Health Tools9 tools

Health calculators with the formulas shown

Health numbers deserve two things they rarely get online: the actual published formula, and privacy. Every calculator here names the equation it uses, and everything you enter about your body stays in your browser, because weight, measurements and due dates are nobody's marketing data.

The calorie calculator runs the Mifflin-St Jeor equation for BMR and TDEE, and the macro calculator splits the result into protein, carbs and fat for your goal. The body fat calculator uses the US Navy tape method, the ideal weight calculator shows four published formulas side by side instead of pretending one is truth, and the BMI calculator does the classic screen with its limits stated. The water intake calculator and pregnancy due date calculator round out the set.

Two more are about the body in motion and at rest. The running pace calculator solves for pace, time or distance from the other two and prints the split table you can actually run against, and the sleep calculator works backwards in 90-minute cycles to bedtimes that avoid waking mid-cycle, with cycles described as the averages they are rather than a rule.

None of this is medical advice, and every page says so where it matters. These are the standard screening formulas clinicians and coaches start from, computed exactly, with their assumptions in the open.