Estimate adult kidney filtration using race-free 2021 CKD-EPI equations, with documented lab units and non-diagnostic GFR categories.
01 / INPUTS & ASSUMPTIONS
Adult informational eGFR estimate only—not a diagnosis, medication dose or treatment recommendation. Do not use this calculator for pediatric patients or to determine care. Discuss lab results and clinical context with a healthcare professional.
02 / RESULT & EXPLANATION
Medical information only—not a diagnosis, medication-dosing calculation or treatment recommendation. Adults 18+ only; no pediatric equation is implemented. CKD assessment needs clinical evidence, kidney-damage markers and persistence for at least 3 months. Estimates may be unreliable with acute kidney injury, unstable creatinine, unusual muscle mass, pregnancy or other clinical contexts. Discuss results with a healthcare professional.
| Category | eGFR (mL/min/1.73 m²) |
|---|---|
| G1 | ≥90 |
| G2 | 60–<90 |
| G3a | 45–<60 |
| G3b | 30–<45 |
| G4 | 15–<30 |
| G5 | <15 |
Enter your values locally; no inputs are uploaded.
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Review the explanation, copy supported outputs or reset the workspace.
Enter the values and units for gfr calculator, review the stated scope, then choose Calculate. Use the worked explanation and bounded tables to check the result; copy or reset locally.
Use NKF-verified race-free adult equation coefficients with explicit standardized lab units, physiological equation parameters and non-diagnostic filtration categories.
GFR Calculator inputs and calculations remain in browser memory. No external processing service receives entered values. Existing website infrastructure may log ordinary page requests; copying occurs only when selected.
The default is the adult race-free 2021 CKD-EPI creatinine equation. The optional combined method uses the 2021 creatinine–cystatin C equation. Formula coefficients were checked against the National Kidney Foundation sources on October 26, 2026.
The documented convention is 88.4 µmol/L per 1 mg/dL. Creatinine entered in µmol/L is divided by 88.4 before the equation. Cystatin C is entered in mg/L.
It selects the physiological coefficient used in the published equation, not a gender-identity assessment. The calculator does not infer this input. Discuss which equation inputs are appropriate with a qualified clinician.
No. G1 through G5 are filtration categories, not standalone diagnoses. CKD assessment requires clinical evidence, kidney-damage markers where applicable and persistence for at least three months. Display rounding near a boundary does not establish disease.
Acute kidney injury, unstable creatinine, unusual muscle mass, pregnancy and other clinical contexts can make estimates unreliable. Standardized lab assays are required: IDMS-traceable creatinine and standardized cystatin C for the combined method.
No. This implementation is adult informational scope only, ages 18–120, and does not implement a pediatric equation, absolute-GFR conversion, drug dosing or treatment recommendations. Confirm interpretation with a healthcare professional.