Urine & CSF

Calcium (24-h urine) unit converter

Calcium excreted in 24-hour urine

Also known as: Urine calcium, 24-hour urine calcium, Urinary calcium excretion, Calciuria, Kalziurie, Calciurie

Converter

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

mmol/24 h mg/24 h

Worked example

5 mmol/24 h (middle of the reference range) = 200 mg/24 h

Conversion formulas

mg/24 h	mg/24 h = mmol/24 h × 40.08	mmol/24 h = mg/24 h × 0.02495

Reference range

Unit	Adults
mmol/24 h	2.5 – 7.5
mg/24 h	100.2 – 300.6

Source: Pathology Harmony Group (ACB, IBMS, RCPath): Agreed Adult Clinical Biochemistry Reference Intervals, January 2011 · Last reviewed: 2026-10-14

Note from the source: 2.5-7.5 mmol/24 h. UK Pathology Harmony consensus of the Association for Clinical Biochemistry, the Institute of Biomedical Science and the Royal College of Pathologists.

Frequently asked questions

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

mg/24 h = mmol/24 h × 40.08. In the other direction: mmol/24 h = mg/24 h × 0.02495.

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

For adults the range is 2.5 – 7.5 mmol/24 h (Pathology Harmony Group (ACB, IBMS, RCPath): Agreed Adult Clinical Biochemistry Reference Intervals, January 2011). Reference ranges differ between laboratories and partly by sex and age; use the range printed on your lab report.

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

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