GFR Calculator
Calculate your Glomerular Filtration Rate (GFR) to assess kidney function.
Result
Fill in the fields above, then press Calculate.
A GFR calculator estimates your Glomerular Filtration Rate from a blood creatinine test, providing a key indicator of kidney function and helping detect chronic kidney disease early.
Examples
45-year-old male, creatinine 1.0
eGFR = 142 x min(1.0/0.9, 1)^(-0.302) x max(1.0/0.9, 1)^(-1.200) x 0.9938^45 = approximately 92 mL/min/1.73m² (Stage G1, normal).
Frequently Asked Questions
What does GFR measure?
Glomerular Filtration Rate measures how well your kidneys filter waste from your blood, expressed in mL/min/1.73m². A GFR of 90+ is generally considered normal. Lower values indicate reduced kidney function.
When should I be concerned about my GFR?
A single low GFR reading does not necessarily mean kidney disease. GFR below 60 for 3 or more months is considered chronic kidney disease. Always discuss results with your doctor, who will consider the full clinical picture.
Result
Your result appears here and follows you as you scroll.
Related Calculators
Quick Tips
- •Always discuss your eGFR results with your doctor, who can interpret them alongside other lab values and your medical history.
- •Stay well-hydrated before your blood test, as dehydration can temporarily affect creatinine levels.
- •If your eGFR is below 60, ask about follow-up testing to determine whether the change is acute or chronic.