Urine & CSF

Magnesium (24-h urine) unit converter

Magnesium excreted in 24-hour urine (magnesium status workup)

Converter

Enter a value in any unit and all other units fill in.

mmol/24 h mg/24 h

Worked example

4.45 mmol/24 h (middle of the reference range) = 108 mg/24 h

Conversion formulas

mg/24 h	mg/24 h = mmol/24 h × 24.31	mmol/24 h = mg/24 h × 0.04114

Good to know

Magnesium (24-h urine) is reported in mmol/24 h or mg/24 h. The page converts between the units only.

mg/24 h × 0.04114 = mmol/24 h (exact factor 0.04114).
The range shown is a guide from the named source; targets and reference ranges differ between laboratories, methods and indications, so compare with the range on your own report.

Reference range

Unit	Adults
mmol/24 h	2.4 – 6.5
mg/24 h	58.34 – 158

Source: Severn Pathology (North Bristol NHS Trust): Magnesium (24-hour urine) · Last reviewed: 2026-10-19

Note from the source: 2.4-6.5 mmol/24 h (Severn Pathology); depends on diet

Frequently asked questions

How do I convert Magnesium (24-h urine) from mmol/24 h to mg/24 h?

mg/24 h = mmol/24 h × 24.31. In the other direction: mmol/24 h = mg/24 h × 0.04114.

What is the reference range of Magnesium (24-h urine)?

For adults the range is 2.4 – 6.5 mmol/24 h (Severn Pathology (North Bristol NHS Trust): Magnesium (24-hour urine)). Reference ranges differ between laboratories and partly by sex and age; use the range printed on your lab report.

Which units are used for Magnesium (24-h urine)?

Common units are mmol/24 h, mg/24 h.