# Ideal Weight Calculator Find your ideal weight range based on height, gender, and body frame using trusted medical formulas for a healthy target. --- - **Canonical URL:** https://dothecalculation.com/calculators/ideal-weight-calculator - **Category:** Health and fitness - **Publisher:** Do The Calculation (https://dothecalculation.com) - **Cost:** Free, no account or sign-up required - **Privacy:** Runs entirely in the browser; inputs are never sent to a server - **Methodology:** https://dothecalculation.com/methodology - **Reviewed by:** Dr. Sarah Jenkins, PhD, PhD in Exercise Physiology & Metabolism, Stanford University (https://dothecalculation.com/about/team/sarah-jenkins) --- ## Calculate your healthy weight range Estimate your ideal body weight range based on height, sex, and the Devine clinical formula. - Devine formula ideal weight target - Healthy BMI-based weight range - Metric and imperial output ## The Scientific Evolution of Ideal Body Weight (IBW) The concept of an "ideal" body weight originated in the insurance industry in the early 20th century. In 1943, the Metropolitan Life Insurance Company published the first height-weight tables. These tables were developed by tracking mortality data across millions of policyholders to identify the weights associated with the longest life expectancy. While useful for general insurance risk assessment, the tables did not account for differences in body composition, age, or fat distribution. In the 1970s and 1980s, researchers developed clinical formulas to predict Ideal Body Weight (IBW). Today, clinicians utilize these formulas primarily to calculate medication dosages (especially for drugs that do not distribute into fat tissue, like chemotherapy agents or anesthetics) and estimate renal clearance, rather than as a strict measure of aesthetic or personal health. ## Classical Mathematical Formulas for Ideal Weight There are four widely recognized clinical formulas for estimating ideal body weight, all using height over 5 feet (60 inches) as their baseline and adding weight for each inch above that threshold. This calculator computes the first of these — the Devine formula — since it remains the medical dosing standard; the other three are included below for reference and comparison: **1. The Devine Formula (1974)**: The most common standard for medical dosage calculations: * Men: \(50.0\text{ kg} + 2.3\text{ kg}\) per inch over 5 feet. * Women: \(45.5\text{ kg} + 2.3\text{ kg}\) per inch over 5 feet. **2. The Robinson Formula (1983)**: A modification of Devine, designed to adjust weights slightly downward for men and upward for women: * Men: \(52.0\text{ kg} + 1.9\text{ kg}\) per inch over 5 feet. * Women: \(49.0\text{ kg} + 1.7\text{ kg}\) per inch over 5 feet. **3. The Miller Formula (1983)**: Another clinical variant that reduces the weight scaling per inch: * Men: \(56.2\text{ kg} + 1.41\text{ kg}\) per inch over 5 feet. * Women: \(53.1\text{ kg} + 1.36\text{ kg}\) per inch over 5 feet. **4. The Hamwi Formula (1964)**: Originally designed for quick clinical nutritional checks: * Men: \(48.0\text{ kg} + 2.7\text{ kg}\) per inch over 5 feet. * Women: \(45.5\text{ kg} + 2.2\text{ kg}\) per inch over 5 feet. ## Worked Step-by-Step Manual Calculation Let us calculate the ideal weight range manually for a sample profile: a male who stands \(5\text{ feet } 10\text{ inches}\) tall, using the Devine formula. Step 1: Identify height in inches over 5 feet: 10 inches. Step 2: Multiply excess inches by the Devine multiplier: \(10 \times 2.3 = 23\text{ kg}\). Step 3: Add the baseline constant for men: \(50.0 + 23 = 73.0\text{ kg}\). Step 4: Convert to pounds: \(73.0 \times 2.20462 = 160.9\text{ lbs}\). Therefore, under the Devine formula, his ideal weight is **161 lbs** (or 73 kg). This is exactly what the calculator returns for a 5'10" male; it also shows the broader healthy-BMI weight range (BMI 18.5-24.9) as additional context alongside the single-point Devine estimate. ## Limitations of Ideal Body Weight Models Ideal weight formulas are statistical predictions that do not account for muscle mass, bone density, or body frame size. A highly muscular individual will weigh significantly more than their formula-predicted ideal weight, yet possess a healthy body composition. Focus on body fat percentage and waist circumference alongside these estimates for comprehensive health planning. ## How to Use This Calculator Select your sex and enter your height in centimeters. The calculator applies the Devine formula for your sex and returns a single-point ideal weight estimate in kilograms and pounds, alongside the broader healthy weight range implied by a BMI of 18.5 to 24.9 for your height. ## Worked Example: 178 cm Male Male, height 178 cm (about 5'10"). Inches over 5 feet: \((178 / 2.54) - 60 \approx 10.06\). Devine ideal weight: \(50 + 2.3 \times 10.06 \approx 73.1\) kg (about 161 lb). Healthy BMI-range weight for this height: about **58.6 kg to 78.9 kg** — a wider, more forgiving target than the single Devine number, and a useful check since the Devine estimate itself sits comfortably inside that range. ## Related Calculators Cross-check