Peptide Calculator: Accurate Reconstitution & Dosage Calculations

This peptide calculator converts mg to mL and insulin units (IU) to help you accurately calculate peptide dosage, reconstitution, and injection volume.

Quick Start Instructions

  • Pick Find Units or Find Dose.
  • Enter vial size and water volume.
  • Enter your dose, or use Weight-Based Dose if needed.
  • Choose syringe size.
  • Add schedule and supply details for cycle planning and reorder timing.
  • Export, print, or share your results.
Peptide Calculator
Shared calculation loaded.
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Reorder date = projected depletion minus this buffer.
Calendar Export
Share Results

This calculator is provided for informational and research-use reference only. It does not constitute medical advice and is not a prescription tool. Users are responsible for independently verifying all calculations, protocol details, and product information before use.

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Peptide Calculator Summary — Project Biohacking

For research-use reference only. This is not medical advice.

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How to Use the Project Biohacking Peptide Calculator

This peptide calculator helps you estimate syringe units, calculate peptide dose, plan a dosing schedule, track total cycle supply, and project when you may need to reorder. The current version includes two calculation modes, optional weight-based dosing, dynamic syringe scaling, schedule planning, calendar export, sharing, print/save tools, advanced calculation details, and a research-use disclaimer.



Choose your calculation mode

Start by selecting one of the two calculator modes at the top of the tool. The current calculator includes Find Units and Find Dose as the primary mode options.

  • Find Units tells you how many syringe units to draw when you already know the target dose in mcg.
  • Find Dose estimates the dose in mcg when you already know how many syringe units you plan to draw.

Use Find Units when dose is your starting point. Use Find Dose when syringe units are your starting point.


Enter vial and reconstitution details

Next, enter the two values used to establish concentration:

  • Vial Size (mg)
  • Water Volume (ml)

The current calculator provides preset buttons for vial size of 5 mg, 10 mg, 15 mg, and 20 mg, plus a custom mg input. It also provides preset buttons for water volume of 1 ml, 2 ml, and 3 ml, plus a custom ml input.

If your vial or water volume does not match a preset, use the custom field. These values are used together to calculate concentration before the final dose or unit output is shown.


Use weight-based dosing when needed

If your protocol is based on body weight, turn on Weight-Based Dose. The current calculator then reveals fields for Body Weight (kg) and Dose (mcg/kg) and displays a computed dose box that automatically calculates the total dose from those values.

Use this feature only when dosing is intended to be calculated by body weight. If you are using a fixed dose instead, leave this option off and enter your target dose directly in the standard dose field.


Enter dose or syringe units

The next input depends on the mode you selected:

  • In Find Units, enter the Desired Dose (mcg).
  • In Find Dose, enter the syringe units to estimate the resulting dose.

The calculator supports preset dose buttons and custom numeric entry for dose-related inputs. Once the required inputs are entered, the calculator displays the estimated result in the active mode.


Select the syringe size

Choose the syringe size that matches your actual syringe. The current calculator supports:

  • 0.3 ml (30U)
  • 0.5 ml (50U)
  • 1 ml (100U)

This selection changes the scale used by the visual syringe display. The current implementation notes also confirm dynamic syringe markings, capacity labels, and responsive fill percentages based on syringe size and calculated units.


Read the syringe visualization

The syringe visualization is included to help users understand the estimated pull amount on a unit scale. The current build shows graduated markings and a fill level that adjusts according to the selected syringe size and the calculated number of units.

Use this as a visual reference, but rely on the numeric result as the primary calculation output.


Build a dosing schedule

Open the Dosing Schedule section to create a schedule for repeated dosing. The current calculator keeps collapsible sections closed by default and allows users to expand them as needed.

Inside the scheduling section, you can enter:

  • Dosing Frequency
  • Start Date
  • Time of Day
  • Cycle End Date (Optional)
  • Manual End Date (Optional)

These settings are used for timeline planning, calendar event generation, and supply projections.


Choose a frequency option

The current build includes multiple schedule presets:

  • Once Daily
  • Once Daily (5 days/week)
  • Twice Daily
  • Twice Daily (5 days/week)
  • Every Other Day
  • 3x Weekly (Mon/Wed/Fri)
  • 2x Weekly (Mon/Thu)
  • Once Weekly
  • Once Daily (10 days)
  • Once Daily (20 days)
  • Custom

Choose the preset that most closely matches your protocol. The implementation notes also state that the occurrence engine supports all 11 frequency modes, twice-daily support, cycle and manual hard stops, and a capped scheduling range.


