justyourcalculatorGFR Calculator
Estimated glomerular filtration rate from a creatinine blood test.
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GFR Calculator
eGFR with the CKD-EPI 2021 equation
eGFR
104 mL/min/1.73 m²
Stage G1: normal or high
- Stage
- G1 (Normal or high)
- Creatinine used
- 0.9 mg/dL · 80 µmol/L
Not medical advice. eGFR is an estimate; kidney disease is diagnosed by a doctor from repeated tests (including urine albumin) over at least 3 months. It's less reliable with very high or low muscle mass, in pregnancy, or with acute illness. Uses the 2021 CKD-EPI creatinine equation, which has no race term.
How it was calculated
- eGFR = 142 × min(Scr/κ, 1)^α × max(Scr/κ, 1)^-1.200 × 0.9938^age
- κ = 0.9, α = -0.302; Scr/κ = 1
- = 104 mL/min/1.73 m²
| Stage | eGFR (mL/min/1.73 m²) | Kidney function |
|---|---|---|
| G1 | 90 or more | Normal or high |
| G2 | 60 - 89 | Mildly decreased |
| G3a | 45 - 59 | Mildly to moderately decreased |
| G3b | 30 - 44 | Moderately to severely decreased |
| G4 | 15 - 29 | Severely decreased |
| G5 | under 15 | Kidney failure |
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How the gfr calculator works
GFR (glomerular filtration rate) measures how much blood your kidneys filter each minute. It's estimated from a creatinine blood test. For adults this calculator uses the CKD-EPI 2021 equation, recommended by the National Kidney Foundation and the American Society of Nephrology, which dropped the old race coefficient.
eGFR = 142 × min(Scr/κ, 1)^α × max(Scr/κ, 1)^-1.200 × 0.9938^age × 1.012 (if female), where κ is 0.7 for women and 0.9 for men and α is -0.241 for women and -0.302 for men. For children, the Bedside Schwartz formula uses height and creatinine.
Kidney disease stages G1 to G5 follow KDIGO. A single low value isn't a diagnosis; it has to persist for 3 months or come with other signs of kidney damage.
Using and checking your result
Published by JustYourCalculator. Check the units and assumptions above, and compare a known example before relying on the output. Calculations use browser arithmetic and may round displayed values.
This tool provides an estimate, not a diagnosis, treatment plan or individualized medical advice. Population formulas may not fit children, pregnancy, athletes or people with health conditions. Discuss health decisions with a qualified clinician.
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