Free calculator
Dose Calculator
Enter your vial amount, the water you add, and your dose to see how many units to draw on a U-100 or U-40 syringe.
This tool does arithmetic on numbers you enter. It does not recommend doses. Talk to your prescriber about your protocol.
- Concentration
- Volume per dose
- Units to draw
- Doses per vial
Results
How it works
- 1
Concentration = vial amount ÷ water added
- 2
Volume per dose = dose amount ÷ concentration
- 3
Units to draw = volume per dose × 100 for a U-100 syringe, or × 40 for a U-40 syringe
Worked example
A 10 mg vial with 2 ml of bacteriostatic water gives 5 mg/ml. A 1 mg dose is 0.2 ml, which is 20 units on a U-100 syringe.
Peptisy for iPhone
Log doses, track vials, and generate a report for your prescriber. Data stays on your device and your own iCloud.
Frequently asked questions
How many units is my dose?
Divide your dose by the vial concentration to get the volume in ml, then multiply by 100 for a U-100 syringe or 40 for a U-40 syringe.
Does it handle mg and mcg?
Yes. Set the unit toggle to mcg and the calculator uses mcg consistently across the vial amount and dose amount.
Does it account for reconstitution?
Yes. Enter your vial amount and the water you added and the calculator works out the concentration before computing your dose volume.
Can I use it for any compound?
Yes. The calculator works on any vial amount, water amount, and dose you enter, regardless of compound.
What happens if my dose is larger than the vial?
The calculator shows a warning instead of a result, because that dose cannot be drawn from the vial as reconstituted.
Does Peptisy give medical advice?
No. Peptisy performs arithmetic on the numbers you enter. It does not recommend, adjust, or suggest a dose. Talk to your prescriber about your protocol.
This tool does arithmetic on numbers you enter. It does not recommend doses. Talk to your prescriber about your protocol.