Health

Calculate your Body Mass Index (BMI) to assess if you're at a healthy weight.

Calculate raw ABSI from height, weight, and waist circumference using the 2012 Krakauer equation. See units, measurement method, and study limits.

Calculate an adjusted weight from your entered actual weight, reference weight, and factor; see the formula and limits.

Calculate raw BAI from hip circumference and height, with population-based body-fat estimation limits and no individual health grade.

Estimate body fat using the US Navy circumference equations, with source population and measurement limits.

Calculate the raw height-to-wrist ratio using measurements in the same unit. Learn how this differs from a sourced body-frame chart.

Explore body proportions and an approximate, unvalidated styling label from your measurements.

Estimate total body surface area in square meters from height and weight using Du Bois, Mosteller, Haycock, and Fujimoto formulas, with sources and limitations.

How to measure knee height, ulna length, and demispan when a bedridden adult cannot stand, with source-specific limits on height estimation.

Explore facial proportions and an approximate, unvalidated styling label for hairstyle and accessory ideas.

Calculate estimated fat-free mass and raw FFMI, with optional Kouri height normalization and the original male-athlete study context.

Compare five height/sex reference-equation variants, their descriptive mean and an adult BMI screening weight band; these are not personal weight targets.

Calculate educational heart-rate-reserve scenarios using 220 minus age, resting heart rate and explicit percentage bands. Read the method, rounding and limitations.

Compare Boer, James and Hume lean-mass estimates or subtract an entered body-fat fraction from total mass, with population and physical-output limits.

Calculate raw Ponderal Index as weight in kg divided by height in metres cubed (kg/m³), without adult clinical grades or body-type labels.

Estimate adult whole-body fat percentage from height, waist circumference, and the sex coefficient in the 2018 RFM equation, with units and study limits explained.

Estimate body fat with Jackson–Pollock 3/7-site or Durnin–Womersley 4-site equations, using required sites and derivation-age limits.

Calculate waist circumference divided by hip circumference, using the WHO measurement protocol and explaining the limits of the raw ratio.

Calculate waist circumference divided by height in the same unit. Read sourced measurement instructions and clinical eligibility limits.

Calculate raw BMI for a child from height and weight. Learn why pediatric weight status requires age- and sex-specific growth charts.

Calculate adult BMI for ages 20 and older, with the same screening thresholds for women and men, a separate body-fat prediction, and a BMI reference weight band.

Calculate raw BMI for a teen from height and weight. Learn why BMI alone cannot provide a percentile, weight category, or target weight.

Calculate adult BMI for ages 20 and older, with the same screening thresholds for women and men, a separate body-fat prediction, and a BMI reference weight band.

Compare a BMI reference mass with current mass and an entered constant rate using explicit 7700 kcal/kg or 3500 kcal/lb arithmetic and its limits.

Calculate BMI for adults aged 60 and older using CDC adult screening categories, with interpretation cautions from age 65.

Convert entered energy into free-sugar equivalents at 10% and 5%, and calculate the energy share of entered grams. Educational WHO 2015 context.

Compare named resting-energy equations and explore a selected numeric multiplier scenario.

Calculate the named revised Harris–Benedict resting-energy equation with documented coefficients and units.

Illustrate the published 370 + 21.6 × lean mass formula using entered weight and body fat or direct lean mass.

Estimate resting energy with the 1990 Mifflin–St Jeor equation for ages 19–78. See the formula, a worked example, and why REE differs from measured BMR.

See a Mifflin–St Jeor resting-energy estimate and an optional activity-factor scenario. Includes a worked example and limits; no automatic diet targets.

Compare a daily energy expenditure figure with daily energy intake using simple subtraction. Learn what the difference can and cannot show.

Convert a daily calorie target and carbohydrate, protein and fat percentages you enter into grams.

Review your own answers about food choices, eating patterns, drinks, and dietary restrictions.

Explore Dietary Reference Intakes for macronutrients, vitamins, minerals, and total water by age, sex, and pregnancy or breastfeeding status.

Calculate your Estimated Energy Requirement (EER) to determine daily calorie needs for maintaining energy balance.

Convert a daily calorie target and total-fat percentage you enter into grams of fat.

Look up Health Canada total-fiber AI values by age, sex and life stage.

Convert a daily calorie target and carbohydrate, protein and fat percentages you enter into grams.

Convert a daily calorie target and carbohydrate, protein and fat percentages you enter into grams.

Explore Mifflin–St Jeor resting-energy estimates and numeric factors, without personal maintenance or diet prescriptions.

Calculate the total calories in your meals by adding up individual food items and ingredients.

Look up age, sex, pregnancy, or lactation reference intakes for vitamins and minerals, with each value labeled AI or RDA.

Compare carbohydrate label arithmetic using an explicit fiber-inclusive or fiber-excluded basis, without automatic sugar-alcohol deductions.

Multiply your entered weight by a g/kg coefficient you choose to explore protein-gram arithmetic.

Calculate gross reference kcal from weight and minutes for named 2024 Adult Compendium activities, with adult 19–59 scope and limits.

Calculate Mifflin–St Jeor REE for ages 19–78 and compare the existing revised Harris–Benedict prediction.

Calculate Mifflin–St Jeor resting-energy arithmetic for ages 19–78 and selected multiplier scenarios.

Multiply estimated resting energy by a selected activity factor to explore a hypothetical scenario. Learn why the result is not measured TDEE or an intake target.

Look up Health Canada vitamin RDA/AI values by age, sex and life stage.

Look up vitamin A RDA/AI values and the preformed-vitamin-A upper level from Health Canada.

Look up age-based vitamin D AI or RDA and upper intake level. Includes food examples from NIH ODS.

Explore entered weight-gain scenarios with a Mifflin resting-energy reference, selected local factors and fixed 7700 kcal/kg arithmetic.