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mg, mcg and grams both ways, and the mark on a U-100 syringe once you enter your vial. Dosing in IU? Pick IU and it stays in IU from the label to the syringe — HGH and hCG vials are measured and dosed that way, so no mass conversion is applied at any point.
HGH and hCG vials are labelled in IU, never mg — so this stays in IU end to end. No mass conversion is applied or needed.
hCG is sold in IU — commonly 2,000, 5,000 or 10,000 IU a vial — and dosed in IU, usually a few hundred at a time. Reconstitute, enter the vial's IU and the water you added, and you get the syringe mark. A 5,000 IU vial in 1 mL is 5,000 IU/mL, so a 250 IU dose is 0.05 mL, the 5-unit mark. No mg figure is involved at any point.
IU. Somatropin is labelled and sold by international units — a vial says 10 IU or 100 IU, not milligrams — and it is dosed in IU too. Pick IU above and this calculator stays in IU from your vial to the mark on the syringe, with no mass conversion anywhere in the chain.
Divide the vial's IU by the millilitres of water you added to get IU per mL, then divide your dose by that for the volume, and multiply by 100. A 100 IU vial in 1 mL is 100 IU/mL, so 2 IU is 0.02 mL — the 2-unit mark. The calculator does it; enter the label, not a converted figure.
Almost never, and you should not need to. IU measures biological activity, not mass, and the factor differs for every compound — there is no universal number. Somatropin has a conventional 3 IU per mg, shown above only as a cross-reference. For anything else, IU stays IU.
One thousand. A milligram is 1,000 micrograms and a gram is 1,000 milligrams. Most peptide doses are written in mcg while vials are labelled in mg, which is where factor-of-1000 errors come from.
You cannot without a concentration, because units are volume rather than mass. Divide your dose by the vial's mg per mL for millilitres, then multiply by 100 — a U-100 syringe holds 100 units in 1 mL.
Yes, and deliberately. An IU vial can only be dosed in IU, the two menus are locked to one family, and a conversion it cannot make is never quietly treated as zero. That last rule exists because the opposite once told someone with a fridge full of HGH that he was out of stock.
This does arithmetic on the numbers you enter. It does not recommend a dose. Dosing decisions belong with you and your prescriber.