Use the custom schedule option

If your protocol does not fit one of the preset frequency options, choose Custom. The current implementation notes say the custom schedule section supports Doses per Week and Days Between Doses, with bidirectional calculation so one value updates the other automatically.

Use this option when you need more flexible control over dosing frequency.


Track cycle supply

Open the Cycle Supply section to estimate how long your supply may last. The current calculator includes:

  • Vials Purchased to Start Cycle
  • Amount Per Vial
  • Total Inventory
  • Reorder Buffer (Days)

This section uses the number of starting vials, the selected vial size, the current dose, and the schedule inputs to estimate total available inventory and supply duration.


Enter vials purchased

Use the vials purchased control to enter how many vials you started with. The current UI includes decrease and increase controls plus a numeric input for the starting vial count.

This value matters because the tool uses it to estimate total inventory and project when supply may be depleted.


Set the reorder buffer

Enter the number of days of lead time you want before running out. The current on-page explanation says the reorder date is calculated as the projected depletion date minus the reorder buffer, allowing time for shipping before supply is exhausted.

If you want a one-week safety margin, use a reorder buffer of 7 days. If you want more time, increase the buffer.


Review the cycle timeline

Open Cycle Timeline to review projected supply timing. The current tool text explains that users should enter vial size, water volume, dose, and a dosing schedule to project supply timeline and reorder date.

This section is designed to help you understand:

  • The projected depletion point based on your current setup.
  • The recommended reorder timing based on your selected buffer.
  • Whether the planned cycle end or manual end stops the schedule before inventory runs out.

The implementation notes also state that schedule generation stops at the earliest effective end condition and uses a bounded occurrence engine.


Export the schedule to your calendar

Use the Calendar Export section after entering valid schedule details. The current interface includes:

  • Download Calendar File
  • Add Calendar Reminder

These buttons remain disabled until enough valid schedule, dose, and vial details are entered. The implementation notes state that the export creates an ICS file with event entries, unique IDs, timestamps, reminders, disclaimer text in the description, and an event range that stops at the effective end date.

Use Download Calendar File if you want to save and import the schedule manually. Use Add Calendar Reminder when you want the calendar export flow for reminder use.


Print or save a summary

Use Print / Save Summary to create a print-friendly version of the current calculation. The current interface also tells users to use the browser’s Save as PDF option if they want to save a copy.

The implementation notes say the print view hides interactive elements and shows a print-only summary table. This makes it useful for saving a clean reference version of the current setup.


Share results

Use the Share Results section to send or save a completed setup. The current share section says it supports email, message, or social sharing and prompts users to complete a calculation before sharing results.

The implementation notes say the share tools include:

  • Native share API with clipboard fallback
  • Email share
  • Copy Summary
  • Copy Link with encoded calculator state
  • Post to X
  • Facebook share

These features are intended to let you share either the summary itself or a saved configuration link.


Open shared calculation links

The calculator can restore state from shared links. The current build includes a Shared calculation loaded. banner, and the implementation notes say the tool restores saved state from URL parameters during initialization.

This allows a user to open a shared link and load the same saved calculator setup, schedule values, and related inputs.


Use advanced options

Open Advanced Options for additional calculation details. The current visible advanced fields include:

  • Concentration in mg/ml
  • Units per Unit
  • Cycle Days for total mg estimate

Use this section if you want extra technical detail behind the output or need a cycle-length estimate tied to total usage.


Understand validation and alerts

The current implementation notes say the calculator includes validation features such as:

  • Real-time required-field validation
  • Red error messages
  • Warning icons
  • Red borders on invalid fields
  • “Required - must be positive” style messages

If a result is missing, a share or calendar button is disabled, or a section does not update as expected, review the required inputs for missing or invalid values first.


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Common Reconstitution Volumes

While almost any volume of bacteriostatic water can be used, a few standard reconstitution amounts make peptide dosing more consistent and easier to measure.


2 mL (Most Common)

  • A balanced option that works well for most peptides. It keeps concentrations manageable while maintaining reasonable injection volumes and is commonly used with standard 5 mg vials.

1 mL (Higher Concentration)

  • Produces a stronger solution with smaller injection volumes. This approach can improve efficiency but may make precise dosing slightly more difficult, especially for beginners.

3 mL (Lower Concentration)

  • Creates a more diluted solution, making small dose adjustments easier and more precise. However, it results in larger injection volumes.


