Adult eGFR equations do not work well in children because muscle mass changes with growth. The updated bedside Schwartz equation (2009) was developed with modern creatinine assays and is recommended for children aged 1–18.
How to use the Pediatric eGFR Calculator
- Height
- Serum creatinine
Results update as you type, and every field accepts the units shown in its menu.
How it works
Enter the child’s height and serum creatinine.
Tips
- Use your child’s current weight – doses and fluids depend on it.
- Ask your paediatrician or pharmacist before giving any medicine.
- Keep a feeding and nappy log for the first weeks.
- Call your doctor urgently if a baby under 3 months has a fever.
Common mistakes to avoid
- Using adult formulas for children.
- Measuring liquid medicines with a kitchen spoon.
- Comparing premature babies by birth age instead of corrected age.
Inputs explained
| Field | What to enter |
|---|---|
| Height | Units: cm, in, m, ft, mm |
| Serum creatinine | Units: mg/dL, µmol/L |
Example values
How the main result changes when Height changes and everything else stays at the example values above:
| Height (cm) | eGFR (bedside Schwartz) (mL/min/1.73 m²) |
|---|---|
| 65 | 54 |
| 97.5 | 81 |
| 130 | 107 |
| 162.5 | 134 |
| 195 | 161 |
Health note: this calculator is for education and screening only and is not a diagnosis or treatment advice. Discuss your results with a qualified clinician.
Formula
eGFR (mL/min/1.73 m²) = 0.413 × height (cm) ÷ serum creatinine (mg/dL)Worked example
Inputs — Height: 130 cm; Serum creatinine: 0.5 mg/dL.
Results — eGFR (bedside Schwartz) = 107 mL/min/1.73 m²; CKD stage = G1 – normal.
Key terms
- Bedside Schwartz
- eGFR = 0.413 × height ÷ creatinine.
Frequently asked questions
What is a normal eGFR in children?
Above 90 after about age 2; it is lower in infants as the kidneys mature.
Can the Schwartz formula be used in babies?
It is less accurate under 1 year.
Is there a better equation?
The CKiD U25 equations including cystatin C are more precise.
What formula does the Pediatric eGFR Calculator use?
eGFR (mL/min/1.73 m²) = 0.413 × height (cm) ÷ serum creatinine (mg/dL).