GFR Calculator — Calculate Your Glomerular Filtration Rate
Determine your estimated Glomerular Filtration Rate (eGFR) instantly. Input your serum creatinine, age, and gender to clinically assess your kidney function.
Your Glomerular Filtration Rate (GFR) is widely considered by medical professionals to be the single most important and accurate overall indicator of your kidney function. Within your kidneys are millions of tiny filtering units called glomeruli, which act as microscopic sieves to remove toxins, excess fluids, and metabolic waste from your bloodstream. The GFR calculation determines exactly how many milliliters of blood these glomeruli can clean per minute (adjusted for standard body surface area). Because chronic kidney damage often occurs silently—without any noticeable physical pain or symptoms until the very late stages—routine screening with a GFR calculator is vital. Our tool utilizes the globally accepted CKD-EPI (2021) equation to help you identify early signs of Chronic Kidney Disease (CKD) so you can take preventative action.
Calculate Your GFR
The CKD-EPI equation is validated for adults aged 18 and older.
Obtained from your latest blood chemistry panel or kidney function test (KFT).
Awaiting Inputs
Please input your gender, age, and serum creatinine level on the left to calculate your Glomerular Filtration Rate (GFR).
How to Use This Calculator
To calculate your eGFR, you will need the results of a recent blood test (specifically your Serum Creatinine level). Follow these steps:
- Enter Your Serum Creatinine: Find the creatinine value on your blood test report. Select the correct unit (mg/dL is standard in India/US; µmol/L is standard in the UK/Australia) and enter the number.
- Enter Your Age: Kidney function naturally declines as you get older, so age is a critical variable in the CKD-EPI equation.
- Select Biological Sex: Men typically have higher muscle mass than women, which produces more baseline creatinine. Selecting gender adjusts the formula for these physiological differences.
- Calculate: The tool will output your eGFR in mL/min/1.73m² and indicate your current CKD stage.
What Your Result Means
Your calculated eGFR places your kidney function into one of five standard clinical stages. Lower GFR numbers represent higher degrees of kidney impairment and toxin buildup in the blood:
| CKD Stage | eGFR Range (mL/min) | Clinical Meaning | Action Plan / Follow Up |
|---|---|---|---|
| Stage 1 | ≥ 90 | Normal or high kidney function with minor kidney damage signs (if present) | Monitor periodically, manage glucose and blood pressure if diabetic/hypertensive |
| Stage 2 | 60 – 89 | Mildly decreased kidney function, often associated with healthy aging | Check creatinine once a year, control cardiovascular risk factors |
| Stage 3a | 45 – 59 | Mildly to moderately decreased kidney function | Consult a nephrologist, review medications, avoid NSAID pain relievers |
| Stage 3b | 30 – 44 | Moderately to severely decreased kidney function | Nephrology monitoring, review diet for sodium/potassium restrictions |
| Stage 4 | 15 – 29 | Severely decreased kidney function | Urgent nephrologist consultation, discuss prep for dialysis or transplant |
| Stage 5 | < 15 | Kidney failure (End-Stage Renal Disease) | Immediate clinical care, renal replacement therapy (Dialysis/Transplant) |
When to See a Doctor
If your calculation reveals a GFR of less than 60 for three consecutive months, you are clinically diagnosed with Chronic Kidney Disease (CKD) and must see a specialist immediately. Furthermore, if your low GFR is accompanied by physical symptoms such as severe swelling in the ankles (edema), chronic fatigue, metallic taste in the mouth, or foamy/bloody urine, do not wait—seek emergency medical evaluation.
At Prakash Hospital, our Nephrology Department offers comprehensive renal care, from early conservative management of Stage 3 CKD to advanced hemodialysis and kidney transplant support. Our multidisciplinary team will help you manage the root causes of kidney decline, such as hypertension and unmanaged diabetes.
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Consult Our Experts
Frequently Asked Questions
Find answers to common questions about your GFR calculation at Prakash Hospital Noida.
What is the difference between GFR and creatinine?
Why doesn't the calculator ask for race anymore?
Can a low GFR score return to normal?
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