How does the math work for a blend?

Every part spreads through the same water. So each draw holds the same share of every part. If a draw is one fortieth of the vial, it holds one fortieth of each part.

Why must I pick which part my dose is for?

Each part has its own amount. So a dose of 250 mcg means a different draw for each part. The page will not guess which one you meant.

Why are the parts called A to D?

The page does not ask for names. That way a shared link holds only numbers, not product or seller names.

Can this calculator tell me what dose to use?

No. It only does math with the numbers you type. Only a licensed clinician should set a dose.

Calculator · U-100 insulin syringes

Peptide blend calculator

Some vials hold two to four peptides mixed together. Type each part's amount from the label and the water added. Then type the units you draw, or the dose of one part, to see every part in that draw.

Updated November 3, 2026, by The Peptide Field Read our standards

This does the math. It does not pick a dose.

Only a licensed clinician should set a dose. Talk with your doctor, nurse, or pharmacist before you use any number from this page. Ask them to work out the numbers on their own.

You use these results at your own risk. The Peptide Field is not liable for any dose measured or taken with them.

How the math works

Every draw holds each part in the same ratio.

All the parts spread through the same water. Here, circles and squares stand for two parts.
A draw takes a slice of that liquid. The slice has the same mix of circles and squares as the vial.
So when a draw holds a share of one part, it holds the same share of every part.

Drawing of one vial with layered powder beside three small empty vials. — Illustration only. It is not to scale. Use the drawing in your result for your numbers.

Before you use these numbers

Have your provider check the math first. Show your doctor, nurse, or pharmacist the vial, its label, and the numbers you typed. Ask them to work it out on their own.
Check that the syringe says U-100. The FDA describes U-100 as 100 units in every mL. U-40 syringes hold 40 units in every mL, so the marks mean something else.
Use the same unit as your instructions. Mixing up mg and mcg gives a dose 1,000 times too big or too small.
Write down how much water went in the vial. You need that number each time you work out a dose.
Using a pen? Pen clicks are not syringe units. Pens come mixed and marked by the maker, so follow the pen label, not this page.
Use a new, sterile needle and syringe for every dose. Never share needles or syringes, and keep each vial for one person. The FDA and CDC both say this.
Took the wrong amount? Call Poison Help: 1-800-222-1222 It is free and open 24 hours a day, every day.

What this calculator cannot do

It cannot tell you what dose to use. Only a licensed clinician should set a dose.
It cannot check that the vial holds the amount printed on its label.
It cannot tell you if a product is safe, legal, or real.
It works only for U-100 insulin syringes. U-40 syringes are marked differently, and the result would be wrong.
It never turns IU into mg or mcg. That depends on the substance, so only the label can tell you.

Common questions

How does the math work for a blend?: Every part spreads through the same water. So each draw holds the same share of every part. If a draw is one fortieth of the vial, it holds one fortieth of each part.
Why must I pick which part my dose is for?: Each part has its own amount. So a dose of 250 mcg means a different draw for each part. The page will not guess which one you meant.
Why are the parts called A to D?: The page does not ask for names. That way a shared link holds only numbers, not product or seller names.
Can this calculator tell me what dose to use?: No. It only does math with the numbers you type. Only a licensed clinician should set a dose.

Sources

The calculator uses one fixed fact: on a U-100 syringe, 100 units fill 1 mL. The rest is division with the numbers you type. It names no sellers and suggests no doses.

The needle, 28-day, and Poison Help lines come from the FDA, CDC, USP, and Poison Help pages listed here.

510(k) clearance K233794: Insulin Syringe (U-40 and U-100), March 6, 2024U.S. Food and Drug Administration · Checked November 2, 2026
Quoted: “U-100 means there are 100 units of insulin in every mL”
FDA's Concerns with Unapproved GLP-1 Drugs Used for Weight LossU.S. Food and Drug Administration · Checked November 3, 2026
Quoted: “Always use a new, sterile needle and syringe for each dose.”
Preventing Unsafe Injection Practices, March 26, 2024Centers for Disease Control and Prevention · Checked November 3, 2026
Quoted: “Never reuse a needle or syringe on more than one patient.”
Quoted: “Limit the use of multi-dose vials and dedicate them to a single patient whenever possible.”
Quoted: “the vial should be dated and discarded within 28 days unless the manufacturer states another date for that opened vial”
USP General Chapter 797 FAQs, December 11, 2023United States Pharmacopeia · Checked November 3, 2026
Quoted: “a conventionally manufactured multiple-dose vial may not be used after 28 days of first puncture”
Calling Poison HelpHealth Resources and Services Administration · Checked November 3, 2026
Quoted: “The toll-free Poison Help line is 1-800-222-1222.”
Quoted: “This number provides free and confidential help 24 hours a day, 7 days a week, 365 days a year.”