How do you convert mM to µM?

Multiply the value in mM by 1000 to get µM. Formula: µM = mM × 1000.

Convert mM ↔ M (and µM)

Real‑time unit conversion for molar concentration.

Decimals:

Millimolar (mM)

1 M = 1000 mM

Molar (M)

Enter a value in any field to see all units update instantly.

How the mM → M conversion works

These units are powers of ten: 1 M (molar) is 1000 mM (millimolar), and 1 mM is 1000 µM (micromolar). The converter uses these exact factors with no rounding except what you choose in the Decimals control:

M = mM ÷ 1000
mM = M × 1000
µM = mM × 1000 = M × 1,000,000
nM = µM × 1000 = mM × 1,000,000 = M × 10^9

How to use this mM ↔ M converter

Type your known concentration in any one field (µM, mM, M, or nM).
All other units update immediately in real‑time—no buttons needed.
Adjust Decimals to format the numbers for reports or notes.

molar, millimolar, micromolar — what do they mean?

Molarity (M) is moles per liter (mol·L⁻¹). Its decimal multiples and submultiples are widely used in chemistry and biology:

1 M = 10³ mM
1 mM = 10⁻³ M
1 µM = 10⁻⁶ M

1 mM = 10³ µM
1 µM = 10³ nM
1 nM = 10⁻⁹ M

Because these are exact powers of 10, conversions are simple multiply/divide by 10ⁿ. This tool keeps internal values exact and only rounds for display.

Quick conversion chart (mM → M and µM)

mM	M
0.1	0.0001
0.5	0.0005
1	0.001
2.5	0.0025
5	0.005
10	0.01
25	0.025
50	0.05
100	0.1
250	0.25
500	0.5
1000	1

FAQs

How many mM is 1 molar?

1 M = 1000 mM.

How do you convert mM to molar?

Divide by 1000: M = mM ÷ 1000.

How do you convert mM to µ?

If \"µ\" means micromolar (µM), multiply by 1000: µM = mM × 1000.

How to change 1 mM to 1 M?

Numerically, you can’t—1 mM equals 0.001 M. To obtain a 1 M solution you’d need a 1000× stronger stock (or concentrate/evaporate), which is a lab preparation step, not a conversion.