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Calculate your Glomerular Filtration Rate (GFR) to assess kidney function. Use CKD-EPI, MDRD, or Cockcroft-Gault formulas with instant kidney disease stage classification.
Normal Range:
Men: 0.7-1.3 mg/dL | Women: 0.6-1.1 mg/dL
This GFR calculator is an educational tool that provides estimates based on established medical formulas. It is not a substitute for professional medical advice, diagnosis, or treatment.
Always consult a qualified nephrologist or healthcare provider for:
GFR values can vary based on hydration status, medications, recent meals, and other factors. Multiple tests over time provide more accurate assessment than a single measurement.
Medical Information: This calculator uses clinically validated formulas (CKD-EPI, MDRD, Cockcroft-Gault) recommended by KDIGO (Kidney Disease: Improving Global Outcomes) guidelines. The information provided is based on established medical research and clinical practice guidelines. Always consult qualified healthcare professionals for medical advice and diagnosis.
The Glomerular Filtration Rate (GFR) is the best overall indicator of kidney function. It measures how much blood your kidneys filter each minute. The kidneys have tiny filters called glomeruli that remove waste products and excess fluid from your blood.
A normal GFR for adults is typically 90-120 mL/min/1.73m². However, GFR naturally declines with age. After age 40, GFR decreases by approximately 1 mL/min per year. A GFR below 60 for three months or more indicates chronic kidney disease (CKD).
The CKD-EPI (Chronic Kidney Disease Epidemiology Collaboration) equation from 2009 is the most accurate formula for estimating GFR. It's recommended by KDIGO (Kidney Disease: Improving Global Outcomes) guidelines. It performs better than MDRD, especially for GFR values above 60.
The MDRD (Modification of Diet in Renal Disease) equation from 1999 was widely used but tends to underestimate GFR in people with normal or near-normal kidney function. It's less accurate than CKD-EPI for GFR >60 mL/min/1.73m².
The Cockcroft-Gault equation from 1976 is the oldest formula. It estimates creatinine clearance rather than GFR and uses actual body weight. It's still used for medication dosing adjustments but is less accurate for GFR estimation.
GFR (Glomerular Filtration Rate) measures how well your kidneys filter blood. It's the best indicator of kidney function. Normal GFR is 90+ mL/min/1.73m². Lower GFR indicates reduced kidney function and potential kidney disease.
Normal GFR is 90-120 mL/min/1.73m². Stage 1 (90+) is normal with kidney damage signs. Stage 2 (60-89) is mildly reduced. Stage 3 (30-59) is moderate reduction. Stage 4 (15-29) is severe. Stage 5 (<15) is kidney failure requiring dialysis.
GFR is calculated using formulas like CKD-EPI, MDRD, or Cockcroft-Gault. These use serum creatinine, age, gender, and ethnicity. CKD-EPI is most accurate for general population. Blood test measures creatinine, then formula estimates GFR.
Low GFR is caused by diabetes, high blood pressure, glomerulonephritis, polycystic kidney disease, prolonged urinary obstruction, recurrent kidney infections, medications (NSAIDs, certain antibiotics), and aging. Chronic conditions damage kidney filters over time.
While kidney damage is often irreversible, early-stage kidney disease progression can be slowed or stabilized through lifestyle modifications. Control blood pressure and blood sugar, maintain healthy weight, exercise regularly, limit salt and protein intake, avoid NSAIDs, quit smoking, and stay hydrated. Consult your healthcare provider for personalized treatment plans.
Our GFR calculator is based on peer-reviewed medical research and clinical guidelines from leading nephrology organizations:
Comprehensive information about kidney disease, GFR, and kidney health management.
Visit kidney.org →Kidney Disease: Improving Global Outcomes - International clinical practice guidelines for CKD.
Visit kdigo.org →Evidence-based information about kidney disease, testing, and treatment options.
Visit niddk.nih.gov →Professional organization providing kidney disease education and research updates.
Visit asn-online.org →Unlike competitors, we offer CKD-EPI, MDRD, and Cockcroft-Gault formulas. Compare results across different calculation methods for comprehensive assessment.
We provide complete CKD stage breakdown (1-5) with specific recommendations for each stage. Most calculators only show GFR number without context.
Accurate ethnicity-based calculations following KDIGO guidelines. African American adjustment factor included for precise results.
Enter creatinine in mg/dL or µmol/L. Automatic conversion ensures accuracy regardless of your lab report format.
Stage-specific health recommendations and lifestyle modifications. We don't just show numbers, we guide you on next steps.
Perfect experience on mobile, tablet, and desktop. Calculator section always visible at top for easy access on all devices.
1. CKD-EPI Formula: Levey AS, Stevens LA, Schmid CH, et al. A new equation to estimate glomerular filtration rate. Ann Intern Med. 2009;150(9):604-612. doi:10.7326/0003-4819-150-9-200905050-00006
2. KDIGO Guidelines: Kidney Disease: Improving Global Outcomes (KDIGO) CKD Work Group. KDIGO 2012 Clinical Practice Guideline for the Evaluation and Management of Chronic Kidney Disease. Kidney Int Suppl. 2013;3:1-150.
3. MDRD Formula: Levey AS, Bosch JP, Lewis JB, Greene T, Rogers N, Roth D. A more accurate method to estimate glomerular filtration rate from serum creatinine: a new prediction equation. Ann Intern Med. 1999;130(6):461-470.
4. Cockcroft-Gault Formula: Cockcroft DW, Gault MH. Prediction of creatinine clearance from serum creatinine.Nephron. 1976;16(1):31-41. doi:10.1159/000180580
5. CKD Staging: National Kidney Foundation. K/DOQI clinical practice guidelines for chronic kidney disease: evaluation, classification, and stratification. Am J Kidney Dis. 2002;39(2 Suppl 1):S1-266.
Last Updated: December 24, 2024 | Medical Review: Based on current KDIGO guidelines and peer-reviewed literature