Albumin Creatinine Ratio Calculator

The urine albumin-to-creatinine ratio, or ACR, estimates albumin loss in urine while accounting for urine concentration. Albumin is a blood protein that healthy kidneys largely retain. Creatinine is released at a relatively steady rate and provides a practical denominator for a spot urine sample. Dividing albumin concentration by creatinine concentration can detect abnormal albumin excretion without requiring a timed 24-hour collection. Laboratories commonly report ACR as milligrams of albumin per gram of creatinine in the United States or milligrams per millimole in SI-based systems. This calculator converts the selected input units and displays both formats. An ACR below 30 mg/g, or below about 3 mg/mmol, is generally categorized as normal to mildly increased. A result from 30 through 300 mg/g is moderately increased, and a result above 300 mg/g is severely increased. Boundaries and reporting conventions may vary slightly. Sex-specific thresholds may also be used in some clinical guidance. Persistent albuminuria can be a marker of kidney damage and is important in diabetes, hypertension, cardiovascular risk assessment, and chronic kidney disease staging. However, one elevated sample is not enough to establish chronic kidney disease. Exercise, fever, urinary tract infection, menstruation, marked hyperglycemia, uncontrolled blood pressure, and acute illness can temporarily increase urine albumin. Hydration and muscle mass can also influence concentrations. Monitoring trends can be more informative than comparing isolated values that were collected under different conditions. Clinicians often prefer a first-morning specimen and repeat an abnormal result to confirm persistence. ACR should be interpreted with estimated glomerular filtration rate, urinalysis, medical history, medications, and other findings. Very low urine creatinine can produce an unusually high ratio and may indicate a dilute or unsuitable sample. Ensure albumin and creatinine come from the same specimen and that units are entered exactly as reported. This calculator is an educational conversion and arithmetic aid, not a diagnosis. Discuss abnormal results with a qualified clinician, especially when accompanied by swelling, reduced urine output, blood in urine, or other concerning symptoms.