Peptide Units Converter
Convert between mg, mcg, syringe units, IU, and ml. Four modes, one tool. Enter a value, get the result instantly.
Quick reference
The six conversions you encounter most often when working with peptides. Every one reduces to a single multiply or divide.
mg → mcg
× 1,000
0.25 mg = 250 mcg
mcg → mg
÷ 1,000
500 mcg = 0.5 mg
ml → units
× 100
0.1 ml = 10 units
units → ml
÷ 100
25 units = 0.25 ml
mg → IU
× 3
1 mg ≈ 3 IU
IU → mg
÷ 3
6 IU ≈ 2 mg
U-100 insulin syringe sizes
All three sizes use the same standard: 1 unit = 0.01 ml. The math never changes. Only the maximum capacity differs.
| Syringe | Capacity | Max units | Best for |
|---|---|---|---|
| 0.3 ml | 0.3 ml | 30 | Small doses under 30 units. Finest markings. |
| 0.5 ml | 0.5 ml | 50 | Moderate doses between 30-50 units. |
| 1.0 ml | 1.0 ml | 100 | Large doses or loading protocols up to 100 units. |
How peptide unit conversion works
Peptide doses are prescribed in weight (mg or mcg), but you measure them in syringe units. The bridge between the two is concentration, expressed as mg/ml.
Concentration is set during reconstitution: divide the total peptide in the vial by the volume of water you added. A 5 mg vial with 2 ml of BAC water gives you 2.5 mg/ml.
Once you know the concentration, every conversion is the same two steps. To go from dose to units: divide the dose (mg) by the concentration (mg/ml) to get ml, then multiply by 100 for units. To reverse it, divide units by 100 to get ml, then multiply by the concentration.
Forward: units = (dose_mg ÷ concentration) × 100
Reverse: dose_mg = (units ÷ 100) × concentration
Example: 250 mcg at 2.5 mg/ml → (0.25 ÷ 2.5) × 100 = 10 units
Common questions
Units, mass, volume, and how they relate.