Micromolar Converter (µM to mM and µM to M)

This free micromolar converter turns µM into mM, M or nM (and back) as you type. Remember that 1 mM = 1,000 µM and 1 µM = 0.000001 M, so every conversion is just a shift by a power of ten.

µM ↔ mM ↔ M ↔ nM

Type a value, pick your units. Results update instantly.

Decimals:

Value

Result

Micromolar (µM): —
Millimolar (mM): —
Molar (M): —
Nanomolar (nM): —

Enter a value to see it in µM, mM, M and nM instantly.

How to Convert Micromolar to Millimolar and Molar

Micromolar (µM) means micromoles per liter. One micromolar is one millionth of a molar: 1 µM = 10⁻⁶ M. Because µM, mM and M are all decimal steps of the same unit, you only ever multiply or divide by 1,000 or 1,000,000:

µM to mM: divide by 1,000. mM = µM ÷ 1,000
mM to µM: multiply by 1,000. µM = mM × 1,000
µM to M: divide by 1,000,000. M = µM ÷ 1,000,000
M to µM: multiply by 1,000,000. µM = M × 1,000,000

If you only need to go between millimolar and molar, our mM to molar converter handles that directly.

Micromolar Conversion Chart

Micromolar (µM)	Millimolar (mM)	Molar (M)
1 µM	0.001 mM	0.000001 M
10 µM	0.01 mM	0.00001 M
50 µM	0.05 mM	0.00005 M
100 µM	0.1 mM	0.0001 M
500 µM	0.5 mM	0.0005 M
1,000 µM	1 mM	0.001 M
10,000 µM	10 mM	0.01 M

Worked Examples

Example 1: Convert 250 µM to mM

250 ÷ 1,000 = 0.25 mM

Example 2: Convert 0.5 mM to µM

0.5 × 1,000 = 500 µM

Example 3: Convert 75 µM to M

75 ÷ 1,000,000 = 0.000075 M (7.5 × 10⁻⁵ M)

Micromolar vs Millimolar vs Molar

All three units describe the same thing, moles of solute per liter, just at different scales. Molar (M) is typically used for concentrated stock solutions such as acids, bases and salt stocks. Millimolar (mM) is the everyday unit for buffers and many common reagents. Micromolar (µM) is where typical working concentrations of drugs, inhibitors and signaling molecules usually fall. When you dilute a stock down to a working solution, you'll often move from M to mM to µM, and the molar to mM converter plus this page cover every step.

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Frequently Asked Questions

How many micromolar are in a millimolar?

1,000 µM = 1 mM.

How do you convert micromolar to molar?

Divide the µM value by 1,000,000. Example: 100 µM = 0.0001 M.

How do you convert millimolar to micromolar?

Multiply the mM value by 1,000.

Is µM the same as uM?

Yes. uM is just the plain-keyboard way of typing µM when the micro symbol isn't available.

What is the difference between micromolar and micromole?

Micromolar (µM) is a concentration, micromoles per liter. A micromole (µmol) is an amount of substance. Read more: millimolar vs millimole.

Convert mM to Molar → What is millimolar? →