Peptide Calculator
Calculate peptide concentration, draw volume, and syringe units from vial size and diluent
This peptide calculator is reconstitution math. It divides the milligrams in a vial by the milliliters of diluent, then converts a microgram amount into milliliters and syringe units. It does not recommend a dose, a brand, or where to obtain a peptide.
Calculator Inputs
Often bacteriostatic water. This page does not choose that volume for you.
Results
Enter values above to see your results
Reconstitution math only. Not medical advice, not a dose recommendation, and not a guide to obtaining peptides.
How to use this calculator
- Enter the peptide amount printed on the vial, in milligrams.
- Enter how many milliliters of diluent are added to that vial.
- Enter the microgram amount you want to measure, and the syringe scale. U-100 is 100 units per milliliter.
How the calculation works
Concentration in mg/mL is vial milligrams ÷ diluent milliliters. Multiply by 1,000 for mcg/mL. Draw volume is the desired micrograms ÷ mcg per milliliter. On a U-100 syringe, units are milliliters × 100. On a U-40 syringe, units are milliliters × 40.
A 5 mg vial mixed with 2 mL has 2.5 mg/mL, which is 2,500 mcg/mL. Measuring 250 mcg takes 0.1 mL, or 10 units on a U-100 syringe.
Milligrams, micrograms, and units
1 mg is 1,000 mcg. Syringe units are not milligrams. A unit on an insulin syringe is a mark on that barrel. A U-100 barrel has 100 units in 1 mL, so each unit is 0.01 mL.
What this page will not do
It does not list peptide sources, compounding instructions beyond the volume math, or schedules for named drugs. A clinician chooses whether a dose is appropriate.
Worked example
5 mg vial, 2 mL diluent, 250 mcg on a U-100 syringe
5 mg ÷ 2 mL= 2.5 mg/mL (2,500 mcg/mL)250 mcg ÷ 2,500 mcg/mL= 0.1 mL0.1 mL × 100= 10 unitsTips & Best Practices
- •Read the vial label in milligrams and convert it before you enter a microgram dose.
- •If the draw is more than 1 mL, check the vial size and the amount you entered.
Frequently Asked Questions
How many units is 250 mcg?
It depends on the concentration. A 5 mg vial in 2 mL is 2,500 mcg/mL, so 250 mcg is 0.1 mL, which is 10 units on a U-100 syringe.
What does U-100 mean?
A U-100 syringe is marked so that 100 units equal 1 mL. A U-40 syringe is marked so that 40 units equal 1 mL. The same volume is a different unit count on each scale.
Is this a dosing guide?
No. It converts a vial mass, a diluent volume, and a microgram amount into milliliters and syringe units. It is not medical advice.
Guides & Articles
Due Date From Ovulation or Conception Date
Add 266 days to an ovulation date or a conception date. A worked example, why both dates use the same rule, and when the period method is the better start.
How Accurate Are Pregnancy Due Dates?
A due date is the 40-week mark from a period, or 38 weeks from ovulation. Most births are not on that exact day. What moves the estimate, and what replaces it.
How Many Days Is a Pregnancy?
280 days (40 weeks) from the last menstrual period, or 266 days (38 weeks) from conception. Same model, different starting point, plus the term labels clinicians use.