How do you calculate a peptide dose?

Divide the peptide in the vial (mg) by the water you added (mL) to get the concentration (mg/mL). Divide your dose by that concentration to get the volume to draw (mL), then multiply by 100 to get the units on a U-100 insulin syringe. This calculator does all three steps and shows the formula.

How do you dose a peptide by body weight?

A per-kilogram dose (mcg/kg) times your body weight in kilograms gives the total dose in micrograms. The by-weight tab does this, then feeds the result into the units-to-draw math. Research per-kilogram amounts come from studies, not from this tool; it only does the arithmetic.

Is this the same as a reconstitution calculator?

They overlap. A reconstitution calculator works out how much water to add to a vial; a dosage calculator works out how much to draw for a given dose. This page does the dose-to-units step; our reconstitution calculator helps you pick the water volume.

Peptide dosage calculator

Q: How many units is my peptide dose on an insulin syringe?

Every insulin syringe is marked 100 units to 1 mL (U-100), whatever its length. Units to draw = (dose in mg / concentration in mg/mL) * 100. Enter your vial strength, water and dose above and the calculator gives the units, the volume and mcg per unit.

Enter your vial strength, the water you added and the dose you want. Get the exact insulin-syringe units to draw, the volume, micrograms per unit and how many doses the vial holds — every number shown with the formula behind it.

This tool does the arithmetic only. It is not medical advice and does not recommend a dose; research dose ranges on this site always name their source. Grey Peptides sells nothing and links to no vendor.

Peptide in the vial mg

Water you added mL of bacteriostatic water

Dose you want

Your numbers stay in this browser tab: nothing is stored or sent anywhere.

How the peptide dosage calculator works

Three numbers turn a vial into a dose. First the concentration: the peptide in the vial divided by the water you added. A 5 mg vial in 2 mL of bacteriostatic water is 2.5 mg/mL. Then the volume your dose needs: the dose divided by that concentration. Then the units: every insulin syringe is marked 100 units to 1 mL (that is what “U-100” means), whatever its length, so the units to draw are just the volume in millilitres times 100.

The formula, in full

concentration = vial mg ÷ water mL
volume to draw (mL) = dose mg ÷ concentration
units (U-100) = volume mL × 100

So a 250 mcg dose from that 2.5 mg/mL vial is 0.1 mL, or 10 units. The calculator also shows micrograms per unit (handy once a vial is mixed) and how many doses the vial holds.

Dosing a peptide by body weight

Some research dose ranges are given per kilogram (mcg/kg). The dose by body weight tab multiplies a per-kilogram amount by your weight to get the total micrograms, then carries that into the units math. The per-kilogram figure itself has to come from the literature — this tool only does the arithmetic, and the dose pages on this site always cite where a number came from.

Dosage vs reconstitution

These two questions are often mixed up. Reconstitution is how much water to add to the powder; dosage is how much to draw once it is mixed. If you have not mixed the vial yet, start with the reconstitution calculator to choose a water volume that makes your dose land on an easy number of units — then this page gives the draw.

Reconstitution calculator → Sequence & MW calculator → Half-life visualizer → Dosage hub → All tools →

Common questions

How many units is my peptide dose on an insulin syringe?

Units to draw = (dose in mg ÷ concentration in mg/mL) × 100. Fill in the vial strength, water and dose above and the calculator gives the units, the volume and the micrograms each unit holds.

Is a dosage calculator the same as a dose calculator?

Yes — “peptide dosage calculator,” “peptide dose calculator” and “peptide dosing calculator” all mean the same thing: working out how much of a mixed vial to draw for the dose you want. That is what this page does.

No dose on this page is a recommendation. Research peptides are not approved medicines; dose ranges in the literature are study conditions, not instructions. Talk to a qualified clinician about anything you intend to use.