this target against your [BMI calculator](/calculators/bmi-calculator) result, or refine it with body composition data from the [body fat calculator](/calculators/body-fat-calculator). These adult formulas don't apply to growing children — for kids, the [Kids BMI Percentile Calculator](/calculators/kids-bmi-percentile-calculator) uses age- and sex-specific CDC percentile data instead of a single target weight. ## Frequently asked questions ### What is Ideal Body Weight (IBW)? IBW is a clinical estimate of healthy body weight based on height and sex, historically used in medicine to calculate drug dosages. ### Which ideal weight formula is the best? The Devine formula is the most widely used medical standard, which is why this calculator uses it. Robinson, Miller, and Hamwi are close alternatives that shift the estimate by only a few pounds. ### How does height affect ideal weight? Formulas use 5 feet (60 inches) as a baseline, adding a set amount of weight (usually 1.4 to 2.7 kg) for each inch above that limit. ### Why do formulas differ by sex? Biologically, men have higher muscle mass and bone density, while women have higher essential body fat percentages, requiring separate calculations. ### Does this calculator apply to bodybuilders? No. The formulas do not account for muscle mass. Highly muscular individuals will exceed their predicted ideal weight but still be healthy. ### What is the Devine formula? Men: 50.0 kg + 2.3 kg per inch over 5 feet. Women: 45.5 kg + 2.3 kg per inch over 5 feet. ### What is the Hamwi formula? Men: 48.0 kg + 2.7 kg per inch over 5 feet. Women: 45.5 kg + 2.2 kg per inch over 5 feet. ### Does ideal weight change with age? These formulas do not factor in age. However, in older adults (over 65), a slightly higher weight is clinically associated with better health and resilience. ### What is the healthy BMI-based weight range? A weight range that keeps your BMI between 18.5 and 24.9, which is often broader and more realistic than single-point formulas. ### How do I determine my body frame size? Frame size can be estimated by measuring wrist circumference relative to height. This calculator does not apply a frame-size adjustment directly, but a small or large frame is a reasonable justification for leaning toward the low or high end of the healthy BMI-range weight it displays. ## Related concepts - **Devine Formula** — The standard clinical formula used to calculate ideal weight for drug dosing. - **Sarcopenia** — Age-related loss of muscle mass, altering body composition over time. - **Frame Size** — A classification of body skeleton size, adjusting weight targets. ## Related guides - [Ideal Weight Range: Height-Based Estimates and Their Limits](https://dothecalculation.com/blog/health/ideal-weight-range) — Understand ideal weight formulas, healthy BMI ranges, and why a useful weight target is usually a range, not one perfect number. - [BMI Calculation Guide: Formula, Ranges, and Limits](https://dothecalculation.com/blog/health/bmi-calculation-guide) — Calculate adult BMI by hand, understand the standard ranges, and learn why BMI is a screening measure rather than a diagnosis. ## Related calculators - [BMI Calculator](https://dothecalculation.com/calculators/bmi-calculator) — Calculate your Body Mass Index and discover your healthy weight range instantly using height and weight for accurate results. - [Body Fat Calculator](https://dothecalculation.com/calculators/body-fat-calculator) — Estimate your body fat percentage using common measurements like waist, neck, and height for a quick, accurate fitness assessment. - [Weight Loss Percentage Calculator](https://dothecalculation.com/calculators/weight-loss-percentage-calculator) — Calculate what percentage of your starting weight you have lost and check your weekly rate against the commonly cited gradual, sustainable range. - [3D Body Composition Calculator](https://dothecalculation.com/calculators/body-composition-3d-calculator) — Estimate body fat percentage, lean mass, skeletal muscle mass, and fat-free mass index (FFMI) using detailed body measurements. - [Framingham Cardiac Risk Calculator](https://dothecalculation.com/calculators/cardiac-risk-framingham-calculator) — Estimate your 10-year risk of cardiovascular disease using the trusted Framingham risk score algorithm and health factors. - [Meal Glycemic Load Calculator](https://dothecalculation.com/calculators/glycemic-load-meal-calculator) — Calculate the total glycemic load of your daily meals and see an impact classification for better blood sugar management. --- _This calculator is for educational and fitness planning purposes only. BMI classifications, metabolic rates (BMR/TDEE), body fat percentages, caloric targets, and ideal weight estimations are clinical guidelines and do not replace personalized medical advice, diagnostic evaluations, or dietetic counseling. Always consult with a licensed physician or registered dietitian before starting a new diet or intense exercise program._ --- _Source: [Do The Calculation](https://dothecalculation.com/calculators/ideal-weight-calculator). Quote freely with attribution and a link to this page._