Free tool

IU to mg Converter

For HGH, 1 mg is about 3 IU. So 10 IU is about 3.33 mg. But IU measures how strong something is, not how much it weighs. So the number is different for each substance. hCG is about 10,000 IU per mg. Insulin is 26.11. Pick your substance below, or set your own ratio.

IU
=
mg
Substance
IU / mg

3 IU per mg is the common ratio for HGH (somatropin)

Ratios

IU per mg by substance

SubstanceRatio
HGH (somatropin)1 mg = 3 IU
hCG1 mg is about 10,000 IU
Insulin (human)1 mg = 26.11 IU (WHO standard)

These are the commonly used reference ratios. IU is a measure of activity for one specific substance, so never reuse one substance's ratio for another. Always check your own product label.

Quick chart

IU to mg for HGH (3 IU per mg)

International unitsMilligrams (mg)
2 IU0.67 mg
4 IU1.33 mg
5 IU1.67 mg
6 IU2.00 mg
8 IU2.67 mg
10 IU3.33 mg
12 IU4.00 mg
15 IU5.00 mg
20 IU6.67 mg
30 IU10.00 mg

This chart uses the common HGH ratio. Always check the label on your own product, because the ratio can be different.

Working out a peptide dose?

Once you have your mg, the free peptide dosage calculator turns it into the exact units to draw on your syringe.

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Questions

Frequently asked

How many mg is 10 IU of HGH?

For HGH the common ratio is 1 mg = 3 IU. So 10 IU is about 3.33 mg.

How do you convert IU to mg?

You divide the IU by the IU-per-mg ratio for that substance. For HGH the ratio is 3, so 6 IU is 2 mg.

How many mg is 5000 IU of hCG?

For hCG the common ratio is about 10,000 IU per mg. So 5000 IU is about 0.5 mg. Always check your own product label.

Is IU the same for every substance?

No. IU measures activity, not weight. Each substance has its own ratio, so one number does not work for everything. The HGH number must not be used for hCG.

How many IU is 1 mg of insulin?

For human insulin the WHO standard is 26.11 IU per mg. So 1 mg is about 26.11 IU.

Why is IU used instead of mg?

IU measures how much a substance does, not how much it weighs. It is used when weight alone does not describe the strength.