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Plan
Summary
Health calculators
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Guided experience
Start your weight-change plan →
One page. Your stats, target weight, and target date go in the control panel; calorie deficit, macro split, walking plan, and a live timeline chart come out on the right.
Calculators
BMI calculator
Body Mass Index from height and weight
TDEE calculator
Maintenance calories and weight-change targets
BMR calculator
Basal metabolic rate (Mifflin-St Jeor)
Macro calculator
Protein, carbs, and fat from TDEE and goal
Body fat % estimator
U.S. Navy circumference method
Waist-to-height ratio
Cardiometabolic risk signal — endorsed by NICE
Ideal body weight
Devine, Robinson, Miller, and Hamwi reference formulas
Reference articles
How to measure your waist correctly
Tape placement, conventions, and common mistakes
BMI for Asian adults
Why standard cut-offs under-flag risk
BMI for athletes
Why muscle breaks the formula
BMI for older adults (65+)
Why the rules change after 65