Conversions
Converting mg, mcg, and Syringe Units
Peptide math involves three different scales: mass (mg and mcg), volume (mL), and syringe units. Mix them up and your dose can be off by a factor of 1,000. Here's every conversion you need in one place.
Mass: milligrams and micrograms
To go from mg to mcg, multiply by 1,000. To go from mcg to mg, divide by 1,000. Vials are usually labeled in mg; doses are often written in mcg, so this is the conversion you'll use most.
| Micrograms (mcg) | Milligrams (mg) |
|---|---|
| 100 mcg | 0.1 mg |
| 250 mcg | 0.25 mg |
| 500 mcg | 0.5 mg |
| 1,000 mcg | 1 mg |
Volume to units
Mass doesn't convert directly to units. You first turn your dose into a volume (using the concentration), then turn the volume into units using your syringe's scale.
U-100: × 100 · U-50: × 50 · U-40: × 40
| Volume | U-100 | U-50 | U-40 |
|---|---|---|---|
| 0.05 mL | 5 | 2.5 | 2 |
| 0.10 mL | 10 | 5 | 4 |
| 0.20 mL | 20 | 10 | 8 |
| 0.50 mL | 50 | 25 | 20 |
Putting it together
The full chain for any dose is:
volume (mL) × units-per-mL = syringe units
Example: a 250 mcg dose with a 2.5 mg/mL concentration on a U-100 syringe → 0.25 mg ÷ 2.5 = 0.1 mL → 0.1 × 100 = 10 units.
Skip the conversions
Enter your numbers in mg or mcg, pick your syringe, and the calculator handles every conversion for you.
Open the free calculatorThis guide is for calculation and educational purposes only and is not medical advice. It does not recommend any peptide, dose, or protocol. Always consult a qualified clinician before starting, changing, or stopping any peptide.