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Calculators
- CrCl Calculator (Cockcroft-Gault)
Standard adult creatinine clearance with actual, ideal and adjusted body weight side by side.
- CKD-EPI eGFR & CrCl Conversion Calculator
CKD-EPI 2021 creatinine, cystatin C and combined equations, plus Schwartz for children and a CrCl comparison.
- CrCl for Obese, Elderly, Amputee & Pediatric Patients
Weight-basis selection, Salazar-Corcoran, amputation correction, paediatric equations and mL/hour output.
- Ideal Body Weight Calculator for CrCl (Devine)
Devine ideal body weight, Bauer adjusted body weight and BMI, with the conventional basis for Cockcroft-Gault marked.
- 24-Hour Urine Creatinine Clearance Calculator
Measured clearance from a timed collection, with a collection-adequacy check and BSA normalisation.
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Equations used, sources cited, and who reviewed them.
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Ali Raza — who builds and maintains this site.
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Articles
- The Cockcroft-Gault Equation Explained
Where the equation came from, what each term is doing, why the 0.85 female factor exists, and the assumptions that decide whether the number you get is usable.
- CrCl vs eGFR: What's the Difference?
Is eGFR the same as creatinine clearance? No — different units, different purposes, and a conversion routinely done wrong. The difference, explained.
- How to Adjust CrCl for Obese Patients
Ideal body weight, adjusted body weight, Salazar-Corcoran — which to use, when, and how much difference the choice actually makes to a dose.
- Creatinine Clearance in Elderly Patients
Why a normal serum creatinine in an 84-year-old can hide severely reduced clearance, and whether rounding low creatinine values up to 1.0 is defensible.
- 24-Hour Urine Creatinine Clearance Test
How the test works, how to check whether the collection was actually complete, and why an incomplete collection is worse than no test at all.
- Renal Drug Dosing and Why CrCl Matters
How renal impairment changes drug handling, why dose reduction and interval extension are different tools, and where the common thresholds come from.
- CrCl in Amputees, Children & Race
Three populations where the standard approach is wrong: correcting weight after amputation, why Cockcroft-Gault must not be used in children, and why race went.
- Understanding Serum Creatinine
Where creatinine comes from, why the reference range misleads, and the drugs, diets and assay quirks that move the number without touching the kidneys.
- 10 Creatinine Clearance Mistakes
The errors that produce a confident wrong number — wrong weight basis, wrong units, wrong steady state, wrong measure entirely — and how to catch each one.
- Dosing When the Label Says CrCl, Not eGFR
Drug labels specify creatinine clearance; laboratories report eGFR. Which to dose against, when the gap changes the dose, and how to decide.