Kidney Health and CKD Risk Calculator

Q: What is a normal eGFR level?

A normal eGFR for a healthy adult is typically 90 mL/min/1.73m² or higher. However, eGFR naturally decreases slightly with age even in healthy individuals.

Q: Can eGFR be higher than 100%?

Mathematically, yes, but for clinical purposes, anything over 90% is considered normal function. This calculator caps the "Percentage" display at 100% for clarity.

Q: Why is race no longer used in the eGFR formula?

The medical community (NKF and ASN) updated the guidelines in 2021 to remove race as a variable, ensuring more equitable and accurate care for all patients regardless of background.

Q: What is Urine ACR?

Urine Albumin-to-Creatinine Ratio (ACR) measures how much protein is leaking into your urine. It is a key marker for early kidney damage from diabetes or hypertension.

Q: What should I do if my results show high risk?

A single high creatinine or low eGFR result does not always mean you have kidney disease. Results should be confirmed over 3 months. See a doctor to discuss these results and potentially repeat the test.

Q: How do I add this Kidney Health and CKD Risk Calculator to my site?

Absolutely. Use the "Embed" option above to tailor the dimensions, color scheme, and styling to match your site. Copy the generated iframe snippet and drop it into your HTML, WordPress editor, or any CMS. There is no cost and no account required. See calculory.com/services/embed-calculators for a step-by-step walkthrough.

Estimate your kidney function percentage (eGFR) and identify Chronic Kidney Disease (CKD) risk level using the 2021 CKD-EPI formula. Combine serum creatinine, age, and urine ACR for a complete assessment.

Enter Values

Age (years)

Gender

Serum Creatinine (mg/dL)

Urine Albumin/Creatinine (mg/g)

Result

Enter values above and click Calculate to see your result.

AI Assistant

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Our AI assistant provides general estimates and advice only. Please consult a qualified healthcare professional before making any health-related decisions.

Formula

Core Formula

eGFR = 142 \times \min\!\left(\frac{S_{cr}}{\kappa},\, 1\right)^{\!\alpha} \times \max\!\left(\frac{S_{cr}}{\kappa},\, 1\right)^{\!-1.200} \\ \times \; 0.9938^{\text{Age}} \times [1.012 \text{ if female}]

How it works: Uses the 2021 CKD-EPI creatinine equation to estimate Glomerular Filtration Rate (eGFR), which represents your kidney function percentage.

Worked Example

Age 45, Male, Creatinine 1.0 mg/dL -> eGFR 102 mL/min/1.73m² (100% function).

How Kidney Health is Measured

Kidney health is primarily measured by the estimated Glomerular Filtration Rate (eGFR), which tells us how well your kidneys filter waste. This value is often referred to as your kidney function percentage.

90% to 100%: Normal kidney function
60% to 89%: Mildly decreased function (Stage G2)
30% to 59%: Moderate damage (Stage G3a/G3b)
15% to 29%: Severe damage (Stage G4)
Below 15%: Kidney failure (Stage G5)
Albuminuria (protein in urine) is an early marker of damage even if eGFR is normal
The 2021 CKD-EPI equation is the most accurate formula for adults as it removes race-based bias

Early detection of kidney disease is critical because it is often "silent" until late stages. If your risk is moderate or high, consult a healthcare provider for further testing.

You can also calculate changes using our HbA1c to eAG Calculator, Blood Sugar Conversion Calculator or Corrected Calcium Calculator.

KDIGO CKD Risk Heat Map

The risk of CKD progression and cardiovascular events based on eGFR (G-Stage) and Albuminuria (A-Stage).

GFR Stage	eGFR Range	A1 (<30)	A2 (30-300)	A3 (>300)
G1	≥90	Low	Moderate	High
G2	60-89	Low	Moderate	High
G3a	45-59	Moderate	High	Very High
G3b	30-44	High	Very High	Very High
G4	15-29	Very High	Very High	Very High
G5	<15	Very High	Very High	Very High

Note: Risk classifications are based on KDIGO 2024 Clinical Practice Guidelines. High-risk categories indicate a higher likelihood of progression to kidney failure or cardiovascular complications.

Frequently Asked Questions

What is a normal eGFR level?

A normal eGFR for a healthy adult is typically 90 mL/min/1.73m² or higher. However, eGFR naturally decreases slightly with age even in healthy individuals.

Can eGFR be higher than 100%?

Mathematically, yes, but for clinical purposes, anything over 90% is considered normal function. This calculator caps the "Percentage" display at 100% for clarity.

Why is race no longer used in the eGFR formula?

The medical community (NKF and ASN) updated the guidelines in 2021 to remove race as a variable, ensuring more equitable and accurate care for all patients regardless of background.

What is Urine ACR?

Urine Albumin-to-Creatinine Ratio (ACR) measures how much protein is leaking into your urine. It is a key marker for early kidney damage from diabetes or hypertension.

What should I do if my results show high risk?

A single high creatinine or low eGFR result does not always mean you have kidney disease. Results should be confirmed over 3 months. See a doctor to discuss these results and potentially repeat the test.

How do I add this Kidney Health and CKD Risk Calculator to my site?

Absolutely. Use the "Embed" option above to tailor the dimensions, color scheme, and styling to match your site. Copy the generated iframe snippet and drop it into your HTML, WordPress editor, or any CMS. There is no cost and no account required. See calculory.com/services/embed-calculators for a step-by-step walkthrough.

Medical Disclaimer

This calculator is provided for informational and educational purposes only. It is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making any decisions based on these results. Do not disregard or delay seeking medical advice because of information obtained from this tool.

AI Assistant

Ask about this calculator

I can help you understand the kidney health and ckd risk calculator formula, interpret your results, and answer follow-up questions.

Try asking

Our AI assistant provides general estimates and advice only. Please consult a qualified healthcare professional before making any health-related decisions.

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