For most people working with a standard 5 mg peptide vial, starting with 2 mL of bacteriostatic water provides a practical balance between concentration and dosing accuracy.


Want a full walkthrough of how to reconstitute peptides safely?

Read the complete guide: Peptide Reconstitution Guide

Peptide-Specific Dosing Guidelines

These are general reference ranges provided for calculator context. Detailed protocols vary and should be evaluated separately.

Worked Dosing Examples

These show how the calculator handles the situations people ask about most.

Stacking two peptides in one injection. When you combine compounds such as CJC-1295 and Ipamorelin, calculate each peptide separately, then draw them into the same syringe one after the other while tracking the total volume. Run each peptide through the calculator on its own before combining.

Weight-based dosing. Some protocols specify a dose per kilogram of body weight. A 200 lb person is about 91 kg, so at 5 mcg/kg the target dose is roughly 455 mcg. Turn on Weight-Based Dose in the calculator above and it converts that to syringe units for you.

Estimating how long a vial lasts. At 250 mcg twice daily from a 5 mg vial (5,000 mcg), you use 500 mcg per day, which is 10 days per vial. The Cycle Supply section projects this automatically and flags your reorder date.


BPC-157 Dosage Guidelines

BPC-157, also known as Body Protection Compound, is typically used in the following ranges:

  • Typical dose: 250–500 mcg
  • Frequency: 1–2 times daily
  • Standard vial: 5 mg


TB-500 Dosage Guidelines

TB-500, a synthetic form of Thymosin Beta-4, is commonly used as follows:

  • Typical dose: 2–2.5 mg
  • Frequency: 2–3 times per week
  • Standard vial: 5 mg or 10 mg

Both BPC-157 and TB-500 are research-use recovery peptides, so where you source them matters as much as the dosing math. We compare third-party testing, COAs, and current discount codes for these compounds in our Limitless Biotech review.


Ipamorelin Dosage Guidelines

Ipamorelin is often used for growth hormone support and recovery:

  • Typical dose: 150–300 mcg
  • Frequency: 2–3 times daily
  • Standard vial: 5 mg


CJC-1295 (No DAC) Dosage Guidelines

CJC-1295 (No DAC) is typically paired with GHRPs and used in shorter cycles:

Typical dose: 100–200 mcg

  • Frequency: 1–5 times a week
  • Standard vial: 2 mg or 5 mg

Note: These are general reference ranges. Individual protocols vary based on goals, body weight, and response.

Avoiding Common Peptide Dosing Mistakes

Peptides typically cost $50 to $200 per vial, so a single dosing error either wastes expensive compound or throws off your results for an entire cycle. Most mistakes come from the math, not the peptide. These are the errors the calculator is built to prevent, and the ones to watch for when you check your inputs.



Confusing milligrams with micrograms. There are 1,000 micrograms in 1 milligram. Enter a dose in milligrams when you meant micrograms and you will be off by a factor of 1,000. Confirm which unit each field expects before you draw.

Mismatching your syringe size. A 0.5 ml syringe holds 50 units, not 100. Apply a calculation built for a 1 ml (100 unit) syringe to a smaller one and the volume you draw will be wrong. Select the syringe size that matches the one in your hand.

Letting rounding errors stack up. If the result says draw 8.7 units and you round to 9 every time, you take about 3% more peptide per dose. Over weeks that changes both your results and how long the vial lasts. Use the number the calculator gives you.

Reconstituting with too little water. A higher concentration means a smaller injection volume, but it also makes precise dosing harder. For most 5 mg vials, 2 ml of bacteriostatic water is the practical balance between concentration and accuracy.

Skipping refrigeration. This is not a math error, but it has the same effect. A reconstituted peptide left unrefrigerated degrades quickly, so a correctly measured dose can still deliver less active compound than you calculated. Bacteriostatic water extends stability; refrigeration keeps it.

The Science Behind Peptide Dosing

Peptide dosing follows pharmacokinetic principles. Each compound has a half-life that determines how long it stays active, so shorter half-life peptides are typically dosed more frequently to hold a steady level.



Receptor saturation also matters. Once the target receptors are fully occupied, additional peptide adds no further effect, which is why precision matters more than volume and why more is not always better.


Individual response varies. Age, body composition, metabolic rate, and other compounds all influence how a given dose behaves. The calculator keeps your dose consistent so you can identify your own optimal amount through careful adjustment rather than guesswork.

