GFR Calculator
Calculate estimated Glomerular Filtration Rate (eGFR) to assess kidney function using the CKD-EPI equation.
CKD-EPI Formula (most accurate):
GFR = 141 × min(Cr/κ, 1)^α × max(Cr/κ, 1)^-1.209 × 0.993^Age × K
Where:
• Cr = Serum creatinine (mg/dL)
• κ = 0.7 (female) or 0.9 (male)
• α = -0.329 (female) or -0.411 (male)
• K = 1.018 (female) or 1.0 (male)
GFR Stages:
• ≥90: Normal
• 60-89: Mild decrease
• 30-59: Moderate decrease
• 15-29: Severe decrease
• <15: Kidney failure
GFR = 141 × min(Cr/κ, 1)^α × max(Cr/κ, 1)^-1.209 × 0.993^Age × K
Where:
• Cr = Serum creatinine (mg/dL)
• κ = 0.7 (female) or 0.9 (male)
• α = -0.329 (female) or -0.411 (male)
• K = 1.018 (female) or 1.0 (male)
GFR Stages:
• ≥90: Normal
• 60-89: Mild decrease
• 30-59: Moderate decrease
• 15-29: Severe decrease
• <15: Kidney failure
Example: 65-year-old, creatinine 1.3, African American = GFR 62 mL/min/1.73m^2 (Stage 2 CKD - mild reduction)
📐 Formula
CKD-EPI Formula (most accurate):
GFR = 141 × min(Cr/κ, 1)^α × max(Cr/κ, 1)^-1.209 × 0.993^Age × K
Where:
• Cr = Serum creatinine (mg/dL)
• κ = 0.7 (female) or 0.9 (male)
• α = -0.329 (female) or -0.411 (male)
• K = 1.018 (female) or 1.0 (male)
GFR Stages:
• ≥90: Normal
• 60-89: Mild decrease
• 30-59: Moderate decrease
• 15-29: Severe decrease
• <15: Kidney failure
GFR = 141 × min(Cr/κ, 1)^α × max(Cr/κ, 1)^-1.209 × 0.993^Age × K
Where:
• Cr = Serum creatinine (mg/dL)
• κ = 0.7 (female) or 0.9 (male)
• α = -0.329 (female) or -0.411 (male)
• K = 1.018 (female) or 1.0 (male)
GFR Stages:
• ≥90: Normal
• 60-89: Mild decrease
• 30-59: Moderate decrease
• 15-29: Severe decrease
• <15: Kidney failure
📝 Example Calculation
Example: 65-year-old, creatinine 1.3, African American = GFR 62 mL/min/1.73m^2 (Stage 2 CKD - mild reduction)