Peptide Calculator
Turn the concentration on your pharmacy label into a syringe mark. Enter the numbers from your label and the amount your prescriber gave you.
Convert your label to syringe units
Enter the numbers from your pharmacy label and the amount your prescriber gave you.
Enter your values and press Calculate.
For information only, not medical advice or a diagnosis. Only a licensed provider can determine whether treatment is appropriate for you.
For general information only. This calculator converts numbers you enter. It does not recommend an amount, a schedule or a product, and it is not a substitute for professional medical advice. Use it only with a product your licensed pharmacy dispensed to you under your prescription, and follow your prescriber's and pharmacy's instructions. Products measured with this calculator may be compounded medications, which are not FDA-approved and have not been evaluated by the FDA for safety, efficacy or quality.
Convert mcg or mg to syringe units
The table shows the arithmetic for a few concentrations and amounts. It is an illustration of the formula, not a list of amounts to use. Your prescriber and pharmacy label decide yours.
| Label concentration | 100 mcg | 250 mcg | 500 mcg | 1,000 mcg |
|---|---|---|---|---|
| 2.5 mg/mL | 4 units | 10 units | 20 units | 40 units |
| 5 mg/mL | 2 units | 5 units | 10 units | 20 units |
| 10 mg/mL | 1 unit | 2.5 units | 5 units | 10 units |
Worked examples
Label shows a concentration. Your label says 5 mg/mL and your prescriber gave you 250 mcg. Convert 250 mcg to 0.25 mg. Then 0.25 mg / 5 mg/mL = 0.05 mL, and 0.05 mL x 100 = 5 units on a U-100 syringe.
Label shows a total amount and total volume. Your label says 10 mg in 2 mL. First, 10 mg / 2 mL = 5 mg/mL. From there the steps are the same as above, so the same 250 mcg lands on 5 units.
How to read your pharmacy label
Look for the strength or concentration, usually written as mg per mL. If the label lists a total amount and a total volume instead, choose that option in the calculator. If the label uses a different unit, such as IU, ask your pharmacy for the conversion, because it differs by compound.
How the calculator works
It is one division and one conversion. The tool shows each step so you can check it by hand.
volume to draw (mL) = amount to draw (mg) / concentration (mg/mL)
syringe units = volume to draw (mL) x 100 (U-100 syringe)
Common questions
Does this tell me how much to take?
No. It only converts the numbers you type in. Your prescriber decides the amount, and your pharmacy label and instructions tell you how to use the product.
Where do I find the concentration?
It is printed on your pharmacy label, usually as mg per mL. If the label shows a total amount and a total volume instead, choose that option and the calculator divides them for you.
Why does the same amount land on a different mark with a different concentration?
A stronger concentration holds more medicine in each mL, so the same amount takes up less volume on the syringe. A weaker one takes more.
What if my label uses IU instead of mg?
The conversion from IU to mg depends on the compound and comes from your pharmacy. This calculator does not convert IU.
What are units on an insulin syringe?
On a standard U-100 syringe, 100 units equal 1 mL, so 10 units equal 0.1 mL.
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