Peptide Dosing Calculator: The Math Made Simple
The relationship between milligrams, micrograms, milliliters, and insulin syringe units trips up every new researcher. Here is the math, explained once, clearly.
The Core Conversion
Everything starts with one relationship:
1 mg = 1,000 mcg. Peptides are dosed in mcg; they are sold in mg. Convert first, then work in mcg throughout.
Concentration Math
When you reconstitute, you are creating a concentration: mg of peptide per mL of water.
Concentration (mcg/mL) = (peptide mg × 1000) ÷ mL of water added
| Peptide | Water Added | Concentration |
|---|---|---|
| 5 mg | 1 mL | 5,000 mcg/mL |
| 5 mg | 2 mL | 2,500 mcg/mL |
| 5 mg | 5 mL | 1,000 mcg/mL |
| 10 mg | 2 mL | 5,000 mcg/mL |
| 10 mg | 10 mL | 1,000 mcg/mL |
Insulin Syringe Units
A U-100 insulin syringe holds 1 mL and has 100 units marked on it. Each unit = 0.01 mL.
Volume for a dose (mL) = desired mcg ÷ concentration (mcg/mL)
Units on syringe = volume (mL) × 100
Worked Example
5 mg vial reconstituted with 2 mL bac water. Concentration = 2,500 mcg/mL. You want a 250 mcg dose.
- 1
Volume = 250 ÷ 2,500 = 0.1 mL
- 2
Syringe units = 0.1 × 100 = 10 units
Adding 2 mL to a 5 mg vial gives 2,500 mcg/mL. Every 10 syringe units = 250 mcg. Clean mental math, easy to verify.
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