Precision calculators

Three calculators, one goal

Getting a peptide dose right means a little math. These three tools do it for you, show the answer on a real syringe, and pick the smallest syringe so the numbers are easy to read. New to this? The full explanation is just below.

Calculator 1 · Reconstitution

Reconstitution calculator

Enter your vial, water and dose. The syringe fills from the needle side to the exact mark.

Calculator 2 · Water planner

Bacteriostatic water planner

Plan it in reverse: choose the round number of units you want to draw, and we tell you how much water to add.

Calculator 3 · Converter

Dose & concentration converter

Already reconstituted? Convert any value between mcg, mg, mL and insulin units.

In depth

How the three calculators work

No prior knowledge needed. Here is exactly what each tool does, the math behind it, and when to reach for it.

1

Reconstitution calculator

Powder + water → how much to draw

Peptides ship as a freeze-dried powder. Before use you reconstitute it: dissolve the powder in bacteriostatic water (sterile water with a touch of benzyl alcohol that stops bacteria growing, so the mixed vial keeps for weeks). Once it is liquid, you need to know how much to pull into the syringe for your dose. That is what this calculator answers.

The math

Concentration = peptide amount ÷ water
Draw volume = your dose ÷ concentration
Units = draw volume × 100  (on a U-100 syringe, 1 mL = 100 units)
Doses per vial = total peptide ÷ your dose

Worked example

A 5 mg vial with 2 mL water is 2.5 mg/mL (2,500 mcg/mL). For a 250 mcg dose: 250 ÷ 2,500 = 0.1 mL = 10 units. The 5 mg vial holds 20 of those doses.

Newcomer tips

Leave the syringe on Auto and it picks the smallest syringe that fits, so a small dose spreads across the barrel and the numbers stay big and readable. You can also drag the plunger to feel the dose, and tap the Easier hint to snap to a round unit mark.

2

Bacteriostatic water planner

Pick clean units → how much water

This is the reconstitution calculator run backwards. Instead of asking “how many units is my dose?”, you decide up front that you want your dose to be a clean number like 10 or 20 units, and the planner tells you exactly how much water to add to make that true. Round units are far easier to measure accurately than something like 7.3 units, so this is the friendliest place for a beginner to start.

The math

Water to add = (target units × vial amount) ÷ (dose × 100)

Worked example

You have a 5 mg vial, your dose is 250 mcg, and you want it to read 10 units. Water = (10 × 5,000) ÷ (250 × 100) = 2 mL. Add 2 mL and every dose is a tidy 10 units.

When to use it

Reach for this before you add any water, to set the vial up so every future draw lands on an easy mark.

3

Dose & concentration converter

Any unit → every other unit

Once a vial is mixed at a known strength, this is your quick translator. Enter the concentration once, then type any value in mcg, mg, mL or syringe units and it instantly shows all of the others. Handy for double-checking a number or converting a protocol written in milligrams into the units you actually dial on the syringe.

The relationships

1 mg = 1,000 mcg
1 mL = 100 units  (U-100 syringe), so 1 unit = 0.01 mL
mL = dose (mcg) ÷ concentration (mcg/mL)

Worked example

At 2.5 mg/mL, a 250 mcg dose is 0.1 mL, which is 10 units. Flip it the other way: 20 units at that strength is 0.2 mL = 500 mcg.

When to use it

Any time you already know your concentration and just need a fast, exact conversion in either direction.

Educational tool only, not medical advice. These calculators do arithmetic to help you understand a dose. They do not tell you whether a peptide is right for you. Double-check every number and consult a qualified healthcare professional before injecting anything.