buncha/health & fitness/egfr

Creatinine Clearance + eGFR

Sex assigned at birth

Age (years)

Weight (kg)

Required for Cockcroft-Gault only

Serum creatinine

Creatinine units

Results

CKD-EPI 2021 · primary

64mL/min/1.73m²

G2 — mildly decreased

Race-free, current standard

MDRD

57mL/min/1.73m²

G3a — mild-moderate

Older eGFR formula

Cockcroft-Gault

66mL/min

Drug dosing — not BSA-normalised

Which formula matters when. CKD-EPI 2021 is what most labs report and what nephrology guidelines use for staging CKD. Cockcroft-Gault is still specified by many drug-dosing protocols (especially DOACs, vancomycin, and chemotherapy) by tradition — and because it gives an absolute clearance rather than a body-size-normalised one, which matters for renally-dosed drugs in obese or very thin patients. MDRD is the older eGFR formula and is being phased out in favor of CKD-EPI. When in doubt for drug dosing, use Cockcroft-Gault.

About the 2021 race-free update. Earlier CKD-EPI and MDRD formulas included a coefficient that adjusted upward for Black race. After years of clinical and equity advocacy, the National Kidney Foundation and ASN recommended removing the race coefficient in 2021. The 2021 CKD-EPI formula used here is the race-free version.

Read the guide

eGFR vs Cockcroft-Gault — Which to Use for Drug Dosing

Pairs well with

Kids Medication Dosage

Acetaminophen, Ibuprofen, Benadryl, Zyrtec, and Cl…

About Creatinine Clearance + eGFR

CKD-EPI 2021 (race-free), MDRD, and Cockcroft-Gault in one tool. With CKD stage classification and "which to use when" guidance.

Like every tool on Buncha, this one runs entirely in your browser. There's no upload, no log, no record of what you've pasted or generated. Close the tab and the data is gone.

↳ Have feedback or found a bug? hello@buncha.tools