🧮 CKD Stage & Risk Prognosis Calculator
Enter eGFR and ACR values to determine stage and prognosis risk category.
What this calculator does
It places two kidney test results on the KDIGO 2012 “heat map”, the grid doctors use to describe chronic kidney disease (CKD) and its risk. The two results are:
- eGFR (filtration), from a blood test. If you only have creatinine, work it out first with the eGFR calculator.
- Urine albumin-to-creatinine ratio (ACR) in mg/g, from a urine sample. If your report shows mg/mmol, multiply by 8.84 (3 mg/mmol ≈ 30 mg/g).
The categories
- G1 ≥90 · G2 60–89 · G3a 45–59 · G3b 30–44 · G4 15–29 · G5 <15 mL/min/1.73 m²
- A1 below 30 mg/g (normal to mildly increased) · A2 30–300 mg/g (moderately increased) · A3 above 300 mg/g (severely increased)
Reading the risk colour
KDIGO combines the two into four risk levels: low (green), moderately increased (yellow), high (orange) and very high (red). The risk refers to kidney function getting worse, kidney failure, and heart and blood-vessel problems. Higher albumin raises risk even when eGFR is normal.
G1 or G2 with A1 is not CKD unless there is another sign of kidney damage (for example blood in the urine or an abnormal scan).
Important limits
- CKD is only diagnosed when abnormal results last at least 3 months. A single test can be raised by infection, fever, heavy exercise, a period or high blood sugar.
- ACR is usually repeated: two of three samples should be raised before albuminuria is confirmed.
- Treatment, diet and follow-up are decided by your doctor based on the cause of kidney disease and your other conditions.
Educational estimate only. Please discuss your results with your doctor.