1. Scientific Calculation Framework & Methodology
At HealthGrowth.in, we believe algorithmic wellness tools must be built upon rigorous clinical science, verified mathematical models, and absolute transparency. This Calculator Policy defines the strict criteria under which all 234+ calculation tools are researched, engineered, and maintained.
2. Formula Sourcing & Clinical Attribution
Every calculator on HealthGrowth.in is calibrated strictly against recognized clinical standards and peer-reviewed literature:
- Body Composition & Metabolism: Mifflin-St Jeor (1990), Revised Harris-Benedict (1984), Katch-McArdle equations, and WHO BMI classification matrices.
- Renal & Nephrology: CKD-EPI 2021 race-neutral eGFR formula, Cockcroft-Gault Creatinine Clearance, MDRD equations, and KDIGO staging guidelines.
- Cardiovascular & Hemodynamics: Mean Arterial Pressure (MAP), Pulse Pressure, Framingham Risk Score, ASCVD Pooled Cohort Equations (ACC/AHA), and CHA2DS2-VASc scoring.
- Pediatrics & Growth: World Health Organization (WHO) Child Growth Standards (0–5 years) and CDC Growth Charts (2–20 years).
- Obstetrics & Pregnancy: Naegele's Rule, Parikh's Formula, gestational age ultrasound regression models, and ACOG weight gain guidelines.
- Clinical Emergency Scores: Wells Criteria for DVT/PE, Glasgow Coma Scale (GCS), NIH Stroke Scale (NIHSS), CURB-65, HEART score, and SOFA/qSOFA sepsis models.
3. Unit System Precision & Standardized Conversions
To avoid rounding errors and unit mismatch discrepancies, our computation engine implements fixed conversion constants based on the International System of Units (SI):
- Mass: 1 pound (lb) = 0.45359237 kilograms (kg) exactly.
- Length: 1 inch (in) = 2.54 centimeters (cm) exactly.
- Blood Glucose: 1 mmol/L = 18.0182 mg/dL.
- Serum Creatinine: 1 mg/dL = 88.4 μmol/L.
- Cholesterol: 1 mmol/L = 38.67 mg/dL.
4. Continuous Peer-Review & Error Resolution SLA
Medical consensus evolves. HealthGrowth.in maintains a scheduled bi-monthly audit of algorithmic parameters against newly released consensus statements from major clinical organizations (e.g. ADA, AHA, KDIGO, WHO, ACOG).
5. Zero-Data-Retention & Computational Transparency
All calculations are performed client-side. We publish the full mathematical equations in the accompanying guide on every calculator page so users and clinicians can independently inspect and verify step-by-step arithmetic.