Peptide calculator

Find the concentration of your vial and the syringe measurement for any dose you choose.

Calculate a measured volume

Choose the product and vial you have, then enter the final volume of liquid in it. A target dose is optional: leave it empty and you still get the concentration and what each syringe marking holds.

Your result

Your result will appear here after you choose a product, enter the final volume and select Show my result. A target dose is optional.

Arithmetic reference only. The calculator does not determine a dose, route, solvent or storage period. For Research Use Only — Not for Human Consumption.

More tools: spray, supply & per-kg

Optional arithmetic from values you provide. These controls do not choose a dose, route, solvent or mixing volume. Spray counts and the weekly supply estimate need a target dose in the main form; the concentration above does not.

Quick help

Which amount do I use for a kit or multipack?

Use the amount in one vial, not the total in the box. Select your product and variant; the calculator shows the amount per vial automatically. Check it against the physical label.

Do I enter the water added or the total liquid?

Enter the final total liquid volume in the vial. For a ready-made solution, use the existing volume. The calculator does not choose a solvent or tell you how much liquid to add.

Do I need to know my dose already?

No. Select your product and enter the final liquid volume, and the calculator shows the concentration and the amount one U-100 marking holds, so you can read any dose off the syringe scale yourself. Enter a target dose as well and it also returns the exact volume and markings for one portion. The calculator does not choose a dose for you; the stack protocols and comparison pages on this site are the reference material.

What does the syringe result mean?

The result shows the equivalent volume on a U-100 syringe scale: 100 markings equal 1 ml. Select your actual syringe capacity. Substance IU and syringe scale markings are different measurements and are not interchangeable.

Where are the spray and supply calculations?

Open More tools below the main calculation. Spray mode needs the measured volume of your pump; supply uses a weekly frequency you provide and describes quantity, not shelf life.

Can I keep a copy of my calculation?

Use Copy or Print once a valid result is displayed. Inputs stay in the current page state; this calculator does not save them or send them as analytics events.

How is the result calculated?
  1. Concentration: amount in one vial ÷ final solution volume. Example: 5 mg ÷ 2 ml = 2.5 mg/ml.
  2. Volume: target amount ÷ concentration, using matching units. Example: 0.5 mg ÷ 2.5 mg/ml = 0.2 ml.
  3. U-100 scale: volume in ml × 100. Example: 0.2 ml × 100 = 20 volume markings.

Examples explain arithmetic only. Check your product label and measurement equipment. IU cannot be substituted for mg.

View all 43 products

Every published product is included. Select a variant to see its calculation support and format details.