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ShapeUpAmerica.com is for informational purposes only. The calculators and tools provided are not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions regarding a medical condition.

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CategoriesBody Composition

Body Composition

Standard metrics for physical dimensions, weight, and clinical classification.

Understanding your body composition is often more useful than tracking weight alone. This category focuses on the relationship between your dimensions and tissue types. Beyond basic BMI, we offer tools like the US Navy Body Fat Calculator and Lean Body Mass estimators to help you see the difference between muscle gain and fat loss. We evaluate body fat percentage, muscle mass, and regional fat distribution using clinical ratios.
15 Tools Available

BMI Calculator

Standard body mass index calculation with clinical classification.

Body Composition
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BMI Prime

A ratio of actual BMI to upper limit BMI.

Body Composition
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Body Fat Calculator

Estimate body fat percentage via US Navy method.

Body Composition
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Body Surface Area

Calculate total skin surface area.

Body Composition
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Child BMI (%)

BMI percentile for children and teens (2-19).

Body Composition
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FFMI Calculator

Fat-Free Mass Index for muscularity analysis.

Body Composition
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Height Percentile Tool

Compare height with the general population.

Body Composition
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Ideal Body Fat Range

Healthy body fat targets by age and gender.

Body Composition
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Ideal Weight Calculator

Calculate recommended healthy weight.

Body Composition
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Updated

Lean Body Mass (LBM)

Calculate the mass of your body excluding fat.

Body Composition
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Pregnancy Weight Guide

Recommended weight gain based on pre-pregnancy BMI.

Body Composition
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Relative Fat Mass (RFM)

A simpler, clinical alternative to BMI.

Body Composition
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Waist Reduction Estimator

Predict waist changes based on fat loss.

Body Composition
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Updated

Waist-to-Height Ratio

A simple indicator of abdominal obesity.

Body Composition
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Updated

Waist-to-Hip Ratio

Evaluate body fat distribution.

Body Composition
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