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Rough kidney filter number from blood creatinine. Uses CKD-EPI 2021 formula. Answer in mL/min/1.73 m² (standard way labs show it).
Fill the form and press Calculate eGFR. A small form with OTP opens first; after you send it, your number shows here. Same formula as CKD-EPI creatinine 2021 (no race factor) — National Kidney Foundation.
Estimated GFR (indexed)
— mL/min/1.73 m²
—
Full staging also uses urine albumin and time. This table is only GFR number for quick look.
| Category | eGFR range | Plain-language note |
|---|---|---|
| G1 | ≥ 90 | Normal or high number — CKD only if other kidney damage signs. |
| G2 | 60–89 | Slightly low — same rule as G1; need damage signs for CKD. |
| G3a | 45–59 | Lower — doctor follow-up. |
| G3b | 30–44 | More low — doctor follow-up. |
| G4 | 15–29 | Very low — kidney specialist often needed. |
| G5 | < 15 | Kidney failure range — dialysis / transplant talk with doctor. |
From KDIGO CKD guide — your hospital may use small changes; kidney doctor’s word is final.
Most lab panels have creatinine. eGFR helps doctor see kidney side of the report when needed.
Many drugs need lower dose if kidney is weak. Doctor uses eGFR plus other checks.
One number means less than same test method over months — up or down trend matters.
Formula fits creatinine from IDMS-standard machines. Your LIS and normal range should match that.