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100 mcg to units

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 mcg =
4units
on a U-100 syringe at 2.5 mg/mL (5 mg + 2 mL water)Shown on a 0.3 mL (30-unit) U-100 syringe: 4 units = 0.04 mL.

The working

5 mg ÷ 2 mL = 2.5 mg/mL100 mcg ÷ 1,000 = 0.1 mg0.1 mg ÷ 2.5 mg/mL = 0.04 mL0.04 mL × 100 = 4 units

This uses 5 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 (mcg to units)

mcg
mg
mL
Syringe scale
Result
4units
5 mg ÷ 2 mL = 2.5 mg/mL100 mcg ÷ 1,000 = 0.1 mg0.1 mg ÷ 2.5 mg/mL = 0.04 mL0.04 mL × 100 = 4 units

mcg to units: nearby values

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

mcg to units by concentration (U-100 unless stated)
mcg1 mg/mL2 mg + 2 mL2.5 mg/mL5 mg + 2 mL · used above5 mg/mL10 mg + 2 mL
50 mcg521
100 mcg1042
200 mcg2084
250 mcg25105
300 mcg30126
500 mcg502010
750 mcg753015
1,000 mcg1004020
1,500 mcg150*6030
2,000 mcg200*8040
* More than a 1 mL (100-unit) syringe holds.

More conversions

mcg to units
100 mcg250 mcg500 mcg1,000 mcg
100 mcg to mg100 units to mg100 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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