Albumin in the urine is an early sign of kidney damage from diabetes or high blood pressure, and it predicts heart disease too. A spot ACR avoids a 24-hour urine collection. KDIGO combines the ACR category with the GFR category to grade CKD risk.
How to use the Albumin to Creatinine Ratio Calculator
- Urine albumin
- Urine creatinine
Results update as you type, and every field accepts the units shown in its menu.
How it works
Enter the urine albumin and creatinine from the same sample. An abnormal result should be confirmed in 2 of 3 samples over 3–6 months.
Albuminuria categories (KDIGO)
| Category | mg/g | mg/mmol | Description |
|---|---|---|---|
| A1 | below 30 | below 3 | Normal to mildly increased |
| A2 | 30–300 | 3–30 | Moderately increased |
| A3 | above 300 | above 30 | Severely increased |
Inputs explained
| Field | What to enter |
|---|---|
| Urine albumin | Units: mg/dL, mg/L |
| Urine creatinine | Units: mg/dL, mmol/L |
What each result means
- ACR = [Urine albumin]÷[Urine creatinine]×1000
- ACR in mg/mmol = [ACR]÷8.84
Health note: this calculator is for education and screening only and is not a diagnosis or treatment advice. Discuss your results with a qualified clinician.
Formula
ACR (mg/g) = urine albumin (mg/dL) ÷ urine creatinine (mg/dL) × 1000
mg/mmol = mg/g ÷ 8.84
A1 < 30 mg/g · A2 30–300 mg/g · A3 > 300 mg/g
Worked example
Inputs — Urine albumin: 4 mg/dL; Urine creatinine: 100 mg/dL.
Results — ACR = 40 mg/g; ACR in mg/mmol = 4.5 mg/mmol.
Key terms
- Albuminuria
- Albumin in the urine.
Frequently asked questions
What is a normal ACR?
Below 30 mg/g (3 mg/mmol).
What raises ACR temporarily?
Exercise, fever, infection, high blood sugar and menstruation.
Why is ACR important in diabetes?
It is the earliest sign of diabetic kidney disease; yearly testing is recommended.