Gfr Calculator
Estimate glomerular filtration rate using CKD-EPI, MDRD, and Cockcroft-Gault equations. Enter values for instant results with step-by-step formulas.
Reviewed by Rahul Singh, Health & Wellness Specialist
Formula
Cockcroft-Gault: CrCl = [(140-age) x weight(kg)] / [72 x Scr] x 0.85 if female | CKD-EPI 2021 (race-free)
Cockcroft-Gault estimates creatinine clearance. CKD-EPI 2021 is the current standard for eGFR. Stages: >90 normal, 60-89 mild decrease, 30-59 moderate, 15-29 severe, <15 kidney failure.
Worked Examples
Example 1: 50yr male, Scr 1.0
Problem:Creatinine 1.0, age 50, male, 70kg
Solution:CKD-EPI: ~93 mL/min/1.73m². CG: (140-50)x70/(72x1.0) = 87.5
Result:eGFR ~93 — Normal kidney function
Frequently Asked Questions
How is GFR estimated and what does it indicate?
Glomerular Filtration Rate estimates kidney function. The CKD-EPI equation uses creatinine, age, and sex. Normal GFR is above 90 mL/min/1.73m^2. Stages: 60-89 (mild decrease), 30-59 (moderate), 15-29 (severe), below 15 (kidney failure). GFR guides medication dose adjustments for renally-cleared drugs.
Reviewed by Rahul Singh, Health & Wellness Specialist · Editorial policy