | 0.1 | 0.3 mL |
| 0.5 mg | 20 | 0.2 | 0.3 mL |
| 1 mg | 40 | 0.4 | 0.5 mL |
| 1.7 mg | 68 | 0.68 | 1 mL |
| 2.4 mg | 96 | 0.96 | 1 mL |
| Dose | Units | mL | Syringe |
|---|---|---|---|
| 0.25 mg | 5 | 0.05 | 0.3 mL |
| 0.5 mg | 10 | 0.1 | 0.3 mL |
| 1 mg | 20 | 0.2 | 0.3 mL |
| 1.7 mg | 34 | 0.34 | 0.5 mL |
| 2.4 mg | 48 | 0.48 | 0.5 mL |
| Dose | Units | mL | Syringe |
|---|---|---|---|
| 2.5 mg | 25 | 0.25 | 0.3 mL |
| 5 mg | 50 | 0.5 | 0.5 mL |
| 7.5 mg | 75 | 0.75 | 1 mL |
| 10 mg | 100 | 1 | 1 mL |
| 12.5 mg | 125 | 1.25 | over 1 mL |
| 15 mg | 150 | 1.5 | over 1 mL |
| Dose | Units | mL | Syringe |
|---|---|---|---|
| 2.5 mg | 16.7 | 0.167 | 0.3 mL |
| 5 mg | 33.3 | 0.333 | 0.5 mL |
| 7.5 mg | 50 | 0.5 | 0.5 mL |
| 10 mg | 66.7 | 0.667 | 1 mL |
| 12.5 mg | 83.3 | 0.833 | 1 mL |
| 15 mg | 100 | 1 | 1 mL |
| Dose | Units | mL | Syringe |
|---|---|---|---|
| 2.5 mg | 12.5 | 0.125 | 0.3 mL |
| 5 mg | 25 | 0.25 | 0.3 mL |
| 7.5 mg | 37.5 | 0.375 | 0.5 mL |
| 10 mg | 50 | 0.5 | 0.5 mL |
| 12.5 mg | 62.5 | 0.625 | 1 mL |
| 15 mg | 75 | 0.75 | 1 mL |
| Dose | Units | mL | Syringe |
|---|---|---|---|
| 2.5 mg | 8.3 | 0.083 | 0.3 mL |
| 5 mg | 16.7 | 0.167 | 0.3 mL |
| 7.5 mg | 25 | 0.25 | 0.3 mL |
| 10 mg | 33.3 | 0.333 | 0.5 mL |
| 12.5 mg | 41.7 | 0.417 | 0.5 mL |
| 15 mg | 50 | 0.5 | 0.5 mL |
Units to mg: what you drew, in milligrams
The same sum backwards: units ÷ 100 × the vial’s mg per mL. At 20 mg/mL, 25 units is 5 mg of tirzepatide; at 2.5 mg/mL, 20 units is 0.5 mg of semaglutide.
| Units | 2.5 mg/mL | 5 mg/mL |
|---|---|---|
| 5 u | 0.125 | 0.25 |
| 10 u | 0.25 | 0.5 |
| 15 u | 0.375 | 0.75 |
| 20 u | 0.5 | 1 |
| 25 u | 0.625 | 1.25 |
| 30 u | 0.75 | 1.5 |
| 40 u | 1 | 2 |
| 50 u | 1.25 | 2.5 |
| 60 u | 1.5 | 3 |
| 75 u | 1.875 | 3.75 |
| 100 u | 2.5 | 5 |
| Units | 10 mg/mL | 15 mg/mL | 20 mg/mL | 30 mg/mL |
|---|---|---|---|---|
| 5 u | 0.5 | 0.75 | 1 | 1.5 |
| 10 u | 1 | 1.5 | 2 | 3 |
| 15 u | 1.5 | 2.25 | 3 | 4.5 |
| 20 u | 2 | 3 | 4 | 6 |
| 25 u | 2.5 | 3.75 | 5 | 7.5 |
| 30 u | 3 | 4.5 | 6 | 9 |
| 40 u | 4 | 6 | 8 | 12 |
| 50 u | 5 | 7.5 | 10 | 15 |
| 60 u | 6 | 9 | 12 | 18 |
| 75 u | 7.5 | 11.25 | 15 | 22.5 |
| 100 u | 10 | 15 | 20 | 30 |
Microdosing units chart: tirzepatide and semaglutide
Microdosing means a dose below the label’s starting dose: under 2.5 mg of tirzepatide (Zepbound’s starting dose) or under 0.25 mg of semaglutide (Wegovy’s). It is off-label, there is no label schedule for it, and the dose is your prescriber’s call. These tables are the arithmetic for a dose already written, nothing more. Very small volumes are hard to measure accurately; ask your pharmacist which syringe to use.
