Micromolar to Millimolar Converter

Molar Concentration Converter

8 units available

Decimals:

From

To

0.001

1 µM = 0.001 mM

Formula:

mM = µM × 0.001

With your value: 1 µM = 0.001 mM

Other Micromolar to Millimolar conversions

2 µM to mM 3 µM to mM 4 µM to mM 5 µM to mM 6 µM to mM 7 µM to mM 8 µM to mM

Micromolar to Millimolar Conversion Table

Micromolar (µM)	Millimolar (mM)
0.5	0.0005
1	0.001
2	0.002
5	0.005
10	0.01
15	0.015
20	0.02
25	0.025
50	0.05
100	0.1
250	0.25
500	0.5
1000	1

Millimolar to Micromolar Conversion Table

Millimolar (mM)	Micromolar (µM)
0.5	500
1	1,000
2	2,000
5	5,000
10	10,000
15	15,000
20	20,000
25	25,000
50	50,000
100	100,000
250	250,000
500	500,000
1000	1,000,000

Where these values come from

Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.

Micromolar (µM)

Molar Concentration

Exact conversion

Derived from the mole, defined by fixing the Avogadro constant at 6.022 140 76 × 10²³ mol⁻¹, divided by a defined volume.

Source: BIPM, The International System of Units (SI), 9th edition, 2019 (updated 2024)

Bureau International des Poids et Mesures · Reviewed 2026-07-01

Millimolar (mM)

Molar Concentration

Exact conversion

Derived from the mole, defined by fixing the Avogadro constant at 6.022 140 76 × 10²³ mol⁻¹, divided by a defined volume.

Source: BIPM, The International System of Units (SI), 9th edition, 2019 (updated 2024)

Bureau International des Poids et Mesures · Reviewed 2026-07-01

How to Convert Micromolar to Millimolar

To convert from Micromolar (µM) to Millimolar (mM), multiply the value by 0.001.

Formula: mM = µM × 0.001

Reverse: µM = mM × 1,000

Step-by-Step Example

Start with your value in Micromolar. For example: 5 µM
Multiply by the conversion factor: 5 x 0.001
The result is: 0.005 mM

About Micromolar

The micromolar (µM) is a unit of molar concentration. One micromolar equals 0.001 base units. UnitConvertLab converts it against every other molar concentration unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

Common uses: molar concentration calculations, engineering and science, education.

About Millimolar

The millimolar (mM) is a unit of molar concentration. One millimolar equals 1 base unit. UnitConvertLab converts it against every other molar concentration unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

Common uses: molar concentration calculations, engineering and science, education.

Frequently Asked Questions

How many Millimolar are in 1 Micromolar?

There are exactly 0.001 Millimolar in 1 Micromolar. This means the conversion factor from Micromolar to Millimolar is 0.001.

What is the formula to convert Micromolar to Millimolar?

The formula to convert Micromolar to Millimolar is: mM = µM × 0.001. For example, to convert 10 Micromolar to Millimolar, you would multiply 10 by 0.001.

What is a Micromolar?