Health Calculation Engine
Shared formulas for BMI, BMR, TDEE, body fat, heart rate, pregnancy dates, pace, calorie burn, and wellness estimators.
Phase 8.0 — Health Platform Foundation
This page documents the reusable system that will power Body Measurements, Nutrition, Fitness, Pregnancy & Family, and Medical Wellness calculators.
Foundation modules
Metric / Imperial Unit Layer
Reusable conversion utilities so every health calculator can support kg/lb, cm/ft-in, ml/oz, and activity-based formulas.
Health Safety & Disclaimer System
Every health result receives educational framing, non-diagnostic language, and clear escalation guidance for medical concerns.
Health Insight Engine
Result interpretation, range labels, confidence messaging, recommended next step, and related calculator suggestions.
Health Accessibility Layer
Keyboard-friendly inputs, readable result cards, ARIA labels, focus states, mobile-first spacing, and high-contrast warnings.
Health QA Framework
Formula verification, input validation, edge-case testing, unit conversion testing, and medical disclaimer checks.
Reusable health input catalog
| Input | Label | Type | Default | Unit |
|---|---|---|---|---|
| age | Age | number | 30 | years |
| sex | Sex used by formula | select | female | |
| heightCm | Height | number | 170 | cm |
| heightFt | Height feet | number | 5 | ft |
| heightIn | Height inches | number | 7 | in |
| weightKg | Weight | number | 70 | kg |
| weightLb | Weight | number | 154 | lb |
| waistCm | Waist | number | 82 | cm |
| hipCm | Hip | number | 98 | cm |
| neckCm | Neck | number | 38 | cm |
| activityLevel | Activity level | select | moderate | |
| goal | Goal | select | maintain | |
| pregnancyStartDate | Last menstrual period or start date | date | ||
| cycleLength | Cycle length | number | 28 | days |
| restingHeartRate | Resting heart rate | number | 70 | bpm |
| systolic | Systolic pressure | number | 120 | mmHg |
| diastolic | Diastolic pressure | number | 80 | mmHg |
Health formula registry prepared
- BMI and healthy weight formulas
- BMR and TDEE formulas
- Macro and protein target formulas
- Water intake estimates
- Heart rate zone calculations
- Pregnancy due date and ovulation windows
- Blood pressure and cholesterol ratio labeling
- Unit conversion helpers for kg/lb, cm/in, ml/oz, and pace/time
Mandatory disclaimer
Health calculators on ToolsBing are for general education and planning only. They are not medical advice, diagnosis, treatment, or a substitute for a qualified clinician. Seek urgent care for severe symptoms, pregnancy concerns, chest pain, breathing difficulty, fainting, or any emergency.