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Ideal Weight & Body Fat Calculator

How much "ideal weight" makes sense for you — and how much of it is fat? Compare several formulas side by side and estimate your body fat with the US Navy method.

100% freeNo data storedMultiple methods

One number tells you little

"Ideal weight" is individual and not a medical requirement. Muscle mass, build, age and health matter more than a single figure. All results here are rough estimates and do not replace medical or nutritional advice.

Body data

cm
kg
yr

Circumference measurements (for body fat)

cm
cm
Recommended healthy-weight range

56.7–76.3 kg

BMI 18.5–24.9 — the best-supported reference

Your current weight

75.0 kg

to the range

Within the healthy-weight range

Ideal weight by method

BMI range

WHO healthy weight (recommended)

56.7–76.3 kg

Devine

from medicine/pharmacology

70.5 kg

Broca

rough rule of thumb, outdated

67.5 kg

Weight by method compared

Body fat percentage

US Navy method

16.9 %

from waist, neck & height

Deurenberg (cross-check)

20.1 %

estimate from BMI & age

Category

Fitness

Fat mass

12.7 kg

Lean mass

62.3 kg

EssentialAthletesFitnessAverageElevated

BMI

Current BMI

24.5

Target BMI range

18,5–24,9

Important notes

  • The Broca formula is a rule of thumb over 150 years old. It ignores build and muscle share and gives unrealistic values for very tall or short people — it is listed here for comparison only.
  • The US Navy formula estimates body fat from circumference measurements. It is practical but less accurate than a caliper reading, DEXA or hydrostatic weighing. Measure loosely, without pulling the tape tight.
  • A single figure is no substitute for a health assessment. Athletes with a lot of muscle often sit above the BMI range without being "overweight".
  • This calculation is non-binding and does not replace medical or nutritional advice. If you are worried about weight, eating behaviour or health, talk to a doctor.

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Guide: Ideal Weight & Body Fat

Formulas, measurement methods and what the scale really tells you

Calculating Ideal Weight: Which Formula Is Actually Right?Featured

Calculating Ideal Weight: Which Formula Is Actually Right?

Broca, Devine, BMI range or body fat percentage — which method gives the most meaningful "ideal weight"? The complete overview with strengths, weaknesses and a clear recommendation.

2026-07-0311 min read
Broca, Devine and BMI: The Ideal-Weight Formulas Compared

Broca, Devine and BMI: The Ideal-Weight Formulas Compared

Three classic formulas, three different results. We show how Broca, Devine and the BMI healthy-weight range calculate, where they come from and when each method makes sense.

2026-07-038 min read
Measuring Body Fat: Methods From Caliper to Navy Formula

Measuring Body Fat: Methods From Caliper to Navy Formula

Scale, caliper, bioimpedance, DEXA or circumference measurements — how reliable are the common body fat methods really? An overview of accuracy, cost and everyday practicality.

2026-07-039 min read
The US Navy Method for Body Fat Measurement Explained

The US Navy Method for Body Fat Measurement Explained

The US Navy formula estimates body fat from circumference measurements alone. We explain the formula step by step, how to measure correctly and how accurate the result really is.

2026-07-037 min read
Realistic Weight Loss: Why the Scale Doesn't Tell the Whole Story

Realistic Weight Loss: Why the Scale Doesn't Tell the Whole Story

The number on the scale fluctuates daily and doesn't measure whether you lose fat or muscle. How to track progress sensibly, set healthy goals and not let one figure discourage you.

2026-07-038 min read

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Frequently Asked Questions

There is no perfect formula, but the BMI healthy-weight range (BMI 18.5–24.9) is the best-supported reference today — which is why we show it as the recommended value. It gives a range instead of a single number, reflecting that there is no single "correct" weight. Broca and Devine are older formulas that output a single figure and ignore build and muscle mass. They are useful as a rough rule of thumb and for comparison, but less meaningful.

The Broca formula first sets normal weight as height in centimetres minus 100. At 175 cm that is 75 kg. The "ideal weight" lies below that: about 10% less for men, about 15% less for women. The formula dates from the 19th century, is easy to calculate but very imprecise — it ignores build, age and muscle share and gives unrealistic values for very tall or short people. We list it for comparison only.

The Devine formula was originally developed in 1974 for drug dosing, not as a beauty ideal. It calculates 50 kg plus 2.3 kg per inch over 152 cm (5 feet) for men, and 45.5 kg as the base value for women. Because it builds on a fixed reference height, it gives less plausible values for very tall or short people. It is still common in medicine; as a personal weight goal it should be viewed with caution.

The US Navy formula (also the Hodgdon-Beckett method) estimates body fat from waist, neck, height and, for women, the hip as well. It is remarkably practical because you only need a tape measure, but typically deviates by around 3–4 percentage points from reference methods such as DEXA. Clean measuring is key: measure loosely without pulling tight, in the morning and always at the same spot. It works well for trends over time, less so for one exact figure.

Healthy ranges differ markedly between the sexes, because women physiologically need more essential fat. Rough guidance: for men about 10–20% is a good range, for women about 18–28%. Very low values are not automatically "better" — essential fat is vital. The calculator sorts your value into categories from "essential" to "elevated". These figures are reference points, not a diagnosis; if unsure, a medical assessment helps.

The BMI only relates weight to height and says nothing about body composition. This calculator goes further: it compares several ideal-weight formulas and additionally estimates your body fat from circumference measurements. Two people with an identical BMI can have very different body fat levels — for example a muscular person versus an untrained one. That is why body fat is often more meaningful than weight alone. For the classic BMI value, use our separate BMI calculator.

No — strictly speaking, not. "Ideal weight" is an individual range, not a fixed point, and certainly not a medical requirement. Health depends on many factors: muscle mass, fitness, blood values, sleep, mental wellbeing. Two people of the same height can both be healthy at different weights. Use this calculator's figures as rough guidance, not a target. If your weight or eating behaviour is troubling you, a conversation with a doctor is a better path than a formula.

Use a flexible tape and measure on bare skin without pulling tight. Measure the neck just below the larynx, with the tape tilted slightly forward. Measure the waist at navel level with a relaxed abdomen, at the end of a normal exhale. Take the hip circumference (for women) at the widest point of the buttocks. Measure in the morning if possible and repeat each measurement two or three times to avoid reading errors. Consistency matters more than the single centimetre.