Health & fitness

Body weight & composition

Compare height-based reference weight formulas, estimate body-fat percentage, and turn a weight goal into a practical time and energy scenario.

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Calculator set

Body weight & composition calculators

Open a calculator for an immediate estimate, then use its method notes, examples, limits, and sources to understand the result.

Ideal weight calculator for menCompare four common height-based ideal-weight estimates for men and see their average.Calculate Ideal weight calculator for womenCompare four common height-based ideal-weight estimates for women and see their average.Calculate Body fat percentage calculatorEstimate body-fat percentage, fat mass, and lean mass from height and circumference measurements.Calculate Weight loss goal calculatorEstimate a weight-loss timeline and implied daily energy gap from your current and target weights.Calculate

Understand, then calculate

Make sense of the key numbers in Body weight & composition

Body-weight formulas describe broad reference points. They do not measure health, muscle mass, bone structure, fat distribution, or an individual’s medical needs by themselves.

Use consistent measurements to watch trends, and treat any target as a range. Sustainable changes matter more than matching a single formula result.

Result checklist

What you can work out here

Identify the decision first, then open the calculator that answers it.

Reference weight range: Compare several height-based formulas instead of one absolute target.
Estimated body-fat percentage: Use circumference measurements for a repeatable estimate.
Goal difference: Measure the distance between current and target weight.
Planning timeline: Relate a selected weekly pace to an estimated duration.

Essential concepts

Core terms in plain language

Understand the recurring inputs and results instead of reading only the final number.

Reference weight: A formula-based comparison point, not a prescribed ideal.
Body-fat percentage: The estimated share of total body weight made up of fat mass.
Circumference method: An indirect estimate based on measured body dimensions.
Energy deficit: Energy intake below estimated expenditure over a period.

Choose with context

Which calculator should you use?

Use these distinctions to move through the Body weight & composition tools without comparing unrelated results.

01
Reference-weight formulas are broad comparisons, not personal diagnoses.
02
Use the same measurement method when tracking body-fat trends.
03
Choose a realistic pace before estimating a weight-loss timeline.

Common questions

What else to know about Body weight & composition

These answers explain how to use the estimates and where their limits begin.

Why do ideal-weight formulas disagree?

They were developed from different assumptions and populations. Use the spread as context, not as a prescription.

How often should I compare body-fat estimates?

Use the same method and similar conditions; longer-term trends are more meaningful than small day-to-day changes.