How do I calculate peptide dosage in units?

Units to draw = Desired dose (mcg) ÷ Concentration (mcg per unit). For example, if you want 250mcg and your concentration is 25mcg/unit, draw 10 units.

What is the standard insulin syringe size for peptides?

Most peptide users use a 100-unit (1ml) insulin syringe with 29-31 gauge needles. The smaller markings make accurate dosing easier.

How accurate are insulin syringe measurements?

Insulin syringes are highly accurate, typically within ±5% of the marked volume. For best results, draw slightly past your target and push back to remove air bubbles.

Peptide Dosage Calculator

For educational purposes only. Not medical advice. Full disclaimer

Mark Simmons, B.S. Pharmaceutical Sciences Updated January 2025

Calculate how many units to draw on your insulin syringe for your desired dose.

Quick Start Guide

Know Your Dose

How many mcg do you want to take? (Check your protocol)

Know Your Concentration

Use the reconstitution calculator first

Draw the Units

The result tells you exactly what to draw

1 Desired Dose (mcg)

How many micrograms you want to take per injection

2 Concentration (mcg/ml)

Get this from the reconstitution calculator

Your Results

Draw This Many Units

—

units on insulin syringe

This is how far to fill your syringe

Volume

—

Same measurement in milliliters

Need to know your concentration first?

Use the Reconstitution Calculator to find your concentration based on how you mixed your peptide.

How to Use This Calculator

Enter your desired dose – This is how many micrograms (mcg) of peptide you want to take.
Enter your concentration – This is your solution strength in mcg per ml. Get this from the reconstitution calculator or your mixing notes.
Draw the units shown – The result tells you how many units to draw on a 100-unit insulin syringe.

The Formula

Units to draw = (Desired dose ÷ Concentration) × 100

This formula works because a U-100 insulin syringe has 100 units per ml. So if you need 0.1ml of solution, you draw 10 units.

Quick Reference Examples

Desired Dose	Concentration	Units to Draw
250 mcg	2,500 mcg/ml	10 units
500 mcg	2,500 mcg/ml	20 units
250 mcg	5,000 mcg/ml	5 units
1,000 mcg	2,000 mcg/ml	50 units

Frequently Asked Questions

Small volumes are difficult to measure accurately. Consider using more bacteriostatic water when reconstituting to create a lower concentration. This will result in a larger, easier-to-measure volume for the same dose.

This calculator assumes a U-100 insulin syringe (100 units = 1ml). If you're using a different syringe, use the ml result instead and convert to your syringe's markings.

Round to the nearest whole number or half-unit marking on your syringe. Small variations in volume are generally acceptable. If precision is critical, adjust your reconstitution ratio to create easier-to-measure doses.

Done Calculating? Track Your Daily Doses

Set up your protocol once, then come back daily to log injections, monitor vial usage, and stay on schedule.

Open Daily Dose Tracker

Reconstitution Calculator Next: Dilution Calculator