tirzepatide, below 2.5 mg
| Dose | Vial 10 mg/mL | Vial 20 mg/mL |
|---|---|---|
| 0.5 mg | 5 units0.05 mL | 2.5 units0.025 mL |
| 1 mg | 10 units0.1 mL | 5 units0.05 mL |
| 1.5 mg | 15 units0.15 mL | 7.5 units0.075 mL |
| 2 mg | 20 units0.2 mL | 10 units0.1 mL |
semaglutide, below 0.25 mg
| Dose | Vial 2.5 mg/mL | Vial 5 mg/mL |
|---|---|---|
| 0.05 mg | 2 units0.02 mL | 1 units0.01 mL |
| 0.1 mg | 4 units0.04 mL | 2 units0.02 mL |
| 0.15 mg | 6 units0.06 mL | 3 units0.03 mL |
| 0.2 mg | 8 units0.08 mL | 4 units0.04 mL |
Programs we track that sell a microdosing plan: Enhance MD from $169/mo on a 12-month plan. What it saves and what it doesn't: microdosing GLP-1s.
What one dose costs
The cheapest compounded injection programs we track, all-in monthly price divided by four weekly doses. Most of these programs publish one monthly price rather than a price per dose, so ask whether yours rises as you move up the schedule.
Compounded semaglutide
| Program | Per month | Per weekly dose |
|---|---|---|
| SnagRxmonthly | $69 | $17 |
| Embody12-month prepay | $69 | $17 |
| Collectivemonthly | $75 | $18 |
| CoreAge Rxmonthly | $99 | $24 |
| Sprout Health12-month prepay | $99 | $24 |
Compounded tirzepatide
| Program | Per month | Per weekly dose |
|---|---|---|
| Collectivemonthly | $85 | $21 |
| SnagRxmonthly | $119 | $29 |
| Embody12-month prepay | $119 | $29 |
| CoreAge Rxmonthly | $149 | $37 |
| Sprout Health12-month prepay | $149 | $37 |
Program links pay us a commission. The order is the all-in monthly price, never what anyone pays us. How we earn.
Dosage chart: common questions
How many units is 0.25 mg of semaglutide?
10 units on a U-100 syringe from a 2.5 mg/mL vial, or 5 units from a 5 mg/mL vial. The strength is on your pharmacy label; use that one.
How many units is 2.5 mg of tirzepatide?
25 units from a 10 mg/mL vial, 16.7 from 15 mg/mL, 12.5 from 20 mg/mL and 8.3 from 30 mg/mL. Use the strength printed on your own vial.
How do I convert mg to units?
Divide your dose in mg by the vial concentration in mg per mL to get mL, then multiply by 100 to get units on a U-100 insulin syringe. Example: 0.5 mg ÷ 2.5 mg/mL = 0.2 mL = 20 units.
How many units is 5 mg of tirzepatide?
50 units from a 10 mg/mL vial, 33.3 from 15 mg/mL, 25 from 20 mg/mL and 16.7 from 30 mg/mL. Use the concentration printed on your own vial.
How many units is 10 mg of tirzepatide?
100 units (1 mL, a full 1 mL syringe) from a 10 mg/mL vial, 66.7 from 15 mg/mL, 50 from 20 mg/mL and 33.3 from 30 mg/mL.
How many mg is 20 units of semaglutide?
0.5 mg from a 2.5 mg/mL vial, or 1 mg from a 5 mg/mL vial. Units to mg is the same sum backwards: units ÷ 100 × the vial's mg per mL.
How many mg is 50 units of tirzepatide?
5 mg from a 10 mg/mL vial, 7.5 mg from 15 mg/mL, 10 mg from 20 mg/mL and 15 mg from 30 mg/mL.
What size syringe holds my dose?
U-100 insulin syringes come in three common sizes: 0.3 mL (30 units), 0.5 mL (50 units) and 1 mL (100 units). The smallest one that holds your dose in one draw spaces the marks furthest apart. Use the syringe your pharmacy supplied or recommends.
