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). The coefficients are those printed in a review of ideal-body-weight equations.1 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.
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.
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.
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.
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.
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.
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.1 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 for dosing math.
Healthy BMI Weight Range
BMI (body mass index) compares your weight to your height. Health agencies put the normal BMI range at 18.5 to 24.9, with overweight starting at 25.0, and this calculator uses 24.9 as the top of the band.2 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.
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 gives 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.
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 even a modest share of your body weight can lower blood pressure, blood sugar, and cholesterol; the National Heart, Lung, and Blood Institute's guide sets an initial goal of about 10 percent.2
A safe pace is about 1 to 2 pounds per week, which the same guide ties to eating 500 to 1,000 fewer calories a day than you burn.2 That is roughly 0.5 to 1 kg a week, alongside regular walking, strength work, and good sleep. Slow, steady change is easier to keep than a crash diet.
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.