eGFR Calculator (CKD-EPI 2021)
Turn your creatinine result into your kidney filtration number, in plain words.
Common questions
What does eGFR mean?
eGFR stands for estimated glomerular filtration rate. It is an estimate of how much blood your kidneys filter each minute, calculated from your creatinine level, age, and sex. Think of it as a percentage of full kidney function: an eGFR of 60 means your kidneys are working at roughly 60 percent of normal.
What is a normal eGFR for my age?
Young healthy adults usually have an eGFR above 90, and kidney function naturally drops by about one point per year after age 40. So an eGFR in the 60s or 70s can be common in people over 70 without meaning disease. Anything below 60, at any age, deserves a conversation with your own doctor.
Does one low eGFR result mean I have kidney disease?
No. Kidney disease is only diagnosed when eGFR stays below 60 on tests at least 90 days apart, or when there are other signs of damage such as protein in the urine. A single low result can come from dehydration, a recent big meal, or lab variation. Ask your doctor to repeat the test and to check a urine albumin test before drawing any conclusions.
What can make my creatinine result misleading?
Creatinine comes from muscle, so very muscular people can look worse than they are and frail people with little muscle can look better than they are. A large meat meal before the blood draw, and supplements such as creatine, can also raise creatinine without any change in your kidneys. If your result seems off, review your situation with your own doctor.