How to read the dosage chartEach cell is the number of units on a U-100 syringe for that amount. The amounts are round numbers for arithmetic. They are not doses for any peptide, and a dash means the amount is bigger than the whole vial.
2 mg vial
A 2 mg vial mixed with 2 mL holds 10 mcg per unit, so 100 mcg is 10 units.
| Amount | 1 mL | 1.5 mL | 2 mL | 2.5 mL | 3 mL |
|---|---|---|---|---|---|
| 25 mcg | 1.3 | 1.9 | 2.5 | 3.1 | 3.8 |
| 50 mcg | 2.5 | 3.8 | 5 | 6.3 | 7.5 |
| 100 mcg | 5 | 7.5 | 10 | 12.5 | 15 |
| 150 mcg | 7.5 | 11.3 | 15 | 18.7 | 22.5 |
| 200 mcg | 10 | 15 | 20 | 25 | 30 |
| 250 mcg | 12.5 | 18.8 | 25 | 31.3 | 37.5 |
| 300 mcg | 15 | 22.5 | 30 | 37.5 | 45 |
| 400 mcg | 20 | 30 | 40 | 50 | 60 |
| 500 mcg | 25 | 37.5 | 50 | 62.5 | 75 |
| 750 mcg | 37.5 | 56.3 | 75 | 93.8 | 112.5 |
| 1,000 mcg | 50 | 75 | 100 | 125 | 150 |
A 2 mg vial is dilute at any common volume: with 2 mL each unit holds only 10 mcg, so amounts over 300 mcg need more than a 30-unit syringe.
5 mg vial
A 5 mg vial mixed with 2 mL holds 25 mcg per unit, so 100 mcg is 4 units and 250 mcg is 10 units.
| Amount | 1 mL | 1.5 mL | 2 mL | 2.5 mL | 3 mL |
|---|---|---|---|---|---|
| 25 mcg | 0.5 | 0.8 | 1 | 1.3 | 1.5 |
| 50 mcg | 1 | 1.5 | 2 | 2.5 | 3 |
| 100 mcg | 2 | 3 | 4 | 5 | 6 |
| 150 mcg | 3 | 4.5 | 6 | 7.5 | 9 |
| 200 mcg | 4 | 6 | 8 | 10 | 12 |
| 250 mcg | 5 | 7.5 | 10 | 12.5 | 15 |
| 300 mcg | 6 | 9 | 12 | 15 | 18 |
| 400 mcg | 8 | 12 | 16 | 20 | 24 |
| 500 mcg | 10 | 15 | 20 | 25 | 30 |
| 750 mcg | 15 | 22.5 | 30 | 37.5 | 45 |
| 1,000 mcg | 20 | 30 | 40 | 50 | 60 |
10 mg vial
A 10 mg vial mixed with 2 mL holds 50 mcg per unit, so 500 mcg is 10 units.
| Amount | 1 mL | 1.5 mL | 2 mL | 2.5 mL | 3 mL |
|---|---|---|---|---|---|
| 25 mcg | 0.3 | 0.4 | 0.5 | 0.6 | 0.8 |
| 50 mcg | 0.5 | 0.8 | 1 | 1.3 | 1.5 |
| 100 mcg | 1 | 1.5 | 2 | 2.5 | 3 |
| 150 mcg | 1.5 | 2.3 | 3 | 3.8 | 4.5 |
| 200 mcg | 2 | 3 | 4 | 5 | 6 |
| 250 mcg | 2.5 | 3.8 | 5 | 6.3 | 7.5 |
| 300 mcg | 3 | 4.5 | 6 | 7.5 | 9 |
| 400 mcg | 4 | 6 | 8 | 10 | 12 |
| 500 mcg | 5 | 7.5 | 10 | 12.5 | 15 |
| 750 mcg | 7.5 | 11.2 | 15 | 18.8 | 22.5 |
| 1,000 mcg | 10 | 15 | 20 | 25 | 30 |
At 1 mL a 10 mg vial is 10 mg/mL. Then 25 mcg is a quarter of a unit and 50 mcg is half a unit, which no standard syringe can measure. That is the main reason people add more liquid to larger vials.
Insulin syringe for peptides: what the units mean
Every number on this page assumes a U-100 insulin syringe, on which 100 units equal 1 mL and one unit is 0.01 mL.[1] Syringes marked U-40, or only in mL, give different readings. A syringe "unit" is a volume mark, not a measure of how much peptide it holds; that depends on the concentration.
Check a reading: units back to mcg
If you already have a number of units, this checker gives the micrograms they hold at your concentration.
units_checker
units drawn → mcg in the syringe
Calculating…
Formula. Concentration = mg in vial ÷ mL added. Units = (dose ÷ concentration) × 100 on a U-100 syringe. This tool does math only and does not recommend doses.
Does the powder add volume?
Sometimes, and the simple formula ignores it: it assumes the final volume equals the liquid you added. For small peptide amounts the difference is usually negligible, but an approved product shows it can matter. Egrifta WR adds 1.3 mL to an 11.6 mg vial, yet its label states the mixed concentration as 8 mg/mL, not the 8.92 mg/mL that 11.6 ÷ 1.3 would give.[2] When a label states a concentration, use the label's figure; when it does not, the calculator's answer is an approximation for the reason above.
Largest amount each syringe holds
A U-100 syringe holds 30, 50 or 100 units, which is 0.3, 0.5 or 1 mL.[1] This table shows the most a full syringe can hold at each concentration.
| Concentration | 30 units (0.3 mL) | 50 units (0.5 mL) | 100 units (1 mL) |
|---|---|---|---|
| 0.5 mg/mL | 150 mcg | 250 mcg | 500 mcg |
| 1 mg/mL | 300 mcg | 500 mcg | 1,000 mcg |
| 2 mg/mL | 600 mcg | 1,000 mcg | 2,000 mcg |
| 2.5 mg/mL | 750 mcg | 1,250 mcg | 2,500 mcg |
| 3.33 mg/mL | 999 mcg | 1,665 mcg | 3,330 mcg |
| 5 mg/mL | 1,500 mcg | 2,500 mcg | 5,000 mcg |
| 10 mg/mL | 3,000 mcg | 5,000 mcg | 10,000 mcg |
The formula behind every cell
Every cell is the amount in mcg times the mL of liquid, divided by ten times the vial's mg.
Check any cell: 250 mcg from a 5 mg vial with 2 mL is 250 × 2 ÷ (5 × 10) = 10 units. Every table on this site is generated from this formula at build time, using the same code as the calculator. The code is on the formulas page.
Other tools
- Peptide calculatorAny vial, any liquid volume, any amount
- mg ↔ mcg chartUnit conversions and mcg per unit
- Two-peptide vialsHow one draw splits between two peptides
Frequently asked questions
Who decides how much bac water to add?
For an approved product, its label sets the diluent and the volume. Bacteriostatic water's own label says it is only for dissolving drugs as each drug's manufacturer directs.[3] For products without a label, no tested volume exists; the calculator only shows the arithmetic for whatever volume is used.
How many units is 250 mcg from a 5 mg vial?
It depends on the liquid added: 5 units with 1 mL, 7.5 units with 1.5 mL, 10 units with 2 mL, 12.5 units with 2.5 mL, 15 units with 3 mL.
How many units is 500 mcg from a 10 mg vial?
5 units with 1 mL, 10 units with 2 mL, 15 units with 3 mL. More liquid means more units for the same amount.
Why are some cells marked with a dash?
The amount is larger than the whole vial. For example, 1,000 mcg cannot come out of a 0.5 mg vial at any dilution.