Route of administration affects how much compound reaches circulation. Subcutaneous injection, the most common method, generally falls in the range of 80 to 95% bioavailability depending on the peptide. The calculator works from the dose you draw; your individual response determines the rest.

Peptide Preparation, Reconstitution, and Storage Basics

Calculator accuracy depends on proper preparation. How you reconstitute, dilute, and store a peptide sets its concentration, which is what every dose calculation relies on.

For step-by-step guidance, see:


Key Terms for Peptide Calculations

Peptide calculations typically involve converting between milligrams (mg), milliliters (mL), and insulin units (IU). Understanding how these units relate is essential for accurate dosing.


Peptide Strength (mg)
The total amount of peptide in the vial before reconstitution.

Bacteriostatic Water (mL)
The volume of liquid added to dissolve the peptide.

Concentration (mg/mL)
The resulting strength after reconstitution.

Insulin Units (IU)
The measurement used on insulin syringes. This calculator converts your dose into units for accurate measurement. For a deeper breakdown of concentration and dilution, see the Peptide Reconstitution Guide.


Calculating Peptide Doses for Pets


Peptide dosing for pets follows the same concentration principles as human dosing, but requires greater precision due to smaller body weights and tighter dosing ranges.



Most veterinary peptide use is calculated based on weight, which makes accurate reconstitution and unit conversion even more important. Small variations in measurement can have a larger relative impact compared to standard dosing scenarios..


This peptide calculator can be used for pets by adjusting inputs carefully, but for a dedicated weight-based tool designed specifically for animals, use the Pet Peptide Calculator.

Bookmark this page to keep accurate peptide calculations available whenever you need them.

Peptide Calculator FAQ

  • What does the peptide calculator do?

    The calculator helps estimate either the syringe units needed for a target dose or the dose delivered by a selected number of syringe units. The current version also includes weight-based dosing, schedule planning, cycle supply tracking, reorder projections, calendar export, sharing, and print/save summary tools.


  • What is the difference between Find Units and Find Dose?

    Use Find Units when you already know the dose in mcg and want to calculate how many syringe units to draw. Use Find Dose when you already know the syringe units and want to estimate the resulting dose in mcg.


  • How do I use weight-based dosing?

    Turn on Weight-Based Dose, then enter body weight in kilograms and the target dose in mcg per kg. The calculator will automatically generate a computed total dose from those two values.

  • Can I use custom vial sizes and water volumes?

    Yes. The calculator includes preset buttons for common vial sizes and water volumes, but it also provides custom input fields for both values if your setup does not match a preset option.


  • What syringe sizes does the calculator support?

    The current build supports 0.3 ml, 0.5 ml, and 1 ml syringes, which correspond to 30U, 50U, and 100U scales. The syringe visualization updates dynamically based on the selected syringe size and calculated units.


  • How does the dosing schedule feature work?

    The Dosing Schedule section lets you choose a frequency, start date, and time of day, with optional cycle end and manual end dates. The current calculator supports multiple preset frequencies, including daily, twice daily, every other day, weekly patterns, and a custom option.


  • How does the calculator estimate reorder timing?

    The Cycle Supply and Cycle Timeline sections use your starting vial count, vial size, dose, and dosing schedule to estimate how long supply may last. The reorder date is then projected using the depletion date minus the reorder buffer in days.


  • Can I export my schedule to a calendar?

    Yes. The current interface includes Download Calendar File and Add Calendar Reminder buttons once valid schedule details are entered. The implementation notes say the export generates ICS calendar events with reminders and stops at the effective schedule end date.


  • Can I save or share my calculation?

    Yes. The calculator includes Print / Save Summary for printing or saving as PDF, plus share tools for copying, emailing, or sharing a completed setup. The current implementation notes also say shared links can restore calculator state and display a “Shared calculation loaded” banner.

Important Disclaimer:


This peptide calculator is provided for research and educational purposes only and does not constitute medical advice, diagnosis, or treatment.

Assumption of Risk: Use of this calculator and any actions you take based on its results are at your own risk. We make no warranties regarding accuracy and are not liable for any damages, injuries, or losses arising from use of this tool.

Regulatory Notice: Many peptides are for research use only and may not be FDA-approved for human use. Verify the legal status in your jurisdiction.

Individual results vary. Never disregard professional medical advice or delay seeking it because of information on this website. In case of emergency or adverse reaction, seek immediate medical attention.