Lookup

The common combinations, precomputed.

Five vial sizes, five water volumes, six dose sizes. If your combination is here, you can read the syringe mark straight off rather than working it out.

Cost: Free
Vial sizes: 2 to 30 mg
Syringe: U-100
Data: Nothing stored

2 mg vial

Units on a U-100 syringe

Syringe units for a 2 mg vial at each water volume and dose
Dose	1 ml	1.5 ml	2 ml	2.5 ml	3 ml
100 mcg	5	7.5	10	12.5	15
250 mcg	12.5	18.75	25	31.25	37.5
500 mcg	25	37.5	50	62.5	75
1 mg	50	75	100	—	—

5 mg vial

Units on a U-100 syringe

Syringe units for a 5 mg vial at each water volume and dose
Dose	1 ml	1.5 ml	2 ml	2.5 ml	3 ml
100 mcg	2	3	4	5	6
250 mcg	5	7.5	10	12.5	15
500 mcg	10	15	20	25	30
1 mg	20	30	40	50	60
2.5 mg	50	75	100	—	—
5 mg	100	—	—	—	—

10 mg vial

Units on a U-100 syringe

Syringe units for a 10 mg vial at each water volume and dose
Dose	1 ml	1.5 ml	2 ml	2.5 ml	3 ml
100 mcg	—	—	2	2.5	3
250 mcg	2.5	3.75	5	6.25	7.5
500 mcg	5	7.5	10	12.5	15
1 mg	10	15	20	25	30
2.5 mg	25	37.5	50	62.5	75
5 mg	50	75	100	—	—

15 mg vial

Units on a U-100 syringe

Syringe units for a 15 mg vial at each water volume and dose
Dose	1 ml	1.5 ml	2 ml	2.5 ml	3 ml
100 mcg	—	—	—	—	2
250 mcg	—	2.5	3.33	4.17	5
500 mcg	3.33	5	6.67	8.33	10
1 mg	6.67	10	13.33	16.67	20
2.5 mg	16.67	25	33.33	41.67	50
5 mg	33.33	50	66.67	83.33	100

30 mg vial

Units on a U-100 syringe

Syringe units for a 30 mg vial at each water volume and dose
Dose	1 ml	1.5 ml	2 ml	2.5 ml	3 ml
100 mcg	—	—	—	—	—
250 mcg	—	—	—	2.08	2.5
500 mcg	—	2.5	3.33	4.17	5
1 mg	3.33	5	6.67	8.33	10
2.5 mg	8.33	12.5	16.67	20.83	25
5 mg	16.67	25	33.33	41.67	50

Dashes mark combinations that fall under two units or overflow a 100-unit syringe, both are hard to draw accurately. Everything here is computed with the same arithmetic as the reconstitution calculator.

The science

A chart is a shortcut, not a different calculation

Every number in these tables comes from the same three steps as the calculator: concentration is vial size divided by water, volume is dose divided by concentration, and units are volume times one hundred.

The tables exist because most people use a handful of standard combinations. A 5 mg vial in 2 ml, dosed at 250 mcg, is common enough to be worth looking up rather than recomputing each time.

Combinations shown as a dash are ones to avoid. Below two units the graduation spacing on a syringe is a large share of the dose; above a hundred units it will not fit a standard U-100 barrel at all.

If your vial or dose is not in the table, the calculator handles any combination. The chart is a convenience for the common cases, not a limit on what is possible.

FAQ

Common questions

How many units is 250 mcg of BPC-157?

It depends on the water volume. With a 5 mg vial reconstituted in 2 ml the concentration is 2.5 mg/ml, so 250 mcg is 0.1 ml, 10 units on a U-100 syringe. Reconstitute the same vial in 1 ml and the same dose becomes 5 units.

What is the standard water volume for a peptide vial?

There is no standard, because the volume only sets the concentration rather than the amount of peptide. 2 ml is a common choice for 5 and 10 mg vials because it produces round unit numbers at typical dose sizes.

Why do some cells in the chart show a dash?

Those combinations produce a draw either below two units, where measurement error becomes significant, or above a hundred units, which will not fit a standard insulin syringe.

Can I use this chart for GLP-1 medications?

Only if you are drawing from a vial. Pre-filled pens deliver a measured dose and require no conversion at all.

Sources

Where this comes from

Regulatory status and approved dosing are quoted from the primary source rather than summarised from memory. Each link below says what it is being cited for.

Bulk Drug Substances Used in Compounding Under Section 503A of the FD&C ActU.S. Food and Drug AdministrationThe three-category framework FDA applies to substances nominated for pharmacy compounding.Link checked 1 October 2026

VialClock

This page calculates. Your notes app forgets.

Every tool here is stateless by design. What it cannot do is remember that your vial was mixed eleven days ago, or that a step-up is due this week.

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This tool performs arithmetic on figures you enter, or presents a manufacturer-published schedule. It does not know your protocol, will never suggest a dose, and is not medical advice. Dosing decisions belong with a qualified prescriber.