Urine albumin-to-creatinine ratio (ACR) mg/g → mg/mmol

Convert urine albumin-to-creatinine ratio (acr) from mg/g to mg/mmol

Sources last checked: 2026-11-03

Urine albumin-to-creatinine ratio (ACR) mg/g → mg/mmol

Convert urine albumin-to-creatinine ratio (acr) from mg/g to mg/mmol

Urine albumin-to-creatinine ratio (ACR) (mg/g)

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Converts units only; reference ranges depend on the laboratory, the assay and the patient.

Source: KDIGO 2024 Clinical Practice Guideline for the Evaluation and Management of Chronic Kidney Disease. Kidney Int 2024;105(4S):S117–S314 — albuminuria categories given in mg/g and mg/mmol.Open

What is the Urine albumin-to-creatinine ratio (ACR) mg/g → mg/mmol?

The urine albumin-to-creatinine ratio (ACR) is usually reported in mg/g in the USA and Turkey and by many laboratories in Germany and Austria, and in mg/mmol in the UK and many other SI-based laboratories. Converting changes only the creatinine denominator from grams to millimoles: with a molar mass of creatinine of 113.12 g/mol, 1 g of creatinine is 8.84 mmol, so mg/mmol = mg/g ÷ 8.84.

When to use it

Placing a mg/g result into albuminuria categories quoted in mg/mmol
Reading UK or other SI-based studies and guidelines after a result in mg/g
Comparing serial ACR values after a change of laboratory
Entering a value into a risk tool that expects mg/mmol

When not to use it

Protein-to-creatinine ratio (PCR) — it converts with the same factor but measures total protein, so ACR and PCR are not interchangeable
Urine albumin concentration alone (mg/L), which has no creatinine denominator
24-hour albumin excretion in mg/day, a different quantity

How it is calculated

ACR (mg/mmol) = ACR (mg/g) ÷ 8.84

Clinical pearls and limitations

Converts units only; reference ranges depend on the laboratory, the assay and the patient.
mg/mmol = mg/g ÷ 8.84; only the creatinine unit changes, albumin stays in mg.
KDIGO and other guidelines give their albuminuria categories in both mg/g and mg/mmol; read the column that matches the report instead of converting thresholds from memory.
A single raised ACR can be transient (exercise, fever, urinary tract infection, menstruation, marked hyperglycaemia); guidelines ask for confirmation on repeat samples.
A first-morning spot sample is preferred. The ratio assumes average creatinine excretion, so it overestimates albumin excretion when muscle mass is low and underestimates it when muscle mass is high.

Frequently asked questions

How do I convert ACR from mg/g to mg/mmol?

Divide by 8.84. Example: 70 mg/g ÷ 8.84 = 7.9 mg/mmol; 450 mg/g ÷ 8.84 = 50.9 mg/mmol.

Where does the factor 8.84 come from?

Creatinine has a molar mass of 113.12 g/mol, so 1 g of creatinine is 1000 ÷ 113.12 = 8.84 mmol. Dividing by 8.84 expresses the same amount of albumin per millimole instead of per gram of creatinine.

Is a spot ACR as good as a 24-hour urine collection?

For screening and follow-up, guidelines generally accept a spot ACR, ideally from a first-morning sample, because it is simpler and avoids collection errors. A timed collection may still be chosen when muscle mass is very unusual or precise excretion matters.

Evidence and guidelines

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