About PepUnits

PepUnits is a free peptide reconstitution calculator. You enter a few numbers about your research sample, and it returns the volume to draw and the matching mark on a standard U-100 insulin syringe.

The site runs two tools. The main calculator handles a single peptide in one vial. A separate blend calculator handles a mix of peptides in one vial.

PepUnits is built for research-planning math only. It does not pick a target for you, and it does not give medical advice.

PepUnits was built by Garret Grant, an independent researcher and software engineer. He holds a B.S. in Civil Engineering from UCLA and writes the calculator logic himself.

PepUnits is part of the same research toolset as PepPal and Peptide Dosing Protocols. The goal across all of them is simple math you can check, not marketing claims. Every formula on PepUnits is one he can show on the page so you can verify the result yourself.

Garret is not a doctor, pharmacist, or licensed medical professional, and PepUnits does not provide medical advice.

The main PepUnits calculator works in four short steps.

1. Pick your syringe scale: 0.3 mL (30 units), 0.5 mL (50 units), or 1.0 mL (100 units).
2. Enter the total sample mass in the vial, such as 5 mg or 10 mg.
3. Enter your target amount in mcg or mg.
4. Enter the diluent volume, usually bacteriostatic water, in mL.

PepUnits then shows the concentration in mcg/mL, the draw volume in mL, and the matching point on a U-100 syringe. A visual unit scale points to that mark so it is easy to read.

If you use Orbitrex research samples, you can pick a sample from a dropdown to fill in the vial mass, then fine-tune the other fields.

PepUnits shows its math so you never have to trust a black box. The whole result comes from three plain steps.

First it finds concentration: the total amount in the vial divided by the diluent volume. A 5 mg vial in 1 mL of water is 5,000 mcg/mL.

Then it finds draw volume: your target amount divided by that concentration. A 1 mg target at 5,000 mcg/mL is 0.2 mL.

Last it converts to units: on a U-100 syringe, 1 mL is 100 units, so 0.2 mL is 20 units. That is the mark PepUnits points to.

The blend calculator is for one vial that holds more than one peptide. You enter each peptide's amount, the shared diluent volume, and a target unit mark.

It returns the draw volume and how much of each peptide is in that draw. This helps when a single vial is pre-mixed, so one draw contains a set ratio of each compound.

PepUnits is a calculator, so there are clear limits on what it does.

• It does not set a target amount or recommend one.
• It does not give medical, dosing, or treatment advice.
• It does not confirm a peptide is right for any person or use.
• It does not check the legal status of a compound in your area.

Your target comes from your own protocol or source. For protocol-focused research, a resource like Peptide Dosing Protocols covers that separately.

Many peptide calculators exist, so here is where PepUnits focuses.

• Unit-first output built around the U-100 syringe mark.
• A separate blend calculator for multi-peptide vials.
• Sample presets that fill in the vial mass for you.
• Free with no account, plus an optional save if you want to reuse a setup.

PepUnits lists a research-sample partner and basic supplies so the math links to real vials.