Estimate glomerular filtration rate using the CKD-EPI 2021 equation.
No. Gfr Calculator is free, with no signup required, and nothing you enter leaves your browser.
Gfr Calculator is built on published formulas and reference ranges from established health sources. We revisit it periodically as guidance evolves; the "Last reviewed" date above shows when that last happened. If something looks wrong, tell us with the feedback button in the bottom-right corner.
No. Gfr Calculator gives you a general estimate based on the inputs you provide, not a diagnosis. Existing conditions, medications, and individual history all change what a number actually means for you. Treat this as a starting point for a conversation with a doctor or other qualified health professional, not a substitute for one.