Question: what is the difference between mmol/l and umol/l?
Answer: The answer is 0.001. We assume you are converting between millimole/liter and micromole/liter. You can view more details on each measurement unit: mmol/l or umol/l The SI derived unit for amount-of-substance concentration is the mole/cubic meter. 1 mole/cubic meter is equal to 1 mmol/l, or 1000 umol/l.