Insulin Syringe Conversion Chart

Insulin syringes measure doses in “units” rather than milliliters. For peptide researchers using insulin syringes for subcutaneous injection, converting between units and mL is essential for accurate dosing.

Syringe Types

Syringe Type	Concentration	Units per mL	Common Use
U-100	100 units/mL	100	Standard insulin, peptide injection
U-500	500 units/mL	500	High-concentration insulin
U-40	40 units/mL	40	Veterinary insulin

Most peptide researchers use U-100 syringes. This chart assumes U-100 unless specified.

U-100 Conversion Table

Core Conversion

mL	Units (U-100)
0.01	1
0.02	2
0.03	3
0.04	4
0.05	5
0.10	10
0.15	15
0.20	20
0.25	25
0.30	30
0.35	35
0.40	40
0.45	45
0.50	50
0.60	60
0.70	70
0.80	80
0.90	90
1.00	100

Formula

Units = Volume (mL) × 100
Volume (mL) = Units ÷ 100

U-500 Conversion Table

mL	Units (U-500)
0.01	5
0.02	10
0.03	15
0.04	20
0.05	25
0.10	50
0.15	75
0.20	100
0.25	125
0.30	150
0.40	200
0.50	250

Practical Dosing Examples

Example 1: BPC-157 at 250 µg

Reconstitution: 5 mg vial + 5 mL BAC water = 1 mg/mL

Calculation:

Volume = 0.25 mg ÷ 1 mg/mL = 0.25 mL = 25 units

Example 2: Semaglutide at 0.25 mg

Reconstitution: 3 mg vial + 1 mL BAC water = 3 mg/mL

Calculation:

Volume = 0.25 mg ÷ 3 mg/mL = 0.083 mL ≈ 8.3 units

Example 3: CJC-1295 at 100 µg

Reconstitution: 2 mg vial + 4 mL BAC water = 0.5 mg/mL

Calculation:

Volume = 0.1 mg ÷ 0.5 mg/mL = 0.2 mL = 20 units

Example 4: Ipamorelin at 200 µg

Reconstitution: 5 mg vial + 5 mL BAC water = 1 mg/mL

Calculation:

Volume = 0.2 mg ÷ 1 mg/mL = 0.2 mL = 20 units

Syringe Specifications

Common Syringe Sizes

Syringe Volume	Graduation	Increment	Best For
0.3 mL	0.01 mL	1 unit	Low-dose peptides
0.5 mL	0.01 mL	1 unit	Most peptide doses
1.0 mL	0.01 mL	1 unit	Higher volumes

Needle Gauge Reference

Gauge	Diameter (mm)	Use Case
25G	0.50	Reconstitution (drawing)
27G	0.40	SC injection
29G	0.33	SC injection (thinner)
30G	0.30	SC injection (finest)

Needle Length

Length	Use Case
6 mm (1/4”)	Thin adults, low body fat
8 mm (5/16”)	Average adults
12.7 mm (1/2”)	Higher body fat, IM injection

Conversion Quick Reference Card

Desired Dose	From 1 mg/mL	From 2.5 mg/mL	From 0.5 mg/mL
50 µg	5 units	2 units	10 units
100 µg	10 units	4 units	20 units
150 µg	15 units	6 units	30 units
200 µg	20 units	8 units	40 units
250 µg	25 units	10 units	50 units
300 µg	30 units	12 units	60 units
500 µg	50 units	20 units	100 units
1000 µg	100 units	40 units	200 units

Common Errors

Error	Consequence	Prevention
Using U-500 as U-100	5× overdose	Check syringe label
Misreading graduation	Incorrect dose	Read at plunger seal
Drawing air bubbles	Underdose	Tap syringe, expel air
Using wrong syringe	Inaccurate measurement	Match syringe to volume
Not accounting for dead space	Slight underdose	Use low dead-space syringes

Safety Considerations

• Always verify syringe type (U-100 vs U-500)
• Use appropriate needle for injection route
• Rotate injection sites to prevent lipodystrophy
• Dispose of needles in FDA-cleared sharps container
• Never share syringes or needles

Internal Links

• Peptide Reconstitution Calculator — Calculate volumes
• Peptide Calculator Guide — All tools
• BAC Water for Peptides — Diluent preparation

External References

1. CDC. “Best Practices for Sharps Safety.” CDC 2024.
2. FDA. “Insulin Delivery Devices: Technical Considerations.” FDA 2023.