Calculator
Example data table
| Example | Albumin | Creatinine | ACR (mg/g) | Category |
|---|---|---|---|---|
| Example 1 | 12 mg/L | 100 mg/dL | 12.00 | A1 |
| Example 2 | 45 mg/L | 90 mg/dL | 50.00 | A2 |
| Example 3 | 420 mg/L | 100 mg/dL | 420.00 | A3 |
These rows are illustrative only and help users understand how different concentration pairs affect the final ratio.
Formula used
ACR (mg/g)
ACR = Urine albumin (mg/L) ÷ Urine creatinine (g/L)
ACR (mg/mmol)
ACR = Urine albumin (mg/L) ÷ Urine creatinine (mmol/L)
Helpful conversions inside this calculator
- mg/mmol = mg/g × 0.11312
- mg/g = mg/mmol × 8.84
- Creatinine mmol/L is derived from molecular weight conversion.
- Albumin unit inputs are normalized to mg/L before calculation.
How to use this calculator
- Enter urine albumin and choose the matching albumin unit from the list.
- Enter urine creatinine and select its reported unit.
- Choose your preferred output format, either mg/g or mg/mmol.
- Optionally add patient label, date, sample type, precision, and note.
- Press Calculate ratio to display results above the form.
- Review the ACR values, category, converted inputs, chart, and export buttons.
Interpretation guide
| Category | mg/g | mg/mmol | Meaning |
|---|---|---|---|
| A1 | < 30 | < 3 | Normal to mildly increased |
| A2 | 30 to 300 | 3 to 30 | Moderately increased |
| A3 | > 300 | > 30 | Severely increased |
This page is for education and screening support. Abnormal values should be interpreted with symptoms, eGFR, repeat testing, and clinical judgment.
Frequently asked questions
1. What does the albumin creatinine ratio measure?
It compares urine albumin with urine creatinine in the same sample. This helps standardize albumin results against urine concentration and hydration differences.
2. Why is creatinine used in the denominator?
Creatinine acts as a concentration reference. Dividing albumin by creatinine makes spot urine testing more useful than albumin concentration alone.
3. What is considered a normal result?
An ACR below 30 mg/g is generally considered normal to mildly increased. Lower values are better, but context and repeat testing still matter.
4. Is mg/g the same as mg/mmol?
No. They express the same relationship using different creatinine units. This calculator shows both so you can compare laboratory reporting systems easily.
5. Can one abnormal result diagnose kidney disease?
Usually not by itself. A single abnormal value often needs repeat confirmation because exercise, infection, bleeding, or other short-term factors can change results.
6. Is a first-morning sample better?
A first-morning sample is often preferred because it may reduce random variation. However, many clinics still use random spot urine samples successfully.
7. Why does this calculator ask for unit choices?
Labs report albumin and creatinine in different units. Unit conversion helps prevent manual mistakes and keeps the final ratio consistent across reports.
8. When should I discuss the result with a clinician?
Discuss persistent abnormal results, especially A2 or A3 values, symptoms, diabetes, hypertension, pregnancy, or known kidney disease with a qualified clinician.