How the calculator works
Every peptide calculator runs the same three lines of arithmetic. Here they are, so you can check any result by hand.
concentration (mg/mL) = amount in vial (mg) ÷ water added (mL)
volume to draw (mL) = dose (mg) ÷ concentration (mg/mL)
syringe units = volume (mL) × 100 (U-100 syringe: 100 units = 1 mL)
- Concentration. A freeze-dried vial holds a fixed amount, printed on the label. Adding water spreads it through that volume. 10 mg in 2 mL is 5 mg per mL.
- Volume. Divide the dose on your prescription by the concentration. The result is the millilitres that contain that dose.
- Units. A U-100 insulin syringe is marked so that 100 units is 1 mL. Multiply millilitres by 100.
What one vial looks like at different dilutions
The same 10 mg vial, mixed with different amounts of water. The peptide in the vial never changes; only the strength of each unit does.
| Water added | Concentration | In every 10 units |
|---|---|---|
| 1 mL | 10 mg/mL | 1 mg |
| 2 mL | 5 mg/mL | 0.5 mg |
| 3 mL | 3.333 mg/mL | 0.3333 mg |
| 5 mL | 2 mg/mL | 0.2 mg |
Things the arithmetic assumes
- The syringe is U-100. U-40 and U-500 syringes use different markings and will give a wrong draw.
- The vial holds what the label says, and all of the water you measured went in.
- mcg and mg are not mixed up. 1 mg is 1,000 mcg.
Try it
mg
mL
units
Enter the vial size and the water you added.
Arithmetic only. This tool does not recommend a dose; use the one your prescriber gave you.