eGFR Calculator
Estimate your kidney function from a creatinine result and see your CKD stage in seconds.
You’ll learn: your eGFR number and what stage (G1-G5) it falls in.
~1 minOpen tool
Free Kidney Health Tools
Understand your kidney numbers in under a minute.
Calculators, symptom checkers and lab-result explainers that turn a blood or urine test into a plain-language answer – reviewed by nephrologists, free to use, and private.
- Nephrologist-reviewed
- No sign-up
- Results stay in your browser
Reviewed by consultant nephrologists Private – nothing stored without consent CKD-EPI 2021 · KDIGO staging Non-profit · always free
Choose your tool
Every kidney tool, in one place
Twelve free tools across three jobs: crunch a number, make sense of a symptom, or read your lab report. Start with the one that matches what you have in front of you.
Calculators
Enter a lab value and get a clear result with your CKD stage or a kidney-safe range.
5 tools
GFR Calculator
See your glomerular filtration rate and where it sits on the kidney-function scale.
You’ll learn: your GFR and whether it is in a healthy range.
~1 minOpen tool
Creatinine Clearance
Estimate clearance using the Cockcroft-Gault method – useful for medication dosing.
You’ll learn: your creatinine clearance in mL/min.
~2 minOpen tool
Kidney-Safe Protein
Find a daily protein range that supports your kidneys at your stage of CKD.
You’ll learn: a protein target range to discuss with a dietitian.
~2 minOpen tool
Fluid Intake
Plan your daily fluids if you are on dialysis or have been given a fluid limit.
You’ll learn: a daily fluid allowance to plan around.
~2 minOpen tool
Symptom checkers
Answer a few questions to understand what your symptoms might mean and how urgently to act.
3 tools
Kidney Disease Symptoms
Tired, swollen, or off? Check whether your symptoms could point to kidney disease.
You’ll learn: which symptoms are worth raising with a doctor.
~3 minOpen tool
Kidney Stone Symptoms
Sharp, wave-like back or side pain? See whether it fits the picture of a kidney stone.
You’ll learn: how urgently you may need care.
~2 minOpen tool
Kidney Pain Assessment
Work out whether your pain is likely from your kidneys – and what to do next.
You’ll learn: likely causes and warning signs to watch for.
~2 minOpen tool
Lab-result explainers
Got a blood test back? Paste your number and read what it means in plain English.
4 tools
eGFR Blood Test Results
Understand what your eGFR result means for your kidney health – without the jargon.
You’ll learn: whether your eGFR is normal, watch, or a concern.
~1 minOpen tool
Creatinine Levels
See the normal creatinine range and what a high or low result may be telling you.
You’ll learn: where your creatinine sits versus the normal range.
~1 minOpen tool
Kidney Function Tests
A plain-language guide to every number on a kidney panel and why it matters.
You’ll learn: what eGFR, creatinine, urea and ACR each mean.
~4 minOpen tool
BUN:Creatinine Ratio
Calculate your BUN-to-creatinine ratio and what it hints about hydration and kidneys.
You’ll learn: your ratio and whether it is in the usual range.
~2 minOpen tool
Simple by design
How the tools work
No accounts, no jargon, no pressure. Three steps from a number on a page to a next step you can act on.
Enter what you have
Type in a lab value or answer a few short questions. If you are not sure where to find a number, each tool shows you where it lives on a test report.
Get a plain-language result
See your number, your range, and what it means in everyday words – with a calm explanation, never a scary label.
Take the right next step
Save your result to share with your own doctor, or connect with a verified nephrologist through KidneyGlobal.
Why you can trust these tools
Built on the same standards your specialist uses
- The right equations. Our eGFR tools use the CKD-EPI 2021 creatinine equation and map results to KDIGO GFR categories.
- Reviewed by nephrologists. Every tool and its explanations are checked by a practising kidney specialist.
- Sourced, not invented. Reference ranges and guidance draw on KDIGO, the National Kidney Foundation and NICE.
- Honest about limits. These tools estimate and educate. They do not replace a diagnosis.
Sources: KDIGO 2024 Clinical Practice Guideline for CKD · National Kidney Foundation · NICE.
Your numbers, explained by a real nephrologist
A calculator gives you a number. A specialist tells you what it means for you — your history, your medications, your next step. Book a private video consultation with a verified kidney specialist, often within days.
Verified specialists · secure video · you choose who you see. Consultation fees are set by each specialist.
Good questions
Kidney tools – your questions, answered
Are these kidney tools free?
Yes – every calculator, symptom checker and lab explainer is free and needs no sign-up. Your inputs are used only to show your result and are not saved unless you choose to. KidneyGlobal is a non-profit initiative.
Can these tools diagnose kidney disease?
No. They help you understand a result or symptom and decide what to discuss with a clinician. They do not diagnose conditions or replace professional medical advice.
What counts as a normal eGFR?
For many adults, an eGFR of 90 or above is in the usual range, but the full picture includes urine findings, age, health history and whether a result stays low over time.
Which equation does the eGFR calculator use?
The eGFR tools use the CKD-EPI 2021 creatinine equation and map results to KDIGO GFR categories.
My result looks abnormal – what should I do?
Do not panic or change treatment on your own. Save the result, check the explanation, and speak with your clinician about what it means in your context.
Is my health data private?
The tools are designed to show results in your browser. Nothing is stored without your consent. Avoid entering information that could identify you.
Medical disclaimer. KidneyGlobal’s tools are for education and general information. They don’t diagnose conditions, replace professional medical advice, or set personal treatment targets. Always talk to your clinician about your results and before making any change to your care.
Medically reviewed by Dr. Amara Okafor, MD, PhD (Nephrology) · last updated May 2025
Start where you are
One number is all it takes to begin.
Pick a tool, get a plain-language answer, and know your next step — for free.