DoseUnits

You have a vial, some water and a dose to work out. These calculators do the one job in the middle: they turn the amount on the label and the water you added into the exact number of units to draw. No sign-up. Nothing you type leaves your browser.

Start with a tool

Peptide calculator The main tool. Dose to units, a reverse mode that works out the water for the draw you want, and a blend mode for vials with more than one compound. Reconstitution calculator How much BAC water to add so your dose comes out at a draw you can actually read. Peptide dosage chart Units for the standard vial sizes and mixes, in tables you can print or save as a PDF. How to reconstitute peptides Mixing a vial, step by step. Includes the mistakes that ruin vials, because most of them happen in the first two minutes.

Units measure volume. They are not a dose.

This is the mistake behind most bad draws, so it sits on the front page. Ten units is 0.10 mL of liquid. Full stop. How much is dissolved in that liquid depends entirely on how the vial was mixed. Mix 10 mg into 1 mL and 10 units holds 1 mg. Mix the same 10 mg into 10 mL and 10 units holds 0.1 mg.

That is why every result here shows your dose in mg and mcg right next to the units. If the two ever stop matching what you expected, stop and check the mix before you draw.

How the maths works

Three steps, and every tool on the site is just these:

Work out the concentration. Vial amount divided by water volume. A 5 mg vial in 2 mL of water gives 2,500 mcg in every mL.
Work out the draw volume. Your dose divided by the concentration. 250 mcg from that mix is 0.10 mL.
Turn the volume into units. A U-100 syringe holds 100 units per mL, so 0.10 mL is 10 units. Done.

The Methodology page has the formulas written out properly, where the facts on this site come from, and the test cases every result has to pass.

Compound calculators

Pick a compound and the main calculator opens with its vial sizes already there. Pages with tables for each compound are in the works. The presets already do the same maths.

Retatrutide calculator 5 to 60 mg vials · lyophilized powder vial Tirzepatide calculator 5 to 60 mg vials · lyophilized powder vial Semaglutide calculator 5 to 30 mg vials · lyophilized powder vial (not a pen) BPC-157 calculator 5 to 10 mg vials · lyophilized powder vial

About this site

Is DoseUnits free?

Yes, all of it. The calculators, the chart and the guide cost nothing and there is no account to create.

Where do the numbers come from?

From whatever you type in. One calculation engine works out every result on the site, including the tables and the PDF, and it only ever sees your vial amount, your water volume and your dose. The formulas and the tests behind them are written up on the Methodology page.

Is anything I type stored or sent anywhere?

No. The maths runs in your browser, on your device. Nothing is uploaded, and there is no database of calculations sitting somewhere. If you copy a result link, the link itself holds the numbers you typed, and nothing else.

Does DoseUnits tell me how much to take?

No, and it never will. The tools convert between amounts, volumes and syringe units. Choosing an amount is a medical decision, and this site stays out of it. Talk to a clinician about anything like that.

Why does the site keep saying units are not a dose?

Because mixing the two up causes real harm. A unit is a volume: 10 units is 0.10 mL of liquid. What is dissolved in that liquid depends on how the vial was mixed, so 10 units from one vial can hold ten times what 10 units from another vial holds.