Reconstitution calculator
Powder in the vial + diluent → how much of it corresponds to the amount you were prescribed? The calculator only converts. It does not suggest a dose.
Just a calculation aid. The amount is set by your doctor or stated in the package leaflet. Double-check every result yourself before you use it. With untested products, even the mg figure on the vial is only an assumption.
How much diluent do you need so the amount lands on a round mark?
How it is calculated
Concentration (mg/mL) = active ingredient in vial ÷ diluentVolume (mL) = desired amount ÷ concentration- U-100 syringe and pen:
1 unit or 1 click = 0.01 mL. Nasal spray:sprays = volume ÷ spray volume
Example: 5 mg in 2 mL gives 2.5 mg/mL. 0.25 mg of that is 0.1 mL, i.e. 10 units.
FAQ on converting
How many units is 0.1 mL on an insulin syringe?
On a U-100 syringe, 0.1 mL is exactly 10 units. 1 mL equals 100 units, so 1 unit is 0.01 mL.
What does “reconstitution” mean?
Dissolving a freeze-dried powder (lyophilisate) with a liquid. How much liquid you use determines the concentration – and therefore how much volume a given amount of active ingredient takes up.
Does more water change the amount of active ingredient?
No. More liquid only dilutes the solution. The amount of active ingredient in the vial stays the same, but you draw up more volume for the same amount of active ingredient.
What is the difference between mg and mcg?
1 mg = 1,000 mcg (micrograms). Many mix-ups happen exactly here – the calculator converts both units.
How long does a mixed solution keep?
That depends on the active ingredient and the diluent, and for approved medicines it is stated in the package leaflet. As a general rule: store refrigerated, protect from light, do not freeze, and discard if cloudy.