GFR Calculator
Estimate glomerular filtration rate (eGFR) using the MDRD formula to assess kidney function.
This calculator uses the MDRD (Modification of Diet in Renal Disease) formula to estimate GFR. It is intended as a screening tool only. A healthcare professional should interpret eGFR results in the context of the full clinical picture.
What is GFR Calculator?
The GFR Calculator estimates glomerular filtration rate using the MDRD (Modification of Diet in Renal Disease) formula, a standard tool for assessing kidney function.
eGFR measures how well the kidneys filter waste from the blood and is expressed in mL/min/1.73m², enabling clinicians to classify chronic kidney disease (CKD) stages.
How does the GFR Calculator work?
Serum creatinine (Scr) is the primary input — it is a waste product of muscle metabolism that rises when kidney function declines.
The result is classified into CKD stages: Stage 1 (Normal, eGFR >= 90) through Stage 5 (Kidney Failure, eGFR < 15).
How to use the GFR Calculator?
- Enter the serum creatinine level in mg/dL from a recent blood test.
- Adjust the age slider to match the patient's age (18–100 years).
- Select the appropriate gender, as the formula applies a correction factor for females.
- Review the estimated eGFR and corresponding CKD stage on the right panel.
Example
Try the calculator with your own numbers
- Enter your values in the input fields above.
- Adjust the values to match your situation.
- The result updates instantly as you change the inputs.
Benefits of using the GFR Calculator
- Provides a quick eGFR estimate using the widely accepted MDRD equation.
- Automatically classifies the result into a CKD stage for easier interpretation.
- Requires only basic blood test data — no specialized equipment or imaging.
Who should use the GFR Calculator?
- Individuals planning loans, investments, or retirement savings.
- Salaried employees estimating taxes, EMIs, and take-home pay.
- Small business owners tracking costs, margins, and cash flow.
- Students learning personal finance and investment concepts.
Tips for getting the most out of the GFR Calculator
- Use realistic return rates — past performance does not guarantee future returns.
- Re-run the calculation whenever your income, expenses, or goals change.
- Compare a few scenarios (conservative, moderate, aggressive) before making a decision.
Frequently Asked Questions
Is this a substitute for a clinical diagnosis?
No. This calculator is a screening tool only. A healthcare professional should interpret eGFR results alongside other clinical findings.
Why does gender affect the result?
Males typically have higher muscle mass, which produces more creatinine. The female correction factor (0.742) adjusts for this physiological difference.
What CKD stage requires medical attention?
Stages 3–5 (eGFR below 60) generally warrant further investigation and management by a nephrologist or primary care physician.
Planning your finances is easier when you can see the numbers clearly. Use this calculator regularly to stay on top of your goals and make informed decisions.
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