eGFR (CKD-EPI 2021) & KDIGO Staging
Serum creatinine
Age (years)
Sex
Urine ACR (optional)
Adds the albuminuria (A) stage and the KDIGO risk category.
Enter creatinine, age, and sex to see the result.
KDIGO risk grid
| GFR stage | A1<3 mg/mmol | A23–30 mg/mmol | A3>30 mg/mmol |
|---|---|---|---|
| G1≥90 | Low | Moderately increased | High |
| G260–89 | Low | Moderately increased | High |
| G3a45–59 | Moderately increased | High | Very high |
| G3b30–44 | High | Very high | Very high |
| G415–29 | Very high | Very high | Very high |
| G5<15 | Very high | Very high | Very high |
LowModerately increasedHighVery high
Enter an ACR value above to mark the patient's cell on this grid.
When eGFR is not valid
- Acute kidney injury — creatinine is not in steady state.
- Extremes of muscle mass (amputation, muscle wasting, body builders) or very atypical diet.
- Pregnancy.
CKD is defined by abnormalities present for > 3 months; a single reading does not stage CKD on its own.
Show formula
Scr (mg/dL) = Scr (µmol/L) ÷ 88.4
eGFR = 142 × min(Scr/κ, 1)α × max(Scr/κ, 1)−1.200 × 0.9938age × 1.012 (if female)
Female: κ = 0.7, α = −0.241 · Male: κ = 0.9, α = −0.302
Source: Inker LA, Eneanya ND, Coresh J, et al. New Creatinine- and Cystatin C-Based Equations to Estimate GFR without Race. N Engl J Med. 2021;385(19):1737–1749.