Tools

Calculators & self-assessments

Simple, transparent calculations — no account required, nothing stored.

BMI Calculator

Estimate body mass index from your height and weight.

Estimate a daily hydration target based on body weight and activity.

Find your training zones from age and resting heart rate.

Estimate daily protein needs based on body weight and training goal.

Estimate daily calorie needs based on body stats and activity level.

Work backward from a wake time to align with 90-minute sleep cycles.

Convert between pace, distance and finish time.

A simple self-report estimate based on established lifestyle risk factors.