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