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Calculator/Somatropin (HGH)

Medication

Somatropin (HGH) reconstitution calculator

Somatropin labels let you choose how much liquid to add, within a range. That choice, not the number on the vial, decides where your dose sits on the syringe.

Dose to syringe mark calculator

Which somatropin vial do you have?Read the box or the label

Serostimadd 0.5 to 1 mL
mg
Zomactonadd 1 to 5 mL
mg
Zomactonadd 1 mL
mg
Omnitrope
mg/mL
Arithmetic only, not a dose recommendation. This converts the numbers you typed and nothing more. If anything here does not match your prescription or your label, stop and ask your pharmacist.
Full notice

This tool does not choose or check a medication, dose, concentration, diluent, syringe or route. It works from the numbers on your prescription and label, as you type them. A mark on a U-100 syringe is a volume, not a medication dose in units or IU. If anything here differs from what you were given, or you are unsure, do not prepare or inject: ask the prescriber or the dispensing pharmacist. No preset is a dose. Presets exist for FDA-approved products; any other vial is arithmetic on your own label.

  • Arithmetic: checked against 24 worked examples, last run 2026-09-05. See the examples
  • Vial presets: read from current FDA labels, checked 2026-09-04. Sources
  • Clinical review: none. No clinician reviews this site; the presets are read from the labels above and the result is arithmetic. Confirm every draw with your pharmacist.
  • Report a problem

The volume is the decision

Two people can hold the same Zomacton 5 mg vial, add different amounts of the supplied diluent, and both be following the label. One has 5 mg/mL, the other 1 mg/mL, and the same 1 mg dose is the 20 mark for the first and the 100 mark for the second. Neither is wrong, but each has to use the same volume every time and read the mark that goes with it. The calculator shows the concentration your volume produces so you can check it against your instructions before you look at the mark.

Check the official label

Serostim label on DailyMedZomacton label on DailyMedOmnitrope label on DailyMed

Every number this page uses was read from these documents on 2026-09-04. The label is the authority; if it disagrees with this page, the label wins.

What the labels say

Serostim4, 5 and 6 mg vials; reconstitute with 0.5 to 1 mL of the supplied diluent.
Zomacton5 mg vial with 1 to 5 mL; 10 mg vial with 1 mL.
Omnitrope 5.8 mgLabel states 5 mg/mL after reconstitution. The preset uses that figure.
Other brandsPens and self-mixing cartridges deliver their own dose. Not offered.

These labels prescribe in milligrams. A convention of roughly 3 IU per mg is often quoted for growth hormone; this calculator does not apply it. If your prescription is in IU and your vial in mg, the conversion the product's own label uses is the one to ask your pharmacist for.

Where IU trips people up

Drawing "2 IU" to the 2 mark. The 2 mark on a U-100 syringe is 0.02 mL of whatever is in the vial. It has no relationship to 2 IU of growth hormone. Every dose has to go through the concentration: milligrams divided by mg/mL gives millilitres, and millilitres times 100 gives the mark.

The question for your pharmacist, if the numbers on your prescription and your vial are in different units: "My prescription says X IU and my vial says Y mg. How many mL do I add, and how many mL is my dose?" An answer in millilitres is one you can check on the syringe directly, because a U-100 mark is always a hundredth of a millilitre.

Write the volume down

Because the label gives a range, the volume you add is the only number on the page that is yours rather than the manufacturer's. Write it on the vial or the box the day you mix it. When the calculator says a draw is too small to read, adding more diluent within the labelled range makes the same dose a larger, readable volume, and it will show you the volume that works. If the label permits only one volume, a syringe with finer marks is the other way out, and that is a pharmacy question.

Mixing tools

Bacteriostatic water: make the four agree Diluent passport: what your label names Three clocks: which date ends first Syringe lab: can the barrel show it

Worked answers

Any concentration chart 1 mL is how many units?

Other questions

My brand is not listed. Can I still use the calculator?

If it is a pen or a self-mixing cartridge, it delivers its own dose and there is nothing to calculate. If it is a powder vial with a stated strength, tap "My vial is not listed or is compounded", pick powder, and type the vial amount and the liquid volume from your instructions.

It says my draw is too small to measure. What now?

See "write the volume down" above. More diluent, within the range on your label, lowers the concentration and makes the same dose more marks. The calculator names the volume that would work.