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100 units to mg

Units and mL measure volume, mg and mcg measure amount, so the conversion depends on how concentrated the vial is. The answer below states the vial and water it assumes; change them in the converter.

Medically reviewed by Juan Pablo Frías, MD · · DisclosureUpdated Educational use only
100 units =
5mg
in 100 units (U-100) at 5 mg/mL (10 mg + 2 mL water)Shown on a 1 mL (100-unit) U-100 syringe: 100 units = 1 mL.

The working

10 mg ÷ 2 mL = 5 mg/mL100 units ÷ 100 = 1 mL1 mL × 5 mg/mL = 5 mg

This uses 10 mg + 2 mL of bacteriostatic water as an example. Your vial label and the water you added decide the real answer.

Math only. It does not recommend a dose.

Convert another amount (units to mg)

units
mg
mL
Syringe scale
Result
5mg
10 mg ÷ 2 mL = 5 mg/mL100 units ÷ 100 = 1 mL1 mL × 5 mg/mL = 5 mg

units to mg: nearby values

Each column is a different concentration (vial mg ÷ water mL). The highlighted row is 100 units.

units to mg by concentration (U-100 unless stated)
units2.5 mg/mL5 mg + 2 mL5 mg/mL10 mg + 2 mL · used above10 mg/mL20 mg + 2 mL20 mg/mL60 mg + 3 mL
5 units0.1250.250.51
10 units0.250.512
15 units0.3750.751.53
20 units0.5124
25 units0.6251.252.55
30 units0.751.536
40 units1248
50 units1.252.5510
60 units1.53612
80 units24816
100 units2.551020

More conversions

Units to mg
5 units10 units20 units25 units30 units40 units50 units100 units
100 mcg to mg100 mcg to units100 units to mL0.25 mg to units0.5 mg to units1 mg to unitsPeptide reconstitution calculatorVial, water and dose to unitsAll convertersmcg, mg, mL and units

Sources

  1. 1Metric (SI) Prefixes (NIST Reference on Constants, Units, and Uncertainty)National Institute of Standards and Technology (NIST) · 2025physics.nist.govAccessed 2 Oct 2026
  2. 2BASAGLAR (insulin glargine) injection, prescribing information (DailyMed)U.S. Food and Drug Administration / DailyMed (Eli Lilly and Company label) · 2026dailymed.nlm.nih.govAccessed 2 Oct 2026

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