Methodology

One method, one shared engine

The same formula is implemented once and reused by every page that depends on it. This reduces drift between similar calculators and makes regression testing practical.

• Inputs are validated before calculation.
• Units are normalized before formulas run.
• Outputs show the method and major assumptions.
• Policy and reference tables carry a source version and review date.

Estimates are labeled as estimates

Activity multipliers, body-composition equations, calorie targets, pregnancy dates and sleep-cycle planning all have uncertainty. Results are written to reflect that uncertainty instead of implying clinical precision.