How We Test Our Calculators

This page describes the practical QA methodology used to keep FastBMI calculators accurate and consistent.

1. Formula validation

Each calculator is mapped to published equations. We verify implementation against known references before release and after major updates.

2. Deterministic test cases

We run fixed inputs where expected output is pre-calculated. Examples:

Calculator	Input snapshot	Expected outcome pattern
BMI	70 kg, 1.75 m	BMI 22.9 (normal category)
Calorie/TDEE	Mifflin-St Jeor baseline profile	BMR + activity multiplier consistency
Ideal Weight	Fixed height profile	Stable output across Devine/Robinson/Miller/Hamwi

3. UX sanity checks

Input validation for impossible or empty values.
Error states that guide correction instead of silent failure.
Mobile rendering checks for key screens.

4. Change control

When formulas, thresholds, or interpretation text changes, we update related pages (calculator, FAQs, and relevant blog posts) and refresh sitemap dates.

5. Reporting a suspected issue

If you believe a result is wrong, send the exact input set and screenshot to corrections@fastbmi.com.

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