Skip to content
OverCalculator
Theme

Health tool map

Body measures

Body size, composition, energy needs, and personal measurements.

Choose the tool whose inputs and output match your task. Check each calculator’s assumptions and limitations before using its result.

Latest update:

Body-measure tools turn height, weight, age, and a few circumferences into screening and planning numbers: BMI categories, waist-to-height ratio, body-fat and lean-mass estimates, and daily energy needs. Start with the BMI calculator for a quick height-weight screen, or the waist-to-height ratio calculator when you want a waist-based comparison against the common 0.5 threshold. For energy planning, the BMR calculator estimates resting needs and can be extended to maintenance calories with an activity factor. Use the body fat calculator for circumference-based composition estimates. These are population-range estimates, not measurements or diagnoses: muscle mass, body composition, and clinical context can change interpretation. Explore more body and wellness tools in the Health collection.

15 of 15 calculators

Body measures15 calculators

ABSI (A Body Shape Index) Calculator

Calculate raw ABSI (A Body Shape Index) from waist circumference, height, and weight, with measurement and interpretation limits.

Updated

Verified

Army Body Fat Calculator

Estimate the army body fat percentage with the AR 600-9 circumference method from height, neck, waist, and (for women) hip measurements, with the age-band screening-table maxima shown for reference only.

Updated

Verified

BMI Calculator (Adult Body Mass Index)

Popular

Calculate adult BMI from metric or imperial height and weight — body mass index formula, CDC categories, healthy weight range, and interpretation limits.

Updated

Verified

BMR Calculator

Estimate BMR with Mifflin-St Jeor and Harris-Benedict equations, then compare activity-adjusted daily energy estimates.

Updated

Verified

Body Fat Calculator (Circumference Method)

Estimate body fat percentage from neck, waist, and hip circumference measurements, with derived fat mass and lean mass using the legacy coefficient equations.

Updated

Verified

BSA Calculator (Body Surface Area, Mosteller)

Estimate body surface area (BSA) with the Mosteller formula from height and weight — metric or imperial, with the exact equation and clinical limits explained.

Updated

Verified

Calorie Deficit Weight-Loss Timeline Calculator

Estimate daily calorie target from Mifflin-St Jeor TDEE and a weekly loss goal, then see how many weeks it takes to reach a target weight.

Updated

Verified

Daily Water Intake Calculator

Estimate a daily water target from the NASEM adequate intake for total water scaled to your weight, plus an exercise add-on, with liters, milliliters, and cups.

Updated

Verified

Historical Hamwi Weight Formula Calculator

Reproduce the historical Hamwi weight formula and frame-size multipliers as transparent arithmetic, not a health target.

Updated

Verified

Ideal Body Weight Calculator (Devine)

Calculate ideal body weight with the Devine formula for men and women in metric or imperial units, plus the healthy weight band for your height.

Updated

Verified

Lean Body Mass Calculator (Boer)

Estimate lean body mass with the Boer 1984 formula from height and weight, plus derived fat mass and body fat percentage.

Updated

Verified

Macronutrient Calculator

Estimate daily protein, carbohydrate, and fat grams from Mifflin-St Jeor BMR, activity level, goal multiplier, and selected macro split.

Updated

Verified

TDEE Calculator

Estimate TDEE (total daily energy expenditure) and maintenance calories from Mifflin-St Jeor BMR and activity level, plus mild 10% deficit and surplus targets.

Updated

Verified

Waist-to-Height Ratio Calculator

Calculate waist-to-height ratio (WHtR) in centimeters and classify it against the 0.5 screening threshold, with measurement guidance and interpretation limits.

Updated

Verified

Waist-to-Height Ratio Calculator (WHtR)

Calculate your waist-to-height ratio (WHtR) from matching units, with the formula, worked examples, and the raw ratio without diagnostic categories.

Updated

Verified

Frequently asked questions

Is this Army body fat calculator official?
No. It is an educational estimate that mirrors the formula and age bands coded in this page, but official Army determinations depend on current policy, trained personnel, required rounding, forms, and any updates to the Army Body Composition Program. Use it for practice and documentation review, not for personnel decisions.
What measurements does the calculator use?
The calculator uses sex, age, height in inches, neck in inches, and waist in inches, plus hip in inches for the female equation. For males the waist is the abdomen, measured at navel level; for females it is the natural waist at its smallest point. The waist, neck, hip, and height measurements follow AR 600-9's half-inch rounding conventions, and the resulting body fat estimate is rounded to the nearest whole percent.
Why does age matter if there is no pass or fail result?
Age selects the reference age band only. The calculator shows the AR 600-9 Table B-2 screening-table maximum for the under-21, 21–27, 28–39, and 40-and-over bands (male limits of 20, 22, 24, and 26 percent; female limits of 30, 32, 34, and 36 percent) as reference information, but it does not compare your result against them and emits no pass or fail verdict.

