Urine & CSF

Oxalate (24-h urine) unit converter

Oxalate excreted in 24-hour urine (kidney stone work-up)

Also known as: Urinary oxalate, Oxalat im Urin, Oxalate urine 24h

Converter

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

mmol/24 h mg/24 h

Worked example

0.265 mmol/24 h (middle of the reference range) = 23.3 mg/24 h

Conversion formulas

mg/24 h	mg/24 h = mmol/24 h × 88.02	mmol/24 h = mg/24 h × 0.01136

Good to know

Oxalate in 24-hour urine is reported in mmol/24 h or in mg/24 h.

mg/24 h × 0.0114 = mmol/24 h (exact factor 0.011361).
Collect into an acidified container and avoid large amounts of vitamin C and oxalate-rich food before the test.

Reference range

Unit	Adults	Men	Women
mmol/24 h	0.04 – 0.49	0.08 – 0.49	0.04 – 0.32
mg/24 h	3.521 – 43.13	7.042 – 43.13	3.521 – 28.17

Source: Newcastle Hospitals Laboratories: Oxalate, urine · Last reviewed: 2026-10-19

Note from the source: Adult men 0.08-0.49 mmol/24 h, women 0.04-0.32 mmol/24 h (children 0.14-0.42) (Newcastle Hospitals Laboratories). Expressed as oxalate anion (88.02 g/mol). Collect into an acidified container

Frequently asked questions

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

mg/24 h = mmol/24 h × 88.02. In the other direction: mmol/24 h = mg/24 h × 0.01136.

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

For adults the range is 0.04 – 0.49 mmol/24 h (Newcastle Hospitals Laboratories: Oxalate, 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 Oxalate (24-h urine)?

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