Weight Calculator — Your Ideal Body Weight Range

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Height in Centimeters

Current Weight in Kg

Gender

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AI Summary & Key Formula

Weight Calculator Quick Reference

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Quick Answer

An ideal weight calculator gives a single reference weight from the Devine formula — 50 kg for men or 45.5 kg for women, plus 2.3 kg for every inch of height above 5 feet — alongside the WHO healthy range of BMI 18.5–24.9 for your height. For example, a man 178 cm tall (about 5 ft 10 in) has a Devine ideal weight of 73.2 kg and a healthy range of 58.6–78.9 kg. The Devine figure was designed for clinical drug dosing, so the range is the more practical target; neither number accounts for muscle mass, frame size or age.

How This Calculation Works

Values calculate dynamically in real-time as you enter figures or adjust sliders.
The equation on the right is exactly what the calculator runs — check any result by hand.

Core Equation

Devine Formula (1974):
  Men:   IBW = 50 kg + 2.3 kg per inch over 5 feet
  Women: IBW = 45.5 kg + 2.3 kg per inch over 5 feet

Healthy Range (WHO BMI 18.5–24.9):
  18.5 × height(m)² to 24.9 × height(m)²

How to Use the Weight Calculator

Quick 3-step guide for accurate and fast calculations

STEP 01

Enter your height in centimeters

In the Weight Calculator, fill in Height in Centimeters, Current Weight in Kg and Gender.

STEP 02

Read your ideal weight (devine formula)

The Weight Calculator instantly shows Ideal Weight (Devine Formula), Healthy BMI Minimum (18.5), Healthy BMI Maximum (24.9) and Current Weight in Pounds (lbs), updating as you type.

STEP 03

Compare scenarios

Change Current Weight in Kg to see how it affects Ideal Weight (Devine Formula), then check the formula below to verify the math.

Specific Instructions:

Enter your height in centimetres, your current weight in kilograms and your biological sex, since the Devine formula uses a different base for men and women. The result shows your Devine ideal body weight, the healthy weight range for your height (BMI 18.5–24.9), your current weight in pounds and how far you are above or below the Devine figure.

Weight Calculator Formula

The Weight Calculator uses the following formula, calculated in your browser as you change the inputs:

Devine Formula (1974): Men: IBW = 50 kg + 2.3 kg per inch over 5 feet Women: IBW = 45.5 kg + 2.3 kg per inch over 5 feet Healthy Range (WHO BMI 18.5–24.9): 18.5 × height(m)² to 24.9 × height(m)²

Sources:

Worked Example: Weight Calculator

Male, Height: 178 cm (≈ 5 ft 10 in) Height in inches = 178 / 2.54 = 70.08 → 10.08 inches over 5 ft IBW (Devine) = 50 + 2.3 × 10.08 = 73.2 kg Healthy Range (BMI 18.5–24.9): 58.6 kg – 78.9 kg

Calculations run in your browser — your inputs are never stored on our servers.Formula sources & methodology

Guide

BMI Chart and Healthy BMI Ranges for Adults

For adults, the World Health Organization classifies a BMI below 18.5 as underweight, 18.5 to 24.9 as normal weight, 25 to 29.9 as overweight and 30 or above as obese. BMI is your weight in kilograms divided by your height in metres squared, so a person who weighs 70 kg and is 1.75 m tall has a BMI of about 22.9, which is in the healthy range.

Frequently Asked Questions — Weight Calculator

What is ideal body weight?

Ideal body weight (IBW) is an estimated weight considered optimal for your height and sex based on population health studies. It serves as a reference point for assessing weight-related health risks and calculating medication doses. IBW formulas like Devine and Hamwi are widely used in clinical settings.

Is ideal body weight the same as healthy weight?

Not exactly. Ideal body weight is a single number from a formula, while healthy weight is a range: this calculator uses the WHO healthy BMI band of 18.5 to 24.9 for your height. For a man 178 cm tall, the Devine ideal is 73.2 kg but the healthy range runs from 58.6 kg to 78.9 kg, so anyone inside that band is in a healthy BMI range. Health professionals often look at both, plus waist size.

Should athletes aim for ideal body weight?

Usually not. Athletes, bodybuilders and other highly muscular people often weigh more than their Devine ideal because muscle is dense, and forcing weight down to the formula figure can hurt performance and health. For them, body composition — body fat percentage or waist circumference — and how they perform and feel are more useful guides than a single formula weight. A sports dietitian or doctor can set a sensible target range.