Every named clinical equation behind the MedCalcTools calculators, in one dated, sourced table you can cite or download.
MedCalcTools runs eight clinical reference calculators, and each one is built on a single named, published equation rather than an in-house guess: the Quetelet index for BMI (1832), the ADAG study equation for A1C to eAG (Nathan et al., 2008), the Cockcroft-Gault equation for creatinine clearance (1976), the 2021 CKD-EPI equation for eGFR, the Payne formula for albumin-corrected calcium (1973), the Mosteller formula for body surface area (1987), the Friedewald equation for LDL cholesterol (1972), and the Katz (1973) and Hillier (1999) factors for glucose-corrected sodium. The table below lists the author, year, and journal for each, with a downloadable CSV.
01 - Summary table| Calculator | Formula name | Author(s) | Year | Journal / source |
|---|---|---|---|---|
| BMI Calculator | Quetelet Index (Body Mass Index) | Adolphe Quetelet; adult categories per CDC | 1832 / current | CDC |
| A1C to eAG Calculator | ADAG study linear equation | Nathan DM, et al. (ADAG Study Group) | 2008 | Diabetes Care |
| Creatinine Clearance Calculator | Cockcroft-Gault equation | Cockcroft DW, Gault MH | 1976 | Nephron |
| GFR Calculator | 2021 CKD-EPI creatinine equation | Inker LA, Eneanya ND, Coresh J, et al. | 2021 | New England Journal of Medicine |
| Corrected Calcium Calculator | Payne albumin correction | Payne RB, Little AJ, Williams RB, Milner JR | 1973 | British Medical Journal |
| Body Surface Area Calculator | Mosteller formula | Mosteller RD | 1987 | New England Journal of Medicine |
| LDL Cholesterol Calculator | Friedewald equation | Friedewald WT, Levy RI, Fredrickson DS | 1972 | Clinical Chemistry |
| Sodium Correction Calculator | Katz formula / Hillier correction factor | Katz MA; Hillier TA, Abbott RD, Barrett EJ | 1973 / 1999 | NEJM / American Journal of Medicine |
Download the full table as CSV (includes the exact formula as implemented on each calculator page).
02 - MethodologyEach row names the original paper or standards body that published the equation, not a secondary summary. We read the primary source (or, where the original journal article is paywalled, a citation-matched excerpt such as the PubMed abstract) before listing it here. The formula column mirrors the exact equation coded into that calculator's page, so you can check the math against the source yourself. No figure on this page is estimated, extrapolated, or generated; every cell is either a formula constant already published in the cited paper or the paper's own citation metadata (author, year, journal).
This table is reviewed whenever a cited society revises a formula, such as the National Kidney Foundation's 2021 move to the race-free CKD-EPI equation. The date above reflects the last full review. If a professional body revises one of these equations, we will update the row, the CSV, and this date together.
This page is a citation index, not medical guidance. It documents which published equation each calculator uses and where that equation came from. It does not tell you which formula applies to your situation, does not recommend a dose, and is not a substitute for a licensed clinician who knows your history.