GFR Calculator
Estimate glomerular filtration rate (eGFR) to assess kidney function.
GFR Calculator
Estimate glomerular filtration rate (eGFR) to assess kidney function.
Body Mass Index (BMI)
ℹ️ Underweight < 18.5 | Normal 18.5–24.9 | Overweight 25–29.9 | Obese ≥ 30
Disclaimer
Results provided by this calculator are for informational and educational purposes only. They are based on the values you enter and standard formulas, and should not be considered financial, medical, legal, or professional advice. Always consult a qualified professional before making important decisions based on these results. Roughtools makes no warranties regarding the accuracy or completeness of these calculations for your specific situation.
Frequently Asked Questions
Pro Tips
BMI does not distinguish between muscle and fat — athletes routinely register as "overweight." Use BMI alongside waist circumference and body fat percentage for a complete picture.
Waist-to-height ratio (waist ÷ height) below 0.5 is a strong predictor of metabolic health — often more useful than BMI for assessing cardiovascular risk.
Asian populations have higher metabolic risk at lower BMI values. Some clinicians use BMI ≥23 as overweight for Asian adults, not the WHO standard of 25.
Track your BMI trend over months, not as a single snapshot. A consistent downward trend matters far more than hitting a specific number on any given day.
When to Use This Calculator
Calculate your BMI as part of your annual health self-assessment alongside blood pressure and cholesterol.
Find the BMI-normal weight range for your height to set a realistic, medically-recognised target weight.
Check whether BMI is in the healthy range before conceiving — optimal range reduces pregnancy complications.
Monitor BMI monthly during a training program — though note athletes may show high BMI despite low body fat.
Calculate your BMI in advance so you can have an informed conversation about your weight with your healthcare provider.
About the GFR Calculator
The GFR Calculator estimates glomerular filtration rate (eGFR) using the 2021 CKD-EPI creatinine equation, which is the current standard recommended by the National Kidney Foundation. Enter your serum creatinine, age, and sex to get an eGFR value with CKD staging guidance. This is an educational estimation tool — diagnosis and treatment decisions require a physician.
How to Use the GFR Calculator
- 1
Enter your serum creatinine level (from a blood test) in mg/dL or μmol/L.
- 2
Enter your age in years.
- 3
Select your biological sex (affects the equation coefficient).
- 4
Click Calculate to see your estimated eGFR and CKD stage.
- 5
Read the stage description and consult your doctor for clinical interpretation.
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