CKD eGFR Calculator

Q: What does eGFR measure?

eGFR estimates how well the kidneys filter waste from the blood. It is expressed as mL/min/1.73m² and is interpreted together with clinical findings and urine albumin results.

Q: Can one low eGFR result diagnose chronic kidney disease?

No. Chronic kidney disease generally requires abnormalities of kidney structure or function that persist for at least three months. A single result should be interpreted in clinical context and repeated when appropriate.

Q: Why is albuminuria included in the calculator?

Albuminuria provides additional prognostic information. Combining the GFR category with the albuminuria category produces the CGA classification and helps estimate CKD progression and cardiovascular risk.

Q: Which creatinine unit should be entered?

The default is µmol/L, which is commonly used in Malaysia. The unit switch can be used for mg/dL, and the calculator converts the value before applying the equation.

Q: Is this calculator a substitute for clinical assessment?

No. It is an educational and clinical support tool. Results should be interpreted by a qualified healthcare professional together with symptoms, trends, medications, hydration status, muscle mass, and other investigations.

Clinical Calculator

Estimate glomerular filtration rate, identify the CKD G stage, and assess KDIGO prognosis when albuminuria data is available.

This calculator uses the 2009 CKD-EPI creatinine equation to estimate renal function and automatically assigns the CKD G stage. It also allows optional albuminuria input for CGA classification and KDIGO prognosis.

How to use the calculator

Enter serum creatinine, age, sex, and race in the eGFR section.
The default creatinine unit is µmol/L. Use the unit switch if your result is in mg/dL.
Click Calculate eGFR to get the estimated GFR and CKD G stage.
If albuminuria data is available, enter ACR or AER in the optional section.
Click Calculate Albuminuria + KDIGO to get the A category, CGA stage, and KDIGO 2012 prognosis.

Input

Patient Information

Serum Creatinine (µmol/L)

µmol/L mg/dL

Default unit in Malaysia is µmol/L. Switch unit only if your creatinine result is reported in mg/dL.

Age (years)

Sex

Race

For use in Malaysia, the usual default is Non-Black. The Black coefficient is intended for African / African-American populations in the original equation.

Equation used:
eGFR = 141 × min(Scr/κ, 1)^α × max(Scr/κ, 1)^-1.209 × 0.993^Age × 1.018 (if female) × 1.159 (if black)

View variable details

Where Scr is serum creatinine in mg/dL, κ is 0.7 for females and 0.9 for males, α is -0.329 for females and -0.411 for males, min indicates the minimum of Scr/κ or 1, and max indicates the maximum of Scr/κ or 1.

Estimated Glomerular Filtration Rate

—

mL/min/1.73m²

Stage not calculated yet

CKD Grade

—

Clinical Description

Please enter the required values

Status

Waiting for calculation

CKD Stage Overview

Normal or high kidney function

≥ 90

Mildly decreased kidney function

60–89

G3a

Mild to moderately decreased

45–59

G3b

Moderately to severely decreased

30–44

Severely decreased kidney function

15–29

Kidney failure

< 15

Step 2

Albuminuria Category and KDIGO 2012 Prognosis

This section is optional. Calculate eGFR first, then continue here if albuminuria data is available.

Albuminuria Category Input

Choose one measurement type from the CKD guideline: ACR (Albumin-to-Creatinine Ratio) in mg/g, ACR in mg/mmol, or AER (Albumin Excretion Rate) in mg/24h.

Measurement Type

Value

Albuminuria grading used: A1 normal to mildly increased, A2 moderately increased, A3 severely increased.

Albuminuria Grade

—

CGA Stage

—

KDIGO 2012 Prognosis

Waiting for albuminuria input

Prognosis of CKD by GFR and Albuminuria Category (KDIGO 2012)

GFR \ Albuminuria	A1	A2	A3
G1	Low	Moderate	High
G2	Low	Moderate	High
G3a	Moderate	High	Very high
G3b	High	Very high	Very high
G4	Very high	Very high	Highest
G5	Highest	Highest	Highest

Low Moderately increased High Very high Highest

Frequently Asked Questions

What does eGFR measure?

eGFR estimates how well the kidneys filter waste from the blood. It is expressed as mL/min/1.73m² and is interpreted together with clinical findings and urine albumin results.

Can one low eGFR result diagnose chronic kidney disease?

No. Chronic kidney disease generally requires abnormalities of kidney structure or function that persist for at least three months. A single result should be interpreted in clinical context and repeated when appropriate.

Why is albuminuria included in the calculator?

Albuminuria provides additional prognostic information. Combining the GFR category with the albuminuria category produces the CGA classification and helps estimate CKD progression and cardiovascular risk.

Which creatinine unit should be entered?

The default is µmol/L, which is commonly used in Malaysia. The unit switch can be used for mg/dL, and the calculator converts the value before applying the equation.

Is this calculator a substitute for clinical assessment?

No. It is an educational and clinical support tool. Results should be interpreted by a qualified healthcare professional together with symptoms, trends, medications, hydration status, muscle mass, and other investigations.

References

Levey AS, Stevens LA, Schmid CH, et al. A New Equation to Estimate Glomerular Filtration Rate. Annals of Internal Medicine. 2009;150(9):604–612.
Kidney Disease: Improving Global Outcomes (KDIGO) CKD Work Group. KDIGO 2012 Clinical Practice Guideline for the Evaluation and Management of Chronic Kidney Disease. Kidney International Supplements. 2013;3(1):1–150.