eGFR (estimated Glomerular Filtration Rate) is a calculated measure of how much blood your kidneys filter per minute per 1.73 m² of body surface area. A normal eGFR is 60 or above; values below 60 for 3+ months indicate chronic kidney disease.

Why does the 2021 CKD-EPI equation not use race?

Earlier equations included a race multiplier for Black patients that has been shown to introduce systematic bias and worsen health equity. The 2021 update by the NKF-ASN Task Force removed the race variable while maintaining predictive accuracy.

What creatinine units should I use?

US labs typically report creatinine in mg/dL; international labs often use µmol/L. Select the matching unit — the calculator converts µmol/L to mg/dL automatically (divide by 88.42) before applying the formula.

Can I use this for children under 18?

No. The CKD-EPI equation is validated only for adults aged 18 and older. For pediatric eGFR, the Schwartz or Bedside Schwartz equations should be used instead.

What do the CKD stages mean?

G1 (≥90): normal or high; G2 (60–89): mildly decreased; G3a (45–59): mild-to-moderate decrease; G3b (30–44): moderate-to-severe; G4 (15–29): severely decreased; G5 (<15): kidney failure. Staging also requires albuminuria assessment for full KDIGO classification.

Is this calculator a substitute for medical advice?

No. This tool is for educational and informational purposes only. Always consult a qualified healthcare provider for diagnosis, treatment decisions, and interpretation of lab results.

eGFR Calculator

Name: eGFR Calculator
Availability: InStock
Author: Nham Vu

Enter age, sex, and serum creatinine to calculate eGFR and determine your chronic kidney disease stage using the CKD-EPI 2021 equation.

Patient Details

Age (years)

Biological Sex

Male Female

Serum Creatinine

Uses the CKD-EPI 2021 creatinine equation (race-free). For adults aged 18+. Not a substitute for professional medical advice.

Fill in the details on the left and click Calculate eGFR.

Results will appear here.

KDIGO CKD Staging Reference

Based on eGFR alone; full staging also incorporates albuminuria (A1–A3).

Stage	eGFR (mL/min/1.73 m²)	Description	Typical Action
G1	≥90	Normal or high	Treat risk factors; monitor annually
G2	60–89	Mildly decreased	Monitor annually; address risk factors
G3a	45–59	Mild-to-moderate decrease	Review medications; monitor every 6 months
G3b	30–44	Moderate-to-severe decrease	Nephrology referral; dose-adjust drugs
G4	15–29	Severely decreased	Prepare for renal replacement therapy
G5	<15	Kidney failure	Dialysis or transplantation consideration

Summary

Enter age, sex, and serum creatinine to calculate eGFR and determine your chronic kidney disease stage using the CKD-EPI 2021 equation.

How it works

Enter the patient's age in years (18 or older).
Select biological sex (male or female) — the equation uses different coefficients for each.
Enter the serum creatinine value; toggle between mg/dL and µmol/L as needed.
Click Calculate eGFR to compute the result using the 2021 CKD-EPI formula.
The tool displays your eGFR value and maps it to the matching KDIGO CKD stage with a description.

Use cases

Assess kidney function from a routine blood test creatinine result.
Stage chronic kidney disease (CKD) according to KDIGO G1–G5 guidelines.
Monitor eGFR trends over time for patients with diabetes or hypertension.
Determine whether drug dose adjustments are required based on renal function.
Screen for early kidney disease before symptoms appear.
Educate patients about what their lab creatinine value means in clinical terms.
Support clinical decision-making in primary care and nephrology settings.
Convert serum creatinine from µmol/L to an eGFR without manual math.

Frequently Asked Questions

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Last updated: 2026-05-23 · Reviewed by Nham Vu