Introduction
The Healthy Weight Calculator shows you a weight range that fits your height, sex, and age. Type in your height in feet and inches or in centimeters, pick male or female, and add your age. The tool then gives you a healthy weight in both pounds and kilograms.
This calculator uses four trusted ideal body weight formulas: Hamwi (1964), Devine (1974), Robinson (1983), and Miller (1983). Each one gives a slightly different number because each was built from a different group of people. We show all four, plus the average, so you can see the full picture instead of one single number. If you want to work with a single formula on its own, the Ideal Body Weight Calculator breaks each one down separately.
You also get your healthy BMI weight range, based on a BMI of 18.5 to 25. A chart, a range bar, and step-by-step math help you see how each number was found. To check your current number against that band, run it through the BMI Calculator.
Keep in mind that these numbers are a guide, not a rule. They do not measure muscle, bone, or body fat. An athlete with lots of muscle may weigh more and still be healthy. Use this tool as a starting point, then talk with your doctor about the right weight goal for you.
How to use our Healthy Weight Calculator
Enter your unit system, sex, age, and height. The calculator shows your healthy weight from four ideal body weight formulas, their average, and your healthy BMI weight range in both pounds and kilograms.
Unit System: Pick "US / Imperial" to type your height in feet and inches, or pick "Metric" to type it in centimetres. Weight results always show both pounds and kilograms. If you need to switch units by hand, the Pounds to Kilograms Calculator and the Cm to Inches Calculator can help.
Biological Sex: Choose Male or Female. Each choice uses its own set of formula numbers, so the results change.
Age (years): Type your age as a whole number from 2 to 80. Age does not change the math, but it flags notes for kids under 18 and adults 65 and older. Not sure of your exact age in years? Check it with the Age Calculator.
Height (feet and inches): In US mode, type your feet in the first box and your inches in the second. You can use decimals for inches, like 10.5. You can also see where your height sits among adults using the Height Percentile Calculator.
Height (cm): In Metric mode, type your height in centimetres, such as 177.8. Decimals are fine.
Calculate and Reset: Click Calculate to see your results, chart, and step-by-step math. Click Reset to clear your entries and start again.
What Is a Healthy Weight?
A healthy weight is a weight range that keeps your body working well and lowers your risk of problems like type 2 diabetes, high blood pressure, and heart disease. There is no single perfect number. Your height, frame size, muscle, age, and health history all change what is right for you. Body shape matters too, which is why some people also check the Body Type Calculator alongside a weight range.
Ideal Body Weight (IBW) Formulas
Doctors have used simple math formulas for years to guess a healthy weight from height and sex. Each one starts with a base weight for a person who is 5 feet (60 inches) tall, then adds weight for every inch above that. Because each formula came from a different study and time period, they give slightly different answers.
- Hamwi (1964) – the oldest formula, first made to help set food plans for people with diabetes.
- Devine (1974) – built to help set medicine doses. It is still the most common one in hospitals.
- Robinson (1983) – a newer update of Devine that gives lower numbers.
- Miller (1983) – has a higher starting weight but adds less per inch.
Averaging all four gives a smoother middle number instead of trusting just one formula. In clinical settings where a patient weighs far more than their IBW, staff often switch to the Adjusted Body Weight Calculator or the Lean Body Weight Calculator for dosing math.
Healthy BMI Weight Range
BMI (body mass index) compares your weight to your height. The World Health Organization calls a BMI of 18.5 to 25.0 the healthy range. Turning that range into pounds or kilograms gives you a weight range instead of one target. Most people do well somewhere inside it. People with more muscle or bigger bones often sit near the top of the range. Sex-specific versions are available in the Female BMI Calculator and the Male BMI Calculator, and growing kids should use the Child BMI Calculator instead.
What BMI and IBW Miss
These numbers only use height and weight. They cannot tell muscle from fat, and they do not look at where fat sits on your body. That means:
- Athletes with heavy muscle may look "overweight" on paper but be very healthy. The Body Fat Calculator and the FFMI Calculator give a clearer read for muscular builds.
- Older adults may lose muscle and look fine on paper while carrying too much fat.
- Belly fat matters a lot for health risk, so waist size is a useful second check. Try the Waist to Height Ratio Calculator, the Waist to Hip Ratio Calculator, or the Visceral Fat Calculator.
Losing Weight in a Safe Way
If you are above your healthy range, you do not need to hit the exact ideal number to feel better. Losing just 5% to 10% of your body weight can lower blood pressure, blood sugar, and cholesterol. Use the Weight Loss % Calculator to track that share as you go.
A safe pace is about 1 to 2 pounds (0.5 to 1 kg) per week. That usually means eating about 500 fewer calories a day than you burn, along with regular walking, strength work, and good sleep. Start with your BMR Calculator and TDEE Calculator numbers, set your gap with the Calorie Deficit Calculator, and map a timeline with the Weight Loss Calculator or the Weight Loss Calorie Calculator. Splitting those calories into protein, carbs, and fat is easy with the Macro Calculator and the Protein Calculator. On the activity side, the Calories Burned Calculator and the Steps to Calories Calculator show what your movement adds. Slow, steady change is easier to keep than a crash diet. If you need to gain rather than lose, use the Weight Gain Calculator.
When to Ask a Professional
Talk to a doctor or dietitian before starting a weight plan if you are under 18, over 65, pregnant, breastfeeding, taking medicine that changes weight, or living with a health condition. They can look at your body fat, muscle, blood work, and habits, which no formula can do. Expecting parents can follow the Pregnancy Weight Gain Calculator, and service members should check the standards in the Army Height and Weight Calculator.