Are Wegovy or Zepbound pens measured in units?
No. Branded pens deliver a set dose in mg, and Zepbound single-dose vials hold one whole dose. Converting to units only applies to compounded multi-dose vials drawn with an insulin syringe.
How do I calculate a microdose in units?
The same way as any dose: your dose in mg divided by the vial's mg per mL, times 100. At 10 mg/mL, 1 mg of tirzepatide is 10 units; at 2.5 mg/mL, 0.1 mg of semaglutide is 4 units. Very small volumes are hard to measure, so ask your pharmacist which syringe to use.
Is microdosing tirzepatide or semaglutide on the label?
No. The lowest labelled doses are the starting doses, 2.5 mg for Zepbound and 0.25 mg for Wegovy. Microdosing below them is off-label, there is no label schedule for it, and the dose is your prescriber's call.
What is the semaglutide dosing schedule?
On the Wegovy label: 0.25 mg weekly for weeks 1 to 4, 0.5 mg for weeks 5 to 8, 1 mg for weeks 9 to 12, 1.7 mg for weeks 13 to 16, then a maintenance dose of 1.7 or 2.4 mg. Compounded semaglutide is dosed by your prescriber.
What is the tirzepatide dosing schedule?
On the Zepbound label: 2.5 mg weekly for 4 weeks, then 5 mg, rising in 2.5 mg steps after at least 4 weeks on each dose, to a maintenance dose of 5, 10 or 15 mg. 15 mg is the maximum.
How much does one dose of compounded semaglutide cost?
At the cheapest program we track, SnagRx, $17 per weekly dose: $69 a month all-in divided by four weekly injections.
Where these facts come from
We track prices. Every clinical and manufacturer claim about semaglutide and tirzepatide dosing on this page is quoted here in its source’s own words, with the date we read it. We do not write medical guidance and we do not tell anyone what dose to take.
4 sources · read October 2026
- 01read October 2026
Wegovy prescribing information, Table 1 and maintenance dosageTable 1. Recommended Starting Dosage and Dosage Escalation: Starting Dosage, weeks 1 through 4, 0.25 mg
Dosage Escalation, weeks 5 through 8, 0.5 mg
weeks 9 through 12, 1 mg
weeks 13 through 16, 1.7 mg
Maintenance Dosage, 17 and onward.
… The maintenance dosage of WEGOVY for weight reduction in adults is either 1.7 mg or 2.4 mg (recommended) injected subcutaneously once weekly.
… If patients do not tolerate a dose during dosage escalation, consider delaying dosage escalation for 4 weeks.
- 02read October 2026
Zepbound prescribing information, dosageThe recommended starting dosage of ZEPBOUND for all indications is 2.5 mg injected subcutaneously once weekly for 4 weeks. The 2.5 mg dosage is for treatment initiation and is not approved as a maintenance dosage.
… After 4 weeks, increase the dosage to 5 mg injected subcutaneously once weekly. The dosage may be increased in 2.5 mg increments, after at least 4 weeks on the current dose
… The recommended maintenance dosage is 5 mg, 10 mg, or 15 mg, injected subcutaneously once weekly.
… The maximum dosage of ZEPBOUND for all indications is 15 mg injected subcutaneously once weekly.
- 03read October 2026
FDA, concerns with unapproved GLP-1 drugs used for weight lossFDA received multiple reports of adverse events, some requiring hospitalization, that may be related to dosing errors associated with compounded injectable semaglutide products. These dosing errors resulted from patients measuring and self-administering incorrect doses of the drug, and in some cases, health care professionals miscalculating doses of the drug.
… The agency also encourages patients to talk with their health care provider or compounder about how to measure and administer the intended dose of compounded semaglutide or tirzepatide.
- 04read October 2026
FDA Enforcement Report and warning letters, compounded vial labelsTirzepatide Injections, 10mg/mL
… Tirzepatide Injections, 20mg/mL
… Tirzepatide Injections, 30mg/mL
… Tirzepatide/Cyanocobalamin Injectable, 15mg/1mg/mL
… Semaglutide 5mg/2ml (2.5mg/ml) 2ml, Tirzepatide 60mg/3ml (20mg/ml) 3ml
… Tirzepatide Injection 10 mg/mL and Semaglutide Injection 2.5 mg/mL
… Semaglutide/Cyanocobalamin 5mg/0.2mg/ml, 2ml-vial