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Ideal Weight Calculator
See the healthy weight range for your height based on BMI, with Broca's formula for comparison. Free, no signup, runs on your device.
Important — read before acting on this
This calculator is an estimation and early-screening aid only, NOT a substitute for diagnosis or professional medical advice. For your own health, consult a doctor or qualified health professional.
Based on: WHO Asia-Pacific, Depkes RI, Mifflin-St Jeor (1990), Naegele's rule. Checked: 2026-07-16.
Your healthy weight range
Ideal weight is a range, not a single number. Two people of the same height can be healthy at different weights because muscle mass, frame, and body composition differ. That's why a BMI-based range is medically preferred over a single formula like Broca's — Broca appears here only as a familiar comparison, not because it's more accurate.
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Why a range, not a number
The BMI-based range
The medically preferred method: the healthy BMI range (18.5–22.9 under WHO Asia-Pacific) times height in metres squared. The result is a range, not a number — because no single weight is healthy for everyone of your height.
Broca's formula
An older rule still widely quoted in Indonesia: (height cm − 100), minus 10% for men and 15% for women. Simple and memorable, but it yields one figure and lacks the population basis of the BMI range. Shown here for comparison, not as a target.
Why they differ
Broca often lands near the lower end of the BMI range, especially for women. The gap is expected — they're built on different assumptions. A difference doesn't mean one is wrong; it's a reminder that ideal weight is a range, not a point.
FAQ
Frequently asked questions
How is ideal weight calculated?
The preferred method uses the healthy BMI range: multiply 18.5 and 22.9 by height (in metres) squared. At 165 cm: 18.5 × 2.7225 = 50.4 kg lower bound, 22.9 × 2.7225 = 62.3 kg upper. So the healthy range is roughly 50.4 to 62.3 kg. The calculator also shows Broca's figure for comparison.
What is Broca's formula, and is it still relevant?
Broca gives (height cm − 100), minus 10% for men or 15% for women. At 165 cm that's about 58.5 kg for men and 55.25 kg for women. It's still widely used in Indonesia for its simplicity, but yields a single number and ignores individual variation. The BMI range is medically preferred; Broca is a quick comparison.
Why is ideal weight a range?
Because two people of the same height can be healthy at different weights. Muscle mass, frame, and composition all shape what's healthy for a given person. A muscular athlete can sit above the range with no issue, while someone with low muscle can sit inside it with less favourable composition. A range is more honest than a single figure.
My weight is outside the range — is that a problem?
Not necessarily, and this calculator can't answer that. The range is population-level guidance, not an assessment of your health. Blood pressure, blood glucose, lipids, fitness, sleep, and daily habits all matter more. If you have concerns, speak with a doctor or dietitian who can see the whole picture rather than one number.
Is the range the same for men and women?
The BMI-based range doesn't differ by sex, because the BMI formula doesn't. Broca does, subtracting 10% for men and 15% for women. In practice body composition does differ between men and women, particularly in healthy body fat percentage — something neither BMI nor Broca captures. That's a limitation of both.
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