Peptide Dose Calculator
Convert any dose — milligrams or micrograms — into marks on your insulin syringe. It works with any peptide: just enter the vial and the water you reconstituted with.
Water doesn't change the dose — it changes how many units the dose takes up.
U-100 and U-50 share the same scale — 100 units per mL. The U-50 just has half the barrel (0.5 mL), so it stops at 50. The U-40 marks 40 units per mL, which is a different scale. Check what's printed on yours.
Fill in the vial, the water and the dose to see the result.
Personal journal. Not medical advice.
How the dose calculation works
From the milligrams on the label to the mark on the syringe, by way of the vial's concentration. The three steps below are solved with the calculator's values.
Concentration
Milligrams in the vial ÷ mL of water = how many mg sit in each mL.
vial ÷ water = concentration10 mg ÷ 2 mL = 5 mg/mLVolume per dose
Dose ÷ concentration = how many mL you need to draw.
dose ÷ concentration = mL1 mg ÷ 5 = 0.2 mLUnits on the syringe
mL × 100 on a U-100 or U-50 syringe (or × 40 on a U-40) = the mark to stop at.
mL × 100 = units0.2 mL × 100 = 20 unitsThe whole thing in one formula
units = dose ÷ (vial ÷ water) × 100Vial in mg, water in mL, dose in mg. The 100 covers U-100 and U-50; swap it for 40 if your syringe is a U-40.
A 10 mg vial with 2 mL of water gives 5 mg/mL. A 1,000 mcg dose takes up 0.2 mL — that's 20 units on a U-100 syringe.
The conversions people look up
How many units is 1000 mcg?
In a 10 mg vial with 2 mL (5 mg/mL), 1000 mcg is 1 mg — 0.2 mL, or 20 units on a U-100.
And 500 mcg?
10 units in the same vial. 500 mcg is 0.5 mg, or 0.1 mL.
And 2000 mcg?
40 units. 2000 mcg is 2 mg, or 0.4 mL at a concentration of 5 mg/mL.
How many mL is 20 units?
0.2 mL on a U-100 syringe and 0.5 mL on a U-40 — same mark, different volume.
Units by dose and dilution
A 10 mg vial on a U-100 syringe. Columns are the water you used to reconstitute.
| Dose | 1 mL | 2 mL | 3 mL | 5 mL |
|---|---|---|---|---|
| 250 mcg | 2.5 | 5 | 7.5 | 12.5 |
| 500 mcg | 5 | 10 | 15 | 25 |
| 1,000 mcg | 10 | 20 | 30 | 50 |
| 2,000 mcg | 20 | 40 | 60 | 100 |
| 5,000 mcg | 50 | 100 | 150 | 250 |
From micrograms to units, without tripping
Three different units meet in this calculation, and that's where most mistakes are born. The vial label speaks in milligrams. The protocol sometimes speaks in micrograms. And the syringe speaks neither: it's marked in units, which are fractions of a millilitre.
The bridges are simple. 1 mg = 1000 mcg, always. And on a U-100 syringe, 100 units = 1 mL — so 20 units is 0.2 mL. What links the peptide to the volume is your vial's concentration, which only exists once you've chosen how much water to add.
One detail that saves people: a unit is not a measure of peptide, it's a measure of liquid. Two people can draw 20 units and receive completely different doses if they reconstituted their vials differently. Whenever someone says “I take 20 units”, half the information is missing.
Do this math once. Once.
In PepPro you enter the vial and the water a single time. From then on the app works out every injection on its own, shows the units on a visual syringe, reminds you at the right moment and keeps the whole history.
- Your reconstitution stays saved per vial
- Exact units on a visual syringe before you inject
- Reminders, titration and injection-site rotation
- Full history of doses, weight and how you feel
Exact units on a visual syringe before you inject
Good question. We've got answers.
Didn't find what you were after? Email us at contato@upsidecompany.com.br.
No, but they travel together. A unit is a mark on the syringe's scale. On a U-100, 100 units equal 1 mL, so 20 units is 0.2 mL. Since the peptide label is in mg or mcg, the conversion always goes through the vial's concentration.
1 mg = 1000 mcg. Repair and cosmetic doses (BPC-157, TB-500, GHK-Cu) are usually written in micrograms; GLP-1s like semaglutide and tirzepatide usually come in milligrams. Swapping the two is a thousand-fold error, so it's worth checking twice.
Divide the vial's milligrams by the mL of water to get the concentration. Divide your dose by that concentration to get the volume in mL. Multiply by 100 on a U-100 syringe (or by 40 on a U-40). Example: 10 mg in 2 mL gives 5 mg/mL; a 1 mg dose is 0.2 mL, or 20 units.
Yes. The math is identical for semaglutide, tirzepatide, BPC-157, tesamorelin, ipamorelin or a compound you added yourself. What changes between them is the usual dose and the vial size — not the calculation.
If the result goes past 100 units on a U-100, that dose doesn't fit in one injection. Reconstitute with less water to concentrate it: half the water means half the units for the same dose.
Yes — that's exactly what PepPro is for. Enter the vial and the reconstitution once and the app takes over: it works out every injection, shows the units on a visual syringe, reminds you when it's time and keeps the history of doses, weight and how you feel.
No. PepPro is a personal journal and this calculator is an educational tool. Nothing here replaces a qualified healthcare professional — they're the one who decides whether, how much and how you should use any compound.
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Personal journal. Not medical advice.
Disclaimer
This calculator is for informational and educational purposes only and is not medical advice. Always confirm dosing with a qualified healthcare professional and double-check your own measurements before administering anything.