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Nanomolar to Micromolar Converter
↔ Convert µM to nM instead

Common Conversions

nM µM
0.1 0.0001
0.5 0.0005
1 0.001
5 0.005
10 0.01
50 0.05
100 0.1
250 0.25
500 0.5
1000 1
5000 5
10000 10

Why this conversion matters in chemistry

Nanomolar is where most drug potency numbers live; micromolar is where most enzyme assays are run. So this conversion comes up almost every time you're comparing a published Ki with the concentration you're about to put on a plate. The arithmetic is just a divide by a thousand — 500 nM is 0.5 µM — but the mental translation matters more than the math. A 1 nM binder is genuinely tight; a 1 µM binder is respectable but well below the threshold for most modern drug campaigns. Getting fluent with the step makes papers faster to read.

Formula

µM = nM / 1000

Worked Examples

500 nM = 0.5 µM

A respectable Ki for a mid-stage enzyme inhibitor — enough affinity to matter, enough room left to optimize.

1 nM = 0.001 µM

The kind of Kd you see for a tuned-up kinase inhibitor or a well-raised antibody.

1000 nM = 1 µM

A clean anchor point. This is roughly where most primary screening plates sit.

10 nM = 0.01 µM

Where a lot of endogenous signaling molecules operate — receptor ligands, tight-binding peptides, that neighborhood.

Frequently Asked Questions

How do I convert nM to µM?
Divide by 1000. The relationship is exact — 1 µM is 1000 nM — so 250 nM drops straight to 0.25 µM. One of the few conversions where you really can do it in your head.
Which numbers tend to live in nM versus µM?
Nanomolar is the natural home for binding affinities (Kd, Ki), hormone concentrations, and trace analytes — anywhere the molecule is both potent and dilute. Micromolar is where you spend most of your working day: enzyme Km values, screening concentrations, typical cellular metabolites. When a paper jumps between the two it's usually because those parts of the experiment happen at different scales.
How potent is a 1 nM Kd?
That's a genuinely tight binder. A 1 nM compound saturates its target at concentrations where most other molecules wouldn't even register. For rough calibration: ibuprofen's Ki against COX-1 is in the low-µM range — three orders of magnitude weaker — while a lot of modern targeted drugs land in the 0.1 to 10 nM range.
How does nM relate to mass concentration like ng/mL?
It depends on molar mass, so you can't convert without it. The relationship is ng/mL = nM × MW / 1000. A 50 kDa protein at 1 nM works out to 50 ng/mL; a 300 Da small molecule at 1 nM is only 0.3 ng/mL. Worth keeping in mind when reading protein papers that report stocks in mg/mL — it's not always the same scale you're imagining.