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Split Dose Calculator

A total divided by the number of administrations gives what each one comes to. Adding a vial strength and a water volume also reads each administration on a syringe.

Last reviewed: September 21, 2026

A total divided by the number of administrations gives what each one comes to.

Optional. Fill this and the water volume to also read each administration on a syringe.

How the arithmetic works

  • Each administration (mg) = total (mg) ÷ number of administrations

The number of administrations is a whole number you choose — this page reports what that split comes to, not whether or how many to use. When a vial strength and water volume are also entered, each administration is additionally read on a U-100 syringe.

Worked example

A 5 mg total, split across 2 administrations, with a 10 mg vial reconstituted in 2 mL of water:

Each administration5 mg ÷ 2 = 2.5 mg (2500 mcg)
Administrations2, totalling 5 mg
Each administration reads5 mg/mL concentration — 50 units

Enter the same numbers into the calculator above and it returns the same figures.

What changes the answer

  • Number of administrations. More administrations means each one is a smaller fraction of the total; fewer means each is larger.
  • The total itself. A larger total split the same number of ways gives a proportionally larger figure per administration.
  • Vial strength and water volume. Optional, and only change what each administration reads on a syringe — not the mg amount each one carries.

FAQ

How do I split a 5 mg dose into two injections?
Divide the total by the number of administrations: 5 mg ÷ 2 = 2.5 mg each. If a vial strength and water volume are also entered, each administration is additionally shown as a syringe reading — at a 10 mg vial in 2 mL of water (5 mg/mL), 2.5 mg reads as 50 units.
split dose calculator peptide
This page's calculator takes a total amount in mg and a number of administrations, and returns what each one comes to — in mg, mcg, and, if a vial strength and water volume are entered, syringe units.
How much is half of 5 mg?
2.5 mg. Splitting a total into two equal administrations is division by 2; splitting into three is division by 3, and so on for any whole number of administrations.
Can I split a dose into a non-whole number of administrations?
No — the number of administrations has to be a whole number (1, 2, 3, and so on). A fractional count of injections isn't a physical quantity this arithmetic can divide into.

To find how many doses a vial holds and how long it lasts at a given frequency, see the vial longevity calculator. For a specific compound’s own reconstitution arithmetic, see the general peptide dosage calculator.