eGFR Calculator

About the eGFR Calculator

Estimated GFR (eGFR) is the main number used to assess how well your kidneys are filtering, and it underpins the staging of chronic kidney disease. Understanding it can help you make sense of a blood test result.

This eGFR Calculator estimates kidney function using the CKD-EPI equation, the current standard, from your serum creatinine, age and sex. It is an educational estimate, not a diagnosis.

How to use the eGFR Calculator

1. Enter your serum creatinine result.
2. Add your age and sex.
3. The tool applies the CKD-EPI equation.
4. See your estimated GFR.

Key features of the eGFR Calculator

• Uses the current CKD-EPI equation
• Estimates kidney filtration (eGFR)
• Helps you understand a blood test
• Standard clinical methodology
• Private — calculated in your browser

How the eGFR Calculator works

This calculator applies standard, peer-reviewed formulas used by health professionals and public-health bodies worldwide. Depending on the metric, that includes the World Health Organization (WHO) classification, NHS and CDC guidance, the Mifflin-St Jeor equation for metabolic rate, and the U.S. Navy method for body composition. Inputs are converted between metric and imperial units using exact factors so results are consistent whichever system you use.

All calculations are performed in your browser, so the health information you enter is never sent anywhere.

Tips & best practices

• eGFR is an estimate from a single blood marker — trends across several tests matter more than one value.
• Many factors can affect creatinine and eGFR, so interpretation belongs with your healthcare team.
• This tool is for understanding results, not for diagnosing or managing kidney disease.

Standards & accuracy

Uses internationally recognised clinical formulas — WHO, NHS, CDC, the U.S. Navy method and Mifflin-St Jeor — for screening-grade estimates.

Important: these tools provide screening-grade estimates for general information and education only. They are not a medical diagnosis and do not replace professional advice. Always consult a qualified healthcare provider before making health decisions.

Who uses the eGFR Calculator?

• Making sense of an eGFR blood result
• Understanding kidney-function staging
• Medical and nursing study
• Health education

Privacy & security

The eGFR Calculator runs entirely inside your web browser. Your data — whether that is a file, figures or text — is processed on your own device and is never uploaded to a server, stored or shared. There is no signup and no account, so you can use it as often as you like while keeping full control of your information. This makes it a safe choice even for confidential and sensitive work.

Why choose Toolinza?

• 100% free — no hidden charges, watermarks or usage caps.
• Private & secure — your data stays on your device.
• Standards-compliant — accurate results suitable for the UK, USA, Canada, Australia, EU, India, Pakistan, the Middle East and worldwide.
• Works everywhere — desktop, tablet and mobile.

Frequently asked questions