Unit converter
Convert between mcg, mg and g, between mL and units on a U-100 syringe, and between IU and mg using the factor printed on your label.
mcg, mg and g
Enter an amount to convert.
Arithmetic only. This tool does not recommend a dose or a schedule; use the ones your prescriber gave you.
mL and syringe units
Enter a volume in mL or a number of units.
Arithmetic only. This tool does not recommend a dose or a schedule; use the ones your prescriber gave you.
This is for U-100 syringes only. For U-40 syringes see the syringe units chart.
IU and mg
Enter the IU per mg figure printed on your label or package insert.
Arithmetic only. This tool does not recommend a dose or a schedule; use the ones your prescriber gave you.
An IU is a measure of biological activity, and each substance has its own IU per mg figure. This page does not supply one. Take it from the vial label or package insert of the product you have, and if neither states it, ask your pharmacist.
IU are also not the same thing as the units on an insulin syringe. Syringe units are a volume. See the question below.
Questions
How do I convert mcg to mg?
Divide by 1,000. 250 mcg is 0.25 mg, and 1,500 mcg is 1.5 mg. To go from mg to mcg, multiply by 1,000.
How many units is 1 mL?
100 units on a U-100 insulin syringe. One unit is 0.01 mL, so 0.25 mL is 25 units.
Can I convert IU to mg without a label?
Not reliably. The IU per mg figure differs between substances and can differ between products. Use the figure printed for the product in your hand.
Are IU the same as units on an insulin syringe?
No. IU measure the activity of a substance. Units on a syringe measure volume, 0.01 mL each on a U-100 syringe. The two only line up for U-100 insulin, which is made at 100 IU per mL.
Can I convert mg to mL with this page?
No, because mg and mL are linked by the concentration of your vial. Use the reconstitution calculator for that.