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Free fitness tool

Body Fat Estimate Calculator

Create a rough body-fat category estimate from simple measurements, then use ZenFit AI to choose a realistic goal direction.

Use this in my plan Use the free estimate first

Estimate your targets

Enter the basics that shape this estimate, then use the interactive calculator after the app loads to adjust the numbers.

Input

sex

Input

height

Input

weight

Input

waist measurement

Input

goal

1

rough category

This output is useful for planning, not for diagnosis or guaranteed results.

2

waist-to-height ratio

This output is useful for planning, not for diagnosis or guaranteed results.

3

planning direction

This output is useful for planning, not for diagnosis or guaranteed results.

Methodology

Uses a rough waist-to-height and sex-based category model. It is not a diagnostic body-composition scan and should not be treated as exact.

The estimate should be compared with real-world outcomes over time. Body weight trends, training performance, hunger, schedule, sleep, injury status, and consistency can all change what works in practice.

Important safety note

This tool is for general fitness education and planning context. It is not medical advice. If you are pregnant, managing a medical condition, recovering from an injury, changing medication, or unsure whether a calorie or training change is appropriate, speak with a qualified clinician.

Next step

Build the plan behind this result

Use the quiz to connect this tool's estimate to workouts, meals, progress tracking, and AI coach context around your real week.

Use this in my plan

Frequently asked questions

Is this body fat estimate exact?

No. It is a rough planning aid. Body-fat scales, tape estimates, photos, and scans all have error ranges.

Should body fat percentage decide my whole plan?

No. Training history, goal, performance, adherence, health context, and progress trends also matter.

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