How to Calculate Mounjaro KwikPen Clicks for Custom Doses

A complete guide to calculating the exact number of clicks you need on your Mounjaro KwikPen for any custom dose amount. Includes formulas, worked examples, and a quick reference table for all 6 pen strengths.

How do you calculate Mounjaro clicks for a custom dose?

Divide your desired dose (in mg) by the pen's mg-per-click value. The formula is: Clicks = Desired mg × 60 ÷ Pen strength. For example, to get 2.5mg from a 10mg pen: 2.5 × 60 ÷ 10 = 15 clicks.

The Click Calculation Formula

Every Mounjaro KwikPen has 60 clicks per standard dose and 4 doses per pen (240 total clicks). Using these constants, you can calculate clicks for any custom dose amount:

Clicks for custom dose:

Clicks = Desired mg × 60 ÷ Pen strength

Total doses from pen:

Doses = (Pen strength × 4) ÷ Desired mg

mg per click:

mg/click = Pen strength ÷ 60

Step-by-Step Calculation

Identify your pen strength

Check the label on your KwikPen. It will show one of six strengths: 2.5mg, 5mg, 7.5mg, 10mg, 12.5mg, or 15mg. This is the mg per standard dose, and each pen contains 4 of these doses.

Determine your desired dose

Decide how many mg you want per injection. This might be your prescribed dose, a half dose, quarter dose, or any custom amount. For example, 3.75mg for a gradual titration.

Apply the formula

Multiply your desired dose by 60, then divide by the pen strength. Round to the nearest whole number since you cannot do partial clicks. Example: 3.75mg from a 7.5mg pen = 3.75 × 60 ÷ 7.5 = 30 clicks.

Calculate how many doses you get

Multiply the pen strength by 4 (total mg in pen), then divide by your desired dose. This tells you how many injections you can get from one pen. Example: 7.5 × 4 ÷ 3.75 = 8 doses.

Quick Reference: mg per Click for All Strengths

Use this table as a quick reference for calculating custom doses. The half-dose and quarter-dose columns show the most common split amounts.

Pen Strength	mg/Click	Half Dose	Quarter Dose
2.5 mg	0.0417 mg	30 clicks (1.25 mg)	15 clicks (0.625 mg)
5 mg	0.0833 mg	30 clicks (2.5 mg)	15 clicks (1.25 mg)
7.5 mg	0.125 mg	30 clicks (3.75 mg)	15 clicks (1.875 mg)
10 mg	0.1667 mg	30 clicks (5 mg)	15 clicks (2.5 mg)
12.5 mg	0.2083 mg	30 clicks (6.25 mg)	15 clicks (3.125 mg)
15 mg	0.25 mg	30 clicks (7.5 mg)	15 clicks (3.75 mg)

Worked Examples

Example 1: Taking 2.5mg from a 10mg pen

Pen strength = 10mg. Desired dose = 2.5mg. Clicks = 2.5 × 60 ÷ 10 = 15 clicks. Total doses from pen = (10 × 4) ÷ 2.5 = 16 doses. That's 16 weekly injections, nearly 4 months from one pen.

Example 2: Taking 3.75mg from a 7.5mg pen

Pen strength = 7.5mg. Desired dose = 3.75mg. Clicks = 3.75 × 60 ÷ 7.5 = 30 clicks. Total doses from pen = (7.5 × 4) ÷ 3.75 = 8 doses. That's 8 weekly injections, or 2 months from one pen.

Example 3: Taking 5mg from a 15mg pen

Pen strength = 15mg. Desired dose = 5mg. Clicks = 5 × 60 ÷ 15 = 20 clicks. Total doses from pen = (15 × 4) ÷ 5 = 12 doses. That's 12 weekly injections, or 3 months from one pen.

What is the mg per click for each Mounjaro pen?

The mg per click varies by pen strength: 2.5mg pen = 0.0417 mg/click, 5mg = 0.0833, 7.5mg = 0.125, 10mg = 0.1667, 12.5mg = 0.2083, and 15mg = 0.25 mg/click. All pens have 60 clicks per standard dose.

Frequently Asked Questions

Can I do partial clicks on a KwikPen?

No, the KwikPen clicks in discrete increments. You should always round to the nearest whole click. The difference between rounding up and down is very small (less than 0.25mg for any pen), so either direction is acceptable.

What happens to leftover medication after my last full dose?

If your custom dose doesn't divide evenly into the total pen capacity, there will be a remainder. You can use the remaining clicks as a smaller partial dose, or discard them. KwikPens are also known to contain approximately 12% overfill.

Do all Mounjaro pens have 60 clicks per dose?

Yes, all six Mounjaro KwikPen strengths (2.5mg through 15mg) use 60 clicks per standard dose. The only difference between pens is the concentration: how many mg each click delivers.

Skip the math and use our calculator

Enter your pen strength and desired dose, and get instant click counts with dose planning features.

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