Updated 6 Nov 2026
Preparation calculator
Your vet prescribed a dose? Work out the concentration, how far to fill the syringe and how many doses are in the vial. It never suggests a dose.
Fill in the dose your vet prescribed, the vial content and the water to see the result.
Double-check every number with your vet before you give anything. Units assume a U-100 syringe, where 1 unit = 0.01 ml.
How the numbers are worked out
- Concentration is the vial content in mg, divided by the water added in ml.
- Volume to draw up is the prescribed dose, divided by the concentration.
- On a U-100 syringe, units are the volume in ml, multiplied by 100.
- Doses per vial is the vial content, divided by the prescribed dose.
Questions about the calculator
Does this calculator recommend a dose?
No. It has no default dose, no presets and no per-weight maths. It only converts the dose your vet prescribed into syringe units.
What is a U-100 syringe?
An insulin syringe marked in units, where 100 units equal 1 ml. So 1 unit is 0.01 ml.
What if I mix up mcg and mg?
1 mg is 1,000 mcg, so a mix-up changes the amount a thousandfold. Check the unit with your vet before you draw anything up.
No prescribed dose? Ask a vet
A licensed vet by video or chat can tell you whether anything makes sense for your animal.