GFR Calculator

Estimate your Glomerular Filtration Rate (eGFR) — the best overall measure of kidney function — using the CKD-EPI 2021, MDRD, and Cockcroft-Gault equations.

Your Information

Sex

Age (years)

Weight Units

Weight (kg)

Creatinine Units

Serum Creatinine (mg/dL)

Normal creatinine: 0.7–1.2 mg/dL. Values from a standard blood test (CMP or BMP).

Equation	Best Used For
CKD-EPI 2021	Current standard; race-free; most accurate for adults
MDRD	Historical standard; less accurate at higher GFR
Cockcroft-Gault	Drug dosing; estimates creatinine clearance (CrCl)

Results

CKD Stage (CKD-EPI 2021)

Stage G1 — Normal or High

Normal kidney function. Monitor if underlying kidney disease present.

CKD-EPI 2021 eGFR

94.6

mL/min/1.73 m²

MDRD eGFR

80.8

mL/min/1.73 m²

Cockcroft-Gault CrCl

92.4

mL/min (used for drug dosing)

CKD Staging Reference

Stage	eGFR	Description
G1	≥ 90	Normal or High
G2	60–89	Mildly Decreased
G3a	45–59	Mildly to Moderately Decreased
G3b	30–44	Moderately to Severely Decreased
G4	15–29	Severely Decreased
G5	0–14	Kidney Failure

Important: This calculator is for informational purposes only. eGFR should be interpreted by a healthcare professional alongside other clinical information. A single eGFR value does not diagnose CKD — diagnosis requires persistently low eGFR for ≥ 3 months.