Clear inputs. Clear calculations.
Concentration and volume calculations from the values you enter.
This is a mathematical tool. It converts the values you enter into a concentration and a volume. It does not recommend doses, schedules, titration, or administration, and it is not medical advice. Research and education only.
Example values — not recommendations
The total amount in the vial, as printed on the label or certificate of analysis.
Final total volume in mL after any diluent is added. The calculation assumes the number you enter is the final volume.
A value from your own research reference. No dose is suggested here, and nothing is inferred from a compound name.
- U-100 markings are a volume scale: 100 units per millilitre.
- They are not a measure of peptide potency.
Single-compound calculations only. Blends need a quantity for each component, which this tool does not infer from a product name. Calculations run entirely in your browser.
Result
Enter the material amount, solution volume, and target amount to see results.
Mathematical output only. This tool does not recommend a dose, schedule, or route of administration, and it is not medical advice. Calculated precision is not measurement resolution — a calculated volume may be finer than any marking on a physical measuring device.
The math, shown.
Every result on this page comes from four arithmetic steps. Here is each formula, with the numbers worked for a 5 mg vial in 2 mL of diluent and a 500 mcg target dose on a U-100 syringe.
1. Concentration
concentration = peptide in vial ÷ diluent added
5 mg ÷ 2 mL = 2.5 mg/mL (= 2,500 mcg/mL)
2. Volume per dose
volume per dose = target dose ÷ concentration
500 mcg ÷ 2,500 mcg/mL = 0.2 mL
3. Syringe units
syringe units = volume × units per mL (calibration)
0.2 mL × 100 = 20 units on a U-100 syringe
4. Doses per vial
doses per vial = total peptide ÷ target dose
5,000 mcg ÷ 500 mcg = 10 doses
Units, explained.
The calculator only uses five ideas. Once these click, the results are easy to sanity-check yourself.
- mg and mcg
- Milligrams (mg) and micrograms (mcg) measure mass. 1 mg = 1,000 mcg, so a 5 mg vial holds 5,000 mcg. Peptide doses are usually discussed in mcg because the amounts are small.
- mL (milliliters)
- A milliliter measures liquid volume. The diluent you add (typically bacteriostatic water) is measured in mL, and every dose ends up expressed as a volume of liquid.
- Concentration (mg/mL)
- Concentration is how much peptide sits in each milliliter of liquid: peptide amount ÷ diluent volume. Doubling the diluent halves the concentration; the total peptide in the vial never changes.
- Syringe scale markings
- Insulin syringes are marked in units. On a U-100 syringe, every 10 units = 0.1 mL. On U-50, 10 units = 0.2 mL. On U-40, 10 units = 0.25 mL. The numbers on the barrel are volume in disguise.
- Calibration vs. capacity
- Calibration is the marking scale (U-100 = 100 units per mL). Capacity is how much the barrel physically holds. A 0.5 mL U-100 syringe only holds 50 units, but it is still calibrated at 100 units per mL — half a mL of liquid reads 50 units.
Related guides & calculators
Calculator questions, answered.
What does this peptide calculator actually do?
It performs two calculations on values you enter: concentration (total mass in mg divided by final solution volume in mL) and target volume (target mass divided by that concentration). It also converts the volume to a U-100 scale reading if you ask for one.
Does it recommend a dose?
No. It never suggests, recommends, or endorse a dose, schedule, titration step, or route of administration. It is arithmetic on numbers you supply, for research and education only, and it is not medical advice.
How is concentration calculated?
Concentration in mg/mL equals the total material in the vial, converted to mg, divided by the final solution volume in mL. Ten milligrams in 2 mL gives 5 mg/mL.
How is the target volume calculated?
Target volume in mL equals the desired dosage converted to mg, divided by the concentration in mg/mL. At 5 mg/mL, a 0.5 mg dosage is 0.1 mL.
What does the U-100 scale reading mean?
U-100 markings are a volume scale of 100 units per millilitre. It is a way of reading a barrel, not a measure of peptide potency. If you display it, you also choose the scale capacity and its smallest graduation so the reading can be checked against the markings.
Why does a value get flagged instead of rounded?
If a calculated volume is larger than the capacity you selected, or does not land exactly on a graduation step, the calculator flags it and keeps the unrounded value. It never silently rounds a result to a measurable marking, because calculated precision and measurement resolution are not the same thing.
Why did my result disappear?
Results only appear once every required value is valid. Blank, zero, negative, or non-numeric entries are rejected, and a desired dosage larger than the vial amount is refused. Fix the highlighted field and the result returns.
Can I calculate a blend?
Not yet. Blends require a quantity for each component, and the calculator does not infer blend composition from a product name. Single-compound calculations only for now.
Are the values I enter stored?
No. Every calculation runs locally in your browser. Entered amounts are never sent to analytics and are not saved to a profile.