PeptideMetrix
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Peptide reconstitution & dosing

Peptide Calculator

Calculate peptide concentration, liquid volume and U-100 syringe equivalents from your own values. Free reconstitution arithmetic with visible formulas and capacity checks.

How it works

Arithmetic only, not a dose recommendation. Confirm every unit and source value independently.

Showing an example, edit any field below to start your own
Search or select a peptide optional

This only labels your calculation with a peptide name, for your own reference. It does not fill in, choose, or suggest any values. Enter your syringe, vial strength, water, and dose yourself below, based on your own supplies.

1. Syringe size U-100 insulin syringe

Confirm the syringe is explicitly U-100, then choose its capacity. Capacity does not determine calibration. U-40, U-500 and generic mL syringes are not supported.

2. Vial strength milligrams (mg)

This is the total amount of peptide (in mg) freeze-dried inside the vial, printed on the label or certificate of analysis.

mg
3. Final solution volume millilitres (mL)

Enter the final solution volume in mL. If you enter water added instead, the calculation assumes it equals the final volume. The tool does not assess solvent suitability or vial capacity.

mL
4. Target dose micrograms (mcg)

Enter an amount in micrograms from your own protocol. The example and preset values are arithmetic examples, not dose recommendations. 1 mg equals 1,000 mcg.

mcg

For the entered amount of 100 mcg, calculated U-100 equivalent:

Unavailableunits

Within the entered vial amount and syringe capacity. This does not confirm safety or measurability.

U-100 only: 100 units = 1 mL. Diagram is illustrative, not a measurement guide. Check actual graduations; fractional results may not be measurable. Display values are rounded.

Show the math
Waiting for calculator to start.
Concentration 0 mcg/mL How much peptide is in every millilitre of your mixed solution.
Volume per dose 0 mL The liquid volume that delivers your target dose.
Syringe capacity 30 units The most your selected syringe can hold in one draw.
Max dose this syringe fits 0 mcg Capacity-based amount only; may exceed the available vial amount. Not a recommended dose.
Doses per vial 0 Theoretical ratio, ignoring losses. Complete portions: 0. No allowance for dead space or stability.
Please read before you rely on any result This takes about fifteen seconds, and it matters. Tap to expand.
  • Informational use only. This calculator is provided for informational and educational purposes only. It is not medical advice and does not replace guidance from a qualified professional.
  • Results reflect your inputs, nothing more. Every number below comes directly from the values you type in. The calculator has no way to know whether those values are correct, it only performs the arithmetic.
  • Verification is on you. You are responsible for confirming your vial strength, water volume, syringe size, and target dose against your own label and protocol before drawing any solution.
  • We're not liable for how it's used. The site and its owners are not responsible for outcomes resulting from incorrect inputs or decisions made using the calculated results.
  • Double-check before you draw. Please review every value on screen once more before using the output for anything.
What is this?
A unit converter built specifically for peptide reconstitution math.
What it calculates
Solution concentration, volume per dose, and the syringe unit to pull to.
Why use it
Shows the calculation and flags capacity limits for you to review.
What you'll need
Your vial's mg strength, water volume, syringe size, and target dose.
How it works

Four numbers in, one answer out.

The calculator only ever needs these four inputs. Here's what each one means and where to find it.

  1. 01

    Pick your syringe

    Confirm the syringe is explicitly U-100, then choose its capacity. Capacity does not determine calibration. U-40, U-500 and generic mL syringes are not supported.

  2. 02

    Enter the vial strength

    This is the total amount of peptide (in mg) freeze-dried inside the vial, printed on the label or certificate of analysis.

  3. 03

    Enter final solution volume

    Enter the final solution volume in mL. If you enter water added instead, the calculation assumes it equals the final volume. The tool does not assess solvent suitability or vial capacity.

  4. 04

    Set your target dose

    Enter an amount in micrograms from your own protocol. The example and preset values are arithmetic examples, not dose recommendations. 1 mg equals 1,000 mcg.

Under the hood U-100 equivalent = (dose mcg ÷ ((vial mg × 1000) ÷ final volume mL)) × 100
Why this calculator

Calculation features and limits.

See how the arithmetic works, how inputs are handled and when to recheck a result.

Transparent arithmetic

Calculations use unrounded intermediate values. Displayed results use up to nine significant digits and may be rounded; syringe measurement accuracy is not guaranteed.

Instant browser calculation

The website sends four numeric inputs to its own PHP endpoint for an arithmetic comparison. Saving a calculation on this device is optional. Peptide labels stay in the browser.

Browser/server comparison

The browser compares the PHP result with its local arithmetic and reports disagreements or connection failures. Agreement does not verify your inputs, protocol or safety.

Built for every screen

From a phone at the lab bench to a widescreen monitor at a desk, the layout adapts without losing precision.

Catches capacity problems early

If a dose won't physically fit your chosen syringe, you'll see a clear warning before you draw anything.

Light & dark interface

A comfortable reading experience at the bench or at a desk, whatever the lighting.

How peptide calculator arithmetic works

Concentration is mass divided by final solution volume. A U-100 unit is a volume marking, not a fixed mass of peptide.

Concentration formula

Concentration (mcg/mL) = vial mass (mg) × 1,000 ÷ final solution volume (mL). This assumes the stated mass is accurate and the solution is homogeneous.

Volume and U-100 conversion

Volume (mL) = entered amount (mcg) ÷ concentration (mcg/mL). U-100 equivalent = volume × 100. This conversion does not apply to other syringe calibrations.

Worked arithmetic example

For an example containing 5 mg in a final volume of 2 mL, concentration is 2,500 mcg/mL. An entered amount of 250 mcg corresponds to 0.1 mL or 10 U-100 units. These numbers illustrate arithmetic only.

What this tool cannot decide

It does not choose a dose, solvent, storage temperature, shelf life or preparation method. Use product-specific instructions and qualified professional guidance. Container capacity, solubility, potency, purity and dead-space losses are not modeled.

Methodology and limitations

PeptideMetrix is an arithmetic utility. The browser and PHP implementations calculate the same mass-to-volume conversion. A matching result establishes agreement between two implementations, not independent clinical validation.

Intermediate values are not intentionally rounded. Display values use up to nine significant digits; very small or large values use scientific notation. Results may fall between syringe graduations. The tool does not round to a recommended syringe mark.

The calculator checks numeric validity, syringe capacity and whether an entered amount exceeds the total vial amount. A warning appears below one U-100 unit. Passing these checks does not establish safe or practical measurement. The theoretical portions-per-vial ratio ignores losses and storage limits.

Examples and preset values are not recommended doses. Selecting a name changes only a label. No medical reviewer or clinical certification is claimed for this release.

Reference sources

Privacy and local storage

This website calculates locally, then sends vial mass, final solution volume, entered amount and syringe capacity to its own API to compare arithmetic. The supplied application code does not write those values to a database or application log. Hosting infrastructure may retain request metadata; the operator must document its actual logging and retention before launch.

Peptide labels stay in your browser. Calculation storage is off by default. If you enable “Remember this calculation,” values and the selected label are saved in browser local storage until cleared. Use “Clear saved calculation” to delete that record. Theme preference is saved separately. Anyone using the same browser profile may access saved values.

The supplied code has no analytics or advertising scripts and no remote font requests. Copy, share and download transfer values only when you choose those actions. The separately packaged Chrome extension calculates offline and does not send inputs to the website.

FAQ

Questions people actually ask

Can't find yours? The explanations above in "Learn" cover the underlying concepts in more depth.