eGFR Calculator (CKD-EPI 2021 Race-Free)

eGFR Calculator (CKD-EPI 2021 Race-Free) | Online Free Tool | Elysia Tools

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category: Health
Input types: number, select
Output type: json
Sample coverage: 4
API ready: Yes

Overview

The eGFR Calculator estimates glomerular filtration rate for stable adults using the CKD-EPI 2021 race-free creatinine equation. Enter age, sex, and serum creatinine in mg/dL to receive a BSA-indexed eGFR in mL/min/1.73 m² and an associated CKD stage. This tool is not medical advice.

When to use

Estimate kidney filtration for CKD staging in a stable adult.
Review how age, sex, and serum creatinine affect an eGFR result.
Apply the CKD-EPI 2021 race-free equation consistently in clinical or educational calculations.

How it works

1Enter an age from 18 to 120 years, select male or female, and provide a positive serum creatinine value in mg/dL.
2The calculator applies the CKD-EPI 2021 race-free creatinine equation, using sex-specific κ and α values.
3It returns eGFR in mL/min/1.73 m² and assigns a CKD stage from G1 to G5.
4Choose the number of decimal places for the displayed result; the default is 4.

Use cases

Estimate and document eGFR for chronic kidney disease staging.
Teach the effect of age, sex, and serum creatinine on the CKD-EPI 2021 calculation.
Standardize repeat eGFR calculations for stable adult patients during clinical review.

Examples

1. eGFR estimate for a 60-year-old man

Clinician or medical student

Background

A stable 60-year-old male patient has a serum creatinine of 1.4 mg/dL.

Problem

Estimate kidney filtration and identify the corresponding CKD stage.

How to use

Enter age 60, select Male, enter serum creatinine 1.4 mg/dL, and set decimal places to 4.

{"age":60,"sex":"male","serumCreatinine":1.4,"decimalPlaces":4}

Outcome

The calculator returns an eGFR of 57.5394 mL/min/1.73 m² and CKD stage G3a, described as mildly to moderately decreased.

2. eGFR estimate for a 40-year-old woman

Healthcare learner

Background

A stable 40-year-old female patient has a serum creatinine of 0.7 mg/dL.

Problem

Calculate eGFR at the female CKD-EPI equation's κ knot point.

How to use

Enter age 40, select Female, enter serum creatinine 0.7 mg/dL, and use 4 decimal places.

FAQ

What equation does this calculator use?

It uses the CKD-EPI 2021 race-free creatinine equation described by Inker and colleagues.

What units should I enter for serum creatinine?

Enter serum creatinine in mg/dL.

What does the eGFR result represent?

It is a body-surface-area-indexed estimate reported in mL/min/1.73 m² for CKD staging.

Can I use this result for drug dosing?

No. The result is BSA-indexed; drug dosing should use an appropriate un-indexed creatinine clearance method, such as Cockcroft-Gault.

When should this calculator not be relied on?

It is intended for stable adults and is not validated here for AKI, pregnancy, amputees, or body-size extremes.

{"age":40,"sex":"female","serumCreatinine":0.7,"decimalPlaces":4}

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Examples that match this tool

Continue with connected tools and hubs

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Overview

When to use

How it works

Use cases

Examples

1. eGFR estimate for a 60-year-old man

2. eGFR estimate for a 40-year-old woman

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