Peptide Calculator
Calculate reconstitution concentration, mL, and U-100 syringe markings with this free educational tool. No sign-up required.
What is the total volume of your syringe?
Select Peptide Vial Quantity
How much bacteriostatic water are you adding?
How much of the Peptide do you want in each dose?
To have a dose of 50 mcg pull the syringe to 0.33
What is a peptide calculator?
A peptide calculator is a math tool that converts vial quantity, added liquid volume, and a selected calculation amount into concentration and volume results. It helps people understand the relationship between milligrams, micrograms, milliliters, and U-100 syringe unit markings without offering medical directions.
PeptideCalculator.website is designed as an educational reference. It does not sell peptides, recommend use, describe treatment plans, or claim health outcomes.
How to use the peptide calculator
Select a 0.3 mL, 0.5 mL, or 1 mL U-100 syringe. Enter the total peptide mass in the vial in mg, the water volume in mL, and the amount you want to calculate in mcg. Use Custom when a preset does not match your numbers. Read the calculated unit marking and the illustrated syringe fill.
The calculator converts the vial amount from mg to mcg, divides that amount by the water added, then divides the selected amount by the concentration. The resulting mL value is converted to U-100 units by multiplying by 100.
These calculations are useful for learning arithmetic after reconstitution, but they do not establish whether a product, amount, route, or schedule is appropriate.
Peptide calculator formula: mcg to U-100 units
Concentration in mcg/mL = vial amount in mg x 1,000 / volume in mL. Calculated volume in mL = selected amount in mcg / concentration in mcg/mL. U-100 syringe units = calculated volume in mL x 100.
Combining the steps gives: U-100 units = selected mcg x volume in mL / (vial mg x 10). The calculator assumes the entered water volume represents the final solution volume and the material is evenly distributed. If the actual final volume differs, this assumption changes the result.
Worked example: 5 mg in 2 mL
For a hypothetical 5 mg vial and 2 mL volume, first convert 5 mg to 5,000 mcg. Divide by 2 mL to obtain 2,500 mcg/mL. A selected amount of 250 mcg corresponds to 250 / 2,500 = 0.1 mL, or 10 U-100 units.
With the same 5 mg in 1 mL instead, concentration would be 5,000 mcg/mL and the same 250 mcg would correspond to 0.05 mL, or 5 units. These numbers illustrate arithmetic, not a recommended amount or preparation.
Why syringe size and small results matter
A 0.3 mL U-100 syringe holds 30 units, a 0.5 mL syringe holds 50 units, and a 1 mL syringe holds 100 units. Changing syringe capacity changes the fill illustration and capacity warning; it does not change the calculated volume or concentration.
A result such as 0.33 units is a mathematical value, not confirmation that a physical syringe can measure it. Graduation spacing varies. Do not round an unmeasurable result into a dosing instruction; have a pharmacist check the measurement and equipment.
Understanding mg, mcg, mL and units
Milligrams and micrograms measure mass. Milliliters measure liquid volume. U-100 syringe units are markings based on a syringe scale where 100 units equal 1 mL.
Keeping those categories separate is important because many calculation errors happen when mass, volume, and syringe markings are mixed together.
Safety and medical disclaimer
This website is informational only. It cannot evaluate sterility, product identity, storage, contraindications, interactions, legal status, or individual health needs.
Always consult a licensed healthcare professional or pharmacist before using any medication or injectable product.
Common calculation examples
| Vial amount | Water added | Concentration | Selected amount | mL result | U-100 units |
|---|---|---|---|---|---|
| 5 mg | 1 mL | 5000 mcg/mL | 250 mcg | 0.05 mL | 5 units |
| 5 mg | 2 mL | 2500 mcg/mL | 250 mcg | 0.1 mL | 10 units |
| 10 mg | 2 mL | 5000 mcg/mL | 500 mcg | 0.1 mL | 10 units |
| 10 mg | 3 mL | 3333 mcg/mL | 500 mcg | 0.15 mL | 15 units |
| 15 mg | 3 mL | 5000 mcg/mL | 1000 mcg | 0.2 mL | 20 units |
Frequently asked questions
Does this calculator recommend a peptide dose?
No. It only performs unit conversion and reconstitution math for a selected calculation amount. It does not provide medical advice, prescriptions, dosing schedules, or safety guidance.
What does U-100 mean?
U-100 means 100 insulin syringe units equal 1 mL. The calculator converts the selected mL result into U-100 markings by multiplying mL by 100.
Can this replace advice from a clinician or pharmacist?
No. Any medication, injectable product, or research material can involve risks that math alone cannot evaluate. Consult a licensed healthcare professional or pharmacist.
How many mcg are in one syringe unit?
There is no fixed mcg value per unit. On a U-100 syringe, one unit represents 0.01 mL, so mcg per unit = concentration in mcg/mL / 100. At 2,500 mcg/mL, one unit represents 25 mcg.
Does adding more water change the total mg in the vial?
In the calculator model, the total mass stays the same. Doubling the volume halves the concentration and doubles the volume corresponding to the same selected amount.
Can this calculator choose a peptide dose?
No. You supply the amount in mcg. The tool converts that amount to a volume and U-100 marking; it does not select an amount or schedule.
Peptide education