Tools
Interactive calculators and utilities available on this site.
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BMI Calculator: Understand Your Body Mass Index Number and Its Limits
Use this BMI calculator to see your number and learn what the WHO categories from 1995 actually mean for one person—and what they cannot tell you about your body.
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TDEE Calculator: Estimate Your Total Daily Energy Expenditure as a Range
Estimate your total daily energy expenditure and understand why the Mifflin-St Jeor equation produces a range, not a single accurate number for any individual.
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Body Fat Calculator: US Navy Method Estimate and Its Error Against DXA
Calculate your body fat percentage using the US Navy circumference method and learn how the estimate compares to DXA, including who it reads worst for.
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Ideal Weight Calculator: See the WHO Healthy BMI Range for Your Height
See the WHO healthy BMI weight range for your height and learn where the Devine, Robinson, Miller, and Hamwi formulas came from and why they disagree.
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Waist to Height Ratio Calculator: Measure Central Adiposity Risk at Home
Calculate your waist-to-height ratio and learn why NICE CG189 uses the 0.5 boundary, how to measure consistently, and how the WHO and NIH landmarks differ.
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Child BMI Calculator: Plot Your Child's Percentile on CDC Growth Charts
Calculate your child's BMI percentile using CDC 2000 growth charts and understand what a centile actually means—and why it is not a body fat measurement.