Every full dose on a Mounjaro KwikPen is 60 clicks, and that is true of all six strengths — the dial is calibrated the same way in each. What changes between pens is how much tirzepatide one click delivers.
So the arithmetic for any part-dose is one line:
clicks = (your dose ÷ the pen's strength) × 60
On a 15 mg pen, 2 mg is 2 ÷ 15 × 60 = 8 clicks. On a 10 mg pen, the same 2 mg is 12 clicks. The dose did not change; the pen did.
What one click is worth, pen by pen
| Pen strength | One click | Full dose |
|---|---|---|
| 2.5 mg | 0.042 mg | 60 clicks |
| 5 mg | 0.083 mg | 60 clicks |
| 7.5 mg | 0.125 mg | 60 clicks |
| 10 mg | 0.167 mg | 60 clicks |
| 12.5 mg | 0.208 mg | 60 clicks |
| 15 mg | 0.25 mg | 60 clicks |
The full click chart
Read down to your pen, across to the dose you are after. A blank cell is a dose larger than the pen delivers in one go — the dial stops at 60.
| Pen | 2.5 mg | 5 mg | 7.5 mg | 10 mg | 12.5 mg | 15 mg |
|---|---|---|---|---|---|---|
| 2.5 mg | 60 clicks | — | — | — | — | — |
| 5 mg | 30 clicks | 60 clicks | — | — | — | — |
| 7.5 mg | 20 clicks | 40 clicks | 60 clicks | — | — | — |
| 10 mg | 15 clicks | 30 clicks | 45 clicks | 60 clicks | — | — |
| 12.5 mg | 12 clicks | 24 clicks | 36 clicks | 48 clicks | 60 clicks | — |
| 15 mg | 10 clicks | 20 clicks | 30 clicks | 40 clicks | 50 clicks | 60 clicks |
Counting without losing track
The dial gives one click per increment and no display, so the count is yours to keep. Three things make it survivable:
- Count out loud, in threes or fives. Twenty clicks counted singly is twenty chances to lose the thread; four groups of five is four.
- Write the number down before you inject, not after. Once the dose is delivered there is nothing left to check it against.
- Keep the running total per pen. A KwikPen holds four full doses — 240 clicks in total — so part-doses drain it at a rate you have to track yourself to know when it is empty.
When the dose does not land on a click
Clicks are indivisible, so a dose only comes out exactly when it divides cleanly by what one click delivers. On a 15 mg pen every click is 0.25 mg, so 2 mg, 2.25 mg and 2.5 mg are all reachable and 2.1 mg is not — it falls between click 8 and click 9. Pens with finer increments (a 5 mg pen clicks in 0.083 mg) reach more values, but none of them reach all of them.
What this page is not
The KwikPen is licensed to deliver its full labelled dose. Dialling a part-dose by counting clicks is off-label use of the device, and the arithmetic above describes how the pen is calibrated rather than recommending any particular amount. If you are counting clicks, it should be because the person who prescribed your medication asked you to.
