---
title: "Ideal Body Weight Calculator"
site: ProCalc.ai
section: Health
url: https://procalc.ai/health/ideal-body-weight-calculator
markdown_url: https://procalc.ai/health/ideal-body-weight-calculator.md
date_published: 2026-04-08
date_modified: 2026-04-13
date_created: 2026-03-15
input_mode: focused
---

# Ideal Body Weight Calculator

**Site:** [ProCalc.ai](https://procalc.ai) — Free Professional Calculators
**Section:** Health
**Calculator URL:** https://procalc.ai/health/ideal-body-weight-calculator
**Markdown URL:** https://procalc.ai/health/ideal-body-weight-calculator.md
**Published:** 2026-04-08
**Last Updated:** 2026-04-13
**Description:** Free Ideal Body Weight Calculator — Calculate your ideal body weight using the Devine formula based on height and gender.

> *This file is served for AI systems and search crawlers. Human page: https://procalc.ai/health/ideal-body-weight-calculator*

## Overview
The Ideal Body Weight Calculator on ProCalc.ai gives you a quick, practical target weight based on the Devine formula, using your height and gender. You’ll see it used most often by people tracking fitness or nutrition goals, like gym-goers dialing in a cut or bulk and dietitians who want a fast reference point during a consult. A common real-world moment is when you’re setting a calorie target for a new training plan and you want a reasonable weight benchmark before you adjust macros or choose a goal rate of change. You enter your height and select your gender, then the Ideal Body Weight…

## Formula
This ideal body weight calculator uses standard health formulas to compute results. Enter your values and the formula is applied automatically — all math is handled for you. The calculation follows industry-standard methodology.

## How to Use
## What the Ideal Body Weight (IBW) Calculator does
An Ideal Body Weight Calculator estimates a reference body weight based on your **height** and sex using a standard clinical equation called **the Devine formula**. It’s commonly used in healthcare settings as a quick baseline for things like medication dosing ranges, nutrition planning, and general screening.

On ProCalc.ai, this calculator:
- Takes your height in inches
- Lets you choose male (1) or female (0)
- Outputs your ideal body weig**ht in kilograms and pounds** (rounded to 1 decimal)

Important context: Ideal body weight is not the same as “healthy weight,” “goal weight,” or “body fat percentage.” It’s a formula-based estimate, not a diagnosis.

## The Devine formula (what the calculator uses)
The Devine formula is built around a 5-**foot baseline** (60 inches). For every inch above 5 feet, it adds a fixed amount.

### Step 1: Convert your height to inches (if needed)
If you know your height in feet and inches:
- Height in inches = (feet × 12) + inches

Examples:
- 5 ft 10 in = (5 × 12) + 10 = 70 inches  
- 6 ft 2 in = (6 × 12) + 2 = 74 inches  

### Step 2: Apply the Devine formula in kilograms
Let:
- h = height in inches
- For males: IBW(kg) = 50 + 2.3 × (h − 60)
- For females: IBW(kg) = 45.5 + 2.3 × (h − 60)

So the formula always starts at:
- 50 kg at 60 inches for males
- 45.5 kg at 60 inches for females  
Then adds 2.3 kg per inch over 60 inches.

### Step 3: Convert kilograms to pounds (optional)
ProCalc.ai also converts kg to lb using:
- pounds = kilograms × 2.20462

The calculator rounds both outputs to 1 decimal place.

## How to use the ProCalc.ai inputs correctly
You’ll enter:

1) Height (inches)  
This must be a number like 64, 70, 73.5 (if you want to be very precise). Most people will use a whole number.

2) Sex selection as a numeric input  
- Male = 1  
- Female = 0  

Behind the scenes, ProCalc.ai uses that value to choose t**he correct Devine baseline** (50 vs 45.5).

## Worked examples (step-by-step)
Below are examples you can follow manually to verify the calculator output or understand what it’s doing.

### Example 1: Male, 5 ft 10 in
Given
- Height: 5 ft 10 in = 70 inches
- Sex: male

Step 1: Devine in kg
IBW(kg) = 50 + 2.3 × (70 − 60)  
= 50 + 2.3 × 10  
= 50 + 23  
= 73.0 kg

Step 2: Convert to lb
IBW(lb) = 73.0 × 2.20462  
= 160.9 lb (rounded to 1 decimal)

Result
- 73.0 kg
- 160.9 lb

### Example 2: Female, 5 ft 4 in
Given
- Height: 5 ft 4 in = 64 inches
- Sex: female

Step 1: Devine in kg
IBW(kg) = 45.5 + 2.3 × (64 − 60)  
= 45.5 + 2.3 × 4  
= 45.5 + 9.2  
= 54.7 kg

Step 2: Convert to lb
IBW(lb) = 54.7 × 2.20462  
= 120.6 lb (rounded to 1 decimal)

Result
- 54.7 kg
- 120.6 lb

### Example 3: Female, 6 ft 0 in
Given
- Height: 6 ft 0 in = 72 inches
- Sex: female

Step 1: Devine in kg
IBW(kg) = 45.5 + 2.3 × (72 − 60)  
= 45.5 + 2.3 × 12  
= 45.5 + 27.6  
= 73.1 kg

Step 2: Convert to lb
IBW(lb) = 73.1 × 2.20462  
= 161.2 lb (rounded to 1 decimal)

Result
- 73.1 kg
- 161.2 lb

## How to interpret your IBW result (without overreading it)
Think of IBW as a reference point, not a target you must hit.

