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mM to Molar

Convert mM to Molar and Molar to mM

Real‑time two-way unit conversion for molar concentration.

Decimals:
3

1 M = 1000 mM

Enter a value in any field to see all units update instantly.
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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 (divide mM by 1000 to get Molar)
  • mM = M × 1000 (multiply Molar by 1000 to get mM)
  • µM = mM × 1000 = M × 1,000,000
  • nM = µM × 1000 = mM × 1,000,000 = M × 10^9

How to use this mM to M & M to mM converter

  1. Type your known concentration in either field—convert mM to Molar or Molar to mM instantly.
  2. All other units update immediately in real‑time in both directions—no buttons needed.
  3. 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.

Learn more about millimolar (mM) →

Quick conversion chart (mM → M and µM)

mM M
0.10.0001
0.50.0005
10.001
2.50.0025
50.005
100.01
250.025
500.05
1000.1
2500.25
5000.5
10001
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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 Molar to millimolar?
Multiply by 1000: mM = M × 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.