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Peptide calculator vial-to-syringe math

Syringe, empty 020406080100 UNITS · U-100 · 1 mL

Fill in the three and it fills.

Draw to — units

Fill in what's on the vial, the water and your amount.

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Your syringe

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100 units = 1 mL on an insulin syringe. Getting this math wrong is the most common way people end up with ten times what they meant. Whether an amount is right for you is a question for a clinician, not a calculator.

One vial at a time: whether two compounds can share a syringe is a stability question with almost no published data.

Holding a vial? Check its lab report →

Sends the slip (the answer, the syringe and what you typed) with a link that opens this exact math.

2.6 × 1.2 in, two to a sheet, true size when printed at 100%. Your label text stays on this device.

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The math, by hand

Six worked examples. Arithmetic only: the numbers come from the same math the calculator runs, and none of them is an amount to take.

How many units is 250 mcg from a 5 mg / 2 mL vial?

10 units on a U-100 insulin syringe, which is 0.1 mL. 5 mg in 2 mL is 2.5 mg/mL (2500 mcg/mL); 250 mcg ÷ 2500 mcg/mL = 0.1 mL, and 100 units make 1 mL.

What concentration is a 10 mg vial mixed with 2 mL of water?

5 mg/mL, or 5000 mcg/mL: the amount on the vial divided by the water (10 mg ÷ 2 mL). At that strength, 500 mcg is 0.1 mL, or 10 units on a U-100 syringe.

How many 250 mcg draws are in a 5 mg vial?

20. 5 mg is 5000 mcg, and 5000 ÷ 250 = 20. The water you add changes how many units each draw is, not how many draws the vial holds.

My math says 12.5 units. What do I draw on a 100-unit syringe?

Example: 250 mcg from a 5 mg vial with 2.5 mL of water is 12.5 units. A 100-unit (1 mL) syringe is printed every 2 units, so the nearest point you can read is 13 units, which holds 260 mcg. On a 50-unit or 30-unit syringe, printed every unit, 12.5 units can be read as it is: halfway between two lines.

How many units is 250 mcg on a U-40 syringe, from a 5 mg / 2 mL vial?

4 units. A U-40 syringe holds 40 units per mL, so the same 0.1 mL that reads 10 units on a U-100 syringe reads 4 units on it. Using U-100 math on a U-40 syringe gives a number 2.5 times too high.

How many units is 0.5 mg from a pen labelled 2.5 mg/mL?

20 units, which is 0.2 mL. At 1 unit per click that is 20 clicks, and a 3 mL pen holds 15 doses of 0.5 mg. This is for pens with the concentration printed on the label; fixed-dose pens need no math.

Math v1.0