GFR Calculator – Glomerular Filtration Rate Online

GFR Calculator: Glomerular Filtration Rate & CKD Stages

Core Idea: This calculator estimates your Glomerular Filtration Rate (GFR) using MDRD, CKD-EPI, Mayo Quadratic (adults), and Schwartz (children) formulas to assess kidney function and CKD stage.

How It Works: Enter your age, gender, race, serum creatinine, and (for children) height. The tool applies standard equations: MDRD, CKD-EPI, Mayo Quadratic, and Schwartz. Results are rounded for display only.

Sanity Checks: Ensure your creatinine and height values are within normal ranges. Double-check units (mg/dL or µmol/L). For children, use accurate height in cm or inches.

Shortcuts: For adults, use MDRD or CKD-EPI for most cases. For children, use Schwartz. If unsure, consult your doctor for the best formula for your situation.

Pitfalls: Incorrect units or out-of-range values can give misleading results. GFR formulas are estimates and may not reflect all health conditions. Always consult a healthcare provider for diagnosis.

Micro-examples: Adult, 40y, male, 1.0 mg/dL: MDRD ≈ 90.6. Child, 10y, 120cm, 1.0 mg/dL: Schwartz ≈ 49.6.

Mini-FAQ:

What is GFR? A measure of kidney filtering capacity.
What is a normal GFR? 90+ mL/min/1.73m².
What are CKD stages? Stage 1: ≥90, 2: 60–89, 3: 30–59, 4: 15–29, 5: <15.

Action Tip: Use this tool to monitor kidney health and share results with your doctor. Always interpret GFR in context of your overall health.