IBW is often used alongside other measures, such as:
- BMI (Body Mass Index): weight relative to height (doesn’t directly measure body fat)
- Waist circumference: a proxy for central fat distribution
- Body composition: lean mass vs fat mass
- Clinical context: age, training status, pregnancy, and medical conditions

Two people with the same height and sex can have very different healthy weights depending on muscle mass, bone structure, and overall body composition. For example, strength-trained individuals often weigh more than IBW while still being metabolically healthy.

## Pro Tips for getting the most useful result
- Use accurate height. A 1-inch difference changes IBW by 2.3 kg (about 5.1 lb). If you’re between heights, measure rather than guess.
- Keep units consistent. The calculator expects inches. If you only know centimeters, **convert first** (1 inch = 2.54 cm), then enter inches.
- Use IBW for planning ranges, not precision. Many real-world uses (like nutrition targets) work better with a range around IBW rather than a single number.
- Pair it with context. If you’re using IBW for fitness goals, consider adding a body fat estimate or waist measurement so you’re not chasing an arbitrary scale number.
- Remember the baseline is 5 feet. The Devine formula is structured around 60 inches; it adds (or subtracts) based on how far you are from that point.

## Common mistakes (and how to avoid them)
1) Entering centimeters instead of inches  
If you enter 170 thinking it’s centimeters, the calculator treats it as inches, producing an unrealistic result. Convert first:
- inches = centimeters ÷ 2.54

2) Mixing up feet and inches  
Typing “5.10” to mean 5 ft 10 in is a **classic error**. The calculator needs total inches:
- 5 ft 10 in = 70 inches, not 5.10

3) Selecting the wrong sex input (1 vs 0)  
ProCalc.ai uses numeric values:
- male = 1
- female = 0  
If you flip it, the result shifts by 4.5 kg (about 9.9 lb) at the same height because the baseline differs (50 vs 45.5).

4) Assuming IBW equals a healthy weight for everyone  
IBW is a **formula estimate**. It does not account for muscle mass, body frame size, or fat distribution. Treat it as a reference, not a verdict.

5) Over-focusing on a single number  
Health outcomes usually track better with trends (habits, waist size, fitness, lab markers) than with hitting one computed weight.

By understanding the Devine formula, entering height in inches, and interpreting the output as a reference (not a mandate), you’ll get the most practical value from ProCalc.ai’s Ideal Body Weight Calculator.

## Authoritative Sources

This calculator uses formulas and reference data drawn from the following sources:

- [CDC — Physical Activity](https://www.cdc.gov/physical-activity/)
- [NIH — National Institute of Diabetes](https://www.niddk.nih.gov/)
- [NIH — National Heart, Lung, and Blood Institute](https://www.nhlbi.nih.gov/)

## Frequently Asked Questions

### How does the ideal body weight calculator work?
Enter your values into the input fields and the calculator instantly computes the result using standard health formulas. No sign-up required — results appear immediately as you type.

### How accurate is this ideal body weight calculation?
This calculator uses clinically validated formulas widely accepted in health and fitness. Individual results may vary based on factors like body composition, age, and activity level. For medical decisions, always consult your healthcare provider.

### Should I use metric or imperial measurements?
Use whichever system you are most comfortable with. The calculator handles the math the same way regardless of unit system. Just make sure all your inputs use the same system for accurate results.

### How often should I recalculate?
For body metrics that change over time (weight, body fat, BMI), recalculating every 2-4 weeks gives you a good picture of trends without obsessing over daily fluctuations.

### Is this ideal body weight calculator free to use?
Yes, completely free with no sign-up required. Use it as many times as you need. Results are calculated instantly in your browser — your data is never stored or shared.

### What is ideal body weight (IBW)?
Ideal body weight (IBW) is an estimated weight range based primarily on height and sex, originally developed for clinical dosing and reference purposes. It is not the same as a “goal weight” and does not directly measure body fat, muscle mass, or health status. IBW is best used as a rough benchmark alongside other metrics.

### Ideal body weight vs BMI — what’s the difference?
Ideal body weight is a single estimated weight value derived from height (and typically sex) using a formula. BMI (body mass index) is a ratio of weight to height that places you into categories (e.g., underweight, normal, overweight) and can be calculated for any adult weight. Both are screening tools and can be misleading for very muscular people, older adults, or those with atypical body composition.

### Can I use this ideal body weight calculator for pregnancy or breastfeeding?
IBW formulas are not designed for pregnancy or postpartum changes, so the result should not be used to set weight targets during pregnancy or breastfeeding. Pregnancy weight guidance is typically based on pre-pregnancy BMI and trimester-specific recommendations. For individualized targets, use prenatal guidelines or consult a clinician.

## Sources
- [NIH](https://www.nih.gov)
- [WHO](https://www.who.int)
- [CDC](https://www.cdc.gov)

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## Reference
- **Calculator page:** https://procalc.ai/health/ideal-body-weight-calculator
- **This markdown file:** https://procalc.ai/health/ideal-body-weight-calculator.md

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### How to Cite
> ProCalc.ai. "Ideal Body Weight Calculator." ProCalc.ai, 2026-04-08. https://procalc.ai/health/ideal-body-weight-calculator

### License
Content © ProCalc.ai. Free to reference and cite. Do not republish in full without attribution.