More in Health

NutritionExercise & fitnessPregnancyHealth screeningMore health tools

Related topics

The same topic in other collections.

Strength & training

Related comparisons

All Health comparisons →
ABSI (A Body Shape Index) vs BMI CalculatorCompare the ABSI (A Body Shape Index) calculator with the adult BMI calculator: BMI weighs weight against height for a screening category, ABSI adds waist circumference to capture body shape.Army Body Fat vs ABSI (A Body Shape Index)Compare two body-composition estimates: the Army circumference-method body fat percentage with age-band screening maxima shown as reference versus the raw ABSI research shape index.Army Body Fat vs Body Fat CalculatorCompare the Army circumference method and the legacy Hodgdon circumference body-fat estimate: different measurements, different equations, and different outputs for the same person.BMI vs BMR CalculatorCompare BMI and BMR: body mass index classifies height and weight into adult screening categories, while basal metabolic rate estimates resting calorie needs from the same measurements.BMI vs Body Fat CalculatorCompare the BMI weight-for-height screening with the body-fat circumference estimate: what each measures, what each cannot show, and which one fits your question.BMI vs BSA CalculatorCompare BMI and BSA: body mass index divides weight by height squared for adult screening categories, while the Mosteller body surface area formula estimates the body's external surface in square meters.BMI vs Ideal Body Weight CalculatorCompare the BMI and ideal body weight calculators: body mass index category and healthy weight range versus the Devine formula's single weight-for-height point alongside the same BMI band.BMR vs Calorie Intake CalculatorCompare the BMR calculator with the resting energy expenditure calculator: the same Mifflin equation family, but one adds activity factors and TDEE while the other stops at the resting estimate.BMR vs TDEE CalculatorCompare the BMR and TDEE calculators: a resting-energy estimate with an equation comparison versus a maintenance-calorie estimate with mild deficit and surplus targets.Body Fat vs Lean Body Mass CalculatorCompare the two body-composition estimators: circumference-method body fat percentage from neck, waist, and hip measurements versus the Boer 1984 lean body mass formula from height and weight, with derived fat mass and body fat percentage.BSA vs Hamwi Ideal WeightCompare two body-size numbers from height and weight: the Mosteller body surface area estimate in square meters versus the historical Hamwi weight range.Calorie Deficit vs Weight Loss TimelineCompare calorie deficit and weight-loss timeline calculators: one models subtracting a fixed daily amount from a Mifflin-St Jeor energy estimate, the other derives a daily calorie target and weeks-to-goal from a chosen weekly loss rate.Daily Water Intake vs MacronutrientsCompare two daily intake planning tools: the NASEM-based daily water target with an exercise add-on versus the Mifflin-St Jeor macronutrient gram targets.Ideal Body Weight vs Healthy WeightCompare the Devine ideal body weight formula with its BMI healthy-weight band against the historical Hamwi formula and its frame-size multipliers.Ideal Body Weight vs Lean Body Mass CalculatorCompare ideal body weight and lean body mass: a weight-for-height heuristic versus an estimate of fat-free tissue from height and weight.Macro Calculator vs Weight-Loss TimelineCompare two calorie-target tools built on Mifflin-St Jeor: a full macro split from a lose/maintain/gain goal versus a weekly-rate deficit and weeks-to-goal timeline.Macronutrient Calculator vs Macro CalculatorCompare two macro calculators built on Mifflin-St Jeor: percentage-based protein, carb, and fat splits with a goal multiplier versus a fixed 25% fat split and an adjustable g/kg protein target.Protein Calculator vs Lean Body MassCompare the protein reference calculator's per-kilogram daily protein coefficients with the lean body mass calculator's Boer 1984 estimate of non-fat mass, fat mass, and body fat percentage.TDEE vs Calorie Deficit CalculatorCompare TDEE and calorie deficit: one reports maintenance calories with mild 10% targets, the other models a selected daily subtraction from the same energy estimate.TDEE vs Macro CalculatorCompare TDEE and macro calculators: one estimates maintenance calories from Mifflin-St Jeor with mild 10% targets, the other applies a goal adjustment and splits calories into protein, fat, and carbs.Waist-to-Height Ratio vs BMI CalculatorCompare two body-size screening measures: weight-for-height BMI categories versus waist-to-height ratio and the 0.5 threshold.Waist-to-Height Ratio vs Hamwi Ideal WeightCompare two ways to assess weight health: the raw waist-to-height ratio from your own measurements versus the historical Hamwi formula's height-based weight range.Waist-to-Height vs Waist-to-Height RatioCompare the two waist-to-height calculators: the raw unitless ratio with no categories versus the same division classified against the widely cited 0.5 screening threshold.Water Intake vs Daily Water Intake CalculatorCompare the two daily hydration calculators: a weight-and-lifestyle estimate built on 35 ml per kilogram with climate and caffeine adjustments, versus a NASEM adequate-intake target scaled to your weight with an exercise add-on.

← Back to Health