Peptide pen calculator
For reusable pens you load yourself. Enter what's in the cartridge and your dose to see what to dial.
Dial to
15u
You actually get
500 mcg
Injections per dose
1
Doses per cartridge
20
Assumes a reusable pen marked in insulin units (100 units = 1 mL). Check your pen's manual; some pens count differently. Brand-name pens like Ozempic are already measured and don't need this.
Is this for Ozempic or Mounjaro pens?
No. Brand-name pens are already measured. This is for reusable pens with a cartridge you fill.
Why doesn't the dose come out exact?
A pen only moves in whole clicks. If your dose falls between two clicks, the pen gives the nearest one. Changing the liquid amount usually fixes it.
What's the math?
Strength = cartridge mg ÷ cartridge mL. Units = dose ÷ strength × 100, rounded to the nearest click.