Renal & electrolytes
eGFR calculator
Kidney function from a single creatinine — with the CKD stage, the reference, and South African units first.
How to read the result
Estimated GFR (mL/min/1.73 m²) falls into these published bands.
A 64-year-old woman with a serum creatinine of 124 µmol/L (1.4 mg/dL).
eGFR 42 mL/min/1.73 m² — CKD stage G3b
Moderately to severely decreased kidney function: renally cleared drug doses need review, and the stage anchors monitoring frequency and referral thresholds.
Who this is for
For clinicians checking chronic kidney function, staging CKD, or screening before nephrotoxic drugs and contrast. Takes creatinine in µmol/L as SA laboratories report it (mg/dL one tap away), and applies the race-free CKD-EPI 2021 equation now recommended by KDIGO.
How it works
What it calculates
Estimated glomerular filtration rate from serum creatinine, age, and sex using the CKD-EPI 2021 equation — the race-free revision now recommended by KDIGO — with the corresponding CKD stage (G1–G5).
When to use it
Assessing chronic kidney function, staging CKD, and screening before nephrotoxic drugs or contrast. It assumes a steady-state creatinine: it is not valid in acute kidney injury, pregnancy, or extremes of muscle mass.
eGFR or creatinine clearance?
eGFR is normalised to 1.73 m² and best for staging; many drug dosing references were validated against Cockcroft-Gault creatinine clearance — use the CrCl tool for those decisions.
Built on published evidence
- CKD-EPI 2021 race-free creatinine equation (Inker et al., NEJM). Adults only
Codification last reviewed 2026-08-28, and checked against published reference values in automated tests on every release — see the full evidence ledger.
Questions clinicians ask
Which equation does this calculator use?
The CKD-EPI 2021 creatinine equation — the race-free revision (Inker et al., NEJM 2021) now recommended by KDIGO. Older CKD-EPI 2009 and MDRD estimates can differ slightly, which is expected.
Can I enter creatinine in µmol/L?
Yes — µmol/L is the default, matching South African laboratory reports, with mg/dL one tap away. The conversion (1 mg/dL = 88.4 µmol/L) is handled exactly.
When should I use creatinine clearance instead of eGFR?
eGFR is normalised to 1.73 m² and best for staging chronic disease. Many drug-dosing references were validated against Cockcroft-Gault creatinine clearance — use the CrCl tool for those decisions. Neither is valid in acute kidney injury, where creatinine is not at steady state.
Does it work offline and is patient data stored?
It works fully offline once loaded, and no patient data is stored or transmitted — values stay in your browser tab only.
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