Use this free GFR calculator to estimate adult eGFR from age, sex used by the equation, and standardized serum creatinine in mg/dL with the 2021 CKD-EPI creatinine equation.
female, age 50, creatinine 0.9 mg/dL
This is an adult education estimate, not a diagnosis, medication dose, transplant, pregnancy, pediatric, or emergency-care decision.
Estimate adult eGFR from a creatinine lab value.
Use the 2021 CKD-EPI race-free equation.
See a broad eGFR interpretation range.
Prepare questions for a clinician about kidney labs.
About 77.88 mL/min/1.73 m2
About 76.85 mL/min/1.73 m2
About 48.7 mL/min/1.73 m2
About 63.17 mL/min/1.73 m2
Need a slower walkthrough, a related calculator, or the full library? These links keep you close to the task you started.
Plain-language answers about when to use the estimate, what the formula means, what it cannot decide for you, and how privacy works.
Use it for simple educational checks, trend tracking, or planning tasks like these: Estimate adult eGFR from a creatinine lab value. Use the 2021 CKD-EPI race-free equation. It can help you understand a number, but it cannot explain your whole health situation.
Enter age in years, sex used by the equation, and standardized serum creatinine in mg/dL from a lab result. Do not enter micromoles per liter, old lab values, cystatin C, urine albumin, or body weight in the creatinine box.
In plain language: eGFR = 142 x min(Scr/k, 1)^alpha x max(Scr/k, 1)^-1.200 x 0.9938^age x sex factor. Scr is standardized serum creatinine in mg/dL. For this calculator, k is 0.7 and alpha is -0.241 for the female equation, k is 0.9 and alpha is -0.302 for the male equation, and the female equation uses a 1.012 multiplier. No race coefficient is used. Read the result together with the notes on the page, because health and fitness numbers often need personal context.
Read eGFR as an adult kidney-filtration estimate in mL/min/1.73 m2. The range label is context only. Kidney disease, medication dosing, and next steps depend on repeat labs, urine albumin, symptoms, diagnosis, age, pregnancy status, body size, and clinician review.
It uses the 2021 CKD-EPI creatinine equation for adults. The inputs are age, sex used by the equation, and standardized serum creatinine in mg/dL. It does not use cystatin C, urine albumin, race, height, weight, or body surface area entered by the user.
No. This page uses the 2021 CKD-EPI creatinine equation without a race coefficient, matching the current race-free formula structure published for adult creatinine-based eGFR reporting.
The equation on this page expects standardized serum creatinine in mg/dL. Some lab reports use micromoles per liter. Do not type a value from a different unit system unless the lab report or a clinician gives the mg/dL value.
No. A single estimate is not a diagnosis. Kidney disease assessment can depend on repeat eGFR, urine albumin, blood pressure, diabetes, medications, imaging, symptoms, acute illness, and clinician judgment.
Not as a decision tool. Pediatric, pregnancy, transplant, acute kidney injury, dialysis, amputation, unusually high or low muscle mass, and severe illness situations can need different clinical interpretation or formulas.
Do not panic from one calculator result. Check that age, sex, creatinine unit, and lab value were entered correctly, then discuss the lab report with a clinician, especially if the result is new, repeated, or paired with symptoms or abnormal urine tests.
This educational eGFR estimate is not a kidney disease diagnosis, lab report, medication dosing instruction, transplant, pregnancy, pediatric, or emergency-care tool. Confirm kidney results with a clinician, especially if symptoms, abnormal urine tests, repeat low eGFR, diabetes, high blood pressure, medication changes, or acute illness are involved. Use the calculator as a learning tool, then ask a qualified professional about decisions that affect care, pregnancy, medication, nutrition, or safety.
Check the units, date, and personal details before reading the answer. For example, pounds and kilograms, inches and centimeters, or a wrong activity level can change the result quickly. If the number feels surprising, rerun it slowly and compare it with the examples.
No. The calculator runs in your browser tab. Recent answers stay only on the page while you use it, and they are not sent to a server.