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1 mg 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
1 mg =
20units
on a U-100 syringe at 5 mg/mL (10 mg + 2 mL water)Shown on a 0.3 mL (30-unit) U-100 syringe: 20 units = 0.2 mL.

The working

10 mg ÷ 2 mL = 5 mg/mL1 mg ÷ 5 mg/mL = 0.2 mL0.2 mL × 100 = 20 units

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 (mg to units)

mg
mg
mL
Syringe scale
Result
20units
10 mg ÷ 2 mL = 5 mg/mL1 mg ÷ 5 mg/mL = 0.2 mL0.2 mL × 100 = 20 units

mg to units: nearby values

Each column is a different concentration (vial mg ÷ water mL). The highlighted row is 1 mg.

mg to units by concentration (U-100 unless stated)
mg2.5 mg/mL5 mg + 2 mL5 mg/mL10 mg + 2 mL · used above10 mg/mL20 mg + 2 mL20 mg/mL60 mg + 3 mL
0.25 mg1052.51.25
0.5 mg201052.5
1 mg4020105
2 mg80402010
2.5 mg100502512.5
5 mg200*1005025
7.5 mg300*150*7537.5
10 mg400*200*10050
15 mg600*300*150*75
20 mg800*400*200*100
* More than a 1 mL (100-unit) syringe holds.

More conversions

mg to units
0.25 mg0.5 mg1 mg2 mg2.5 mg5 mg10 mg20 mg
1 mg to mcg1 mL to units1 mg to mL5 units to mg10 units to mg20 units to mgPeptide 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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