Free tool
GLP-1 vial reconstitution calculator
Mix compounded semaglutide or tirzepatide vials, mg/mL or mg/0.5mL labels, draw volume, U-100 units, and vial-to-vial transitions.
Arithmetic only, not medical advice. Follow your prescriber and pen/vial label.
Reconstitution & syringe units
Mixing a compounded vial? Enter the vial strength, the bacteriostatic water you added, and your prescribed dose to see the concentration and exactly how many units to draw on a U-100 insulin syringe.
mg
Total drug in the vial
mL
Bacteriostatic water
mg
25units
Draw to the 25-unit mark on a U-100 syringe
Concentration
10mg/mL
Volume
0.25mL
Doses per vial
4