Need a little more explanation?
Does a correct answer mean the vial is safe to use?
No. This tool checks arithmetic from the numbers you enter. It cannot check the actual contents, contamination, human evidence, or an appropriate dose. What research use only means →
What do mg, mcg, mL, and units mean?
mg (milligrams) and mcg (micrograms) tell you how much peptide there is. One mg equals 1,000 mcg. mL (milliliters) tells you how much liquid there is. U-100 units are syringe markings: 100 units = 1 mL, so 10 units = 0.1 mL. Units are not milligrams; the amount of peptide depends on how concentrated the liquid is.
Does syringe size change the answer?
On a U-100 syringe, 10 units always represents 0.1 mL. A 0.3 mL syringe holds up to 30 units, a 0.5 mL syringe up to 50, and a 1 mL syringe up to 100. The capacity changes; the U-100 conversion stays the same. Actual tick spacing varies. This calculator does not convert U-40 or other scales.
How does the liquid-planning view work?
Enter the total mg printed on your vial and the mg or mcg you want to calculate for one dose. Then see how many U-100 syringe units that dose would fill at different final liquid volumes. You can also enter a syringe-unit number to work backward to a final mixed volume. Those numbers alone cannot tell you which liquid amount is suitable for a specific vial. Read the compound guide and its sources →
Does the 30-day view choose my dose?
No. It counts the dates in a 30-day window, divides the whole vial into that many equal parts, and shows both the mg and U-100 syringe units in one part. That does not establish whether the amount is appropriate or whether a mixed vial stays usable for 30 days. Community-reported ranges appear only when we have a direct source for the compound and schedule; otherwise the view says that comparison is unavailable. Read the storage guide →
Are mL, cc, and U-100 marks the same thing?
1 mL equals 1 cc. On a U-100 syringe, 100 marks represents 1 mL of volume. The dropdown converts between these labels while keeping the liquid amount the same. NIST volume units ↗ · FDA syringe guidance ↗
Why mention the final mixed volume?
The exact formula uses the total liquid volume after mixing. To keep the entry simple, this calculator treats the liquid added as that final volume. If you know a measured final volume, enter it in step 2 instead. Adding more liquid lowers the concentration and increases the mL needed for the same entered dose.
Does Mounjaro need water? What if a vial looks gel-like?
Mounjaro is supplied as an already-prepared liquid, including its vial versions. A dry powder sold as tirzepatide is a different product format. There is no verified universal liquid amount for a retatrutide research vial. If material is cloudy, gel-like, or undissolved, this calculator cannot tell you how to fix the product. Check its manufacturer information and the original product source. Mounjaro label ↗ · Retatrutide research status ↗ · Bacteriostatic-water label ↗
What about blends?
Enter the total labeled amount of the blend. The result describes the whole blend, not the amount of each ingredient. To calculate one ingredient, you need its listed mg or a reliable ingredient ratio.
Can I see the formula and an example?
Peptide per mL = total mg in the vial ÷ final mixed mL. Liquid for your dose = your dose in mg ÷ peptide per mL. U-100 units = liquid mL × 100.
Math example: 10 mg in 2 mL gives 5 mg per mL. An entered dose of 0.5 mg (500 mcg) corresponds to 0.1 mL, or 10 U-100 units. These example numbers demonstrate arithmetic.
The math assumes the labeled amount is evenly distributed in the final mixed volume. A fraction of a unit may fall between syringe marks. The picture cannot show how accurately your syringe measures that amount. See the calculator formulas and assumptions →