Healthy Weight Calculator

The least clever tool here, and the most honest

This calculator does almost nothing. You give it your height and it gives you a range of kilograms. There is no equation named after a doctor, no percentage to type, no activity level. It is the simplest tool in this entire section.

It is also, we would argue, the only one that answers the question people actually came to ask.

Our Ideal Body Weight Calculator will give you four precise figures from four named formulas, and if you read that page you will find out that three of them were invented by pharmacists to calculate antibiotic doses. They are not health targets and were never meant to be. This tool has no such backstory. It takes the healthy BMI range, the one built from actual research into weight and health outcomes, and turns it back into kilograms for your height.

That is it. No cleverness. Just the range, honestly reported, with nothing dressed up.

Your healthy weight is a twenty-kilogram window

Here is the thing worth taking away from this page, and it surprises almost everyone.

Take someone 175 cm tall. That is 1.75 m, so 1.75 squared is about 3.06. Multiply by each edge of the healthy BMI range:

Lower edge: 18.5 × 3.06 ≈ 57 kg
Upper edge: 25 × 3.06 ≈ 77 kg

Fifty-seven to seventy-seven kilograms. Twenty kilograms wide. Three stone.

Sit with that for a moment, because it cuts against nearly everything else you will read about weight. There is no single correct weight for a person 175 cm tall. There is a window, and it is enormous, and every point inside it is a healthy weight. Somebody at 58 kg and somebody at 76 kg are both, as far as this measure is concerned, exactly as fine as each other. They would look like very different people standing next to one another. They are both in the range.

Now put that next to the tools that hand you a single number. Our ideal body weight page gives a 180 cm man four figures spread across about six kilograms, and people agonise over which of the four to chase. Six kilograms of argument, inside a window that is twenty kilograms across. It is like arguing about which brick in a wall is the wall.

If you take one thing from this page: your healthy weight is not a number you are missing. It is a room you are probably already standing in.

Where the two edges came from

The window is wide, but it does have walls, and they are not arbitrary.

The range is the standard adult BMI classification used by the World Health Organization and the CDC. BMI itself is simply your weight in kilograms divided by your height in metres squared, and this tool just runs that backwards: give it a height and a target BMI and it returns the weight that would produce it.

The edges sit where they do because that is roughly where health risks start climbing at both ends. Below 18.5 the concerns are the ones that come with being underweight: bone density, immune function, fertility, and for older people, a poor reserve to fall back on during illness. Above 25 the risks are the familiar metabolic and cardiovascular ones, and they rise gradually rather than switching on at the line.

That word gradually matters. Crossing from 24.9 to 25.1 does not change anything about you. The categories are administrative lines drawn across a smooth gradient, useful for populations and blunt for individuals. Being a kilogram over the top of your window is not a medical event.

One honest note while we are here. If you are of South Asian, East Asian or South East Asian descent, there is good evidence that weight-related risk appears at lower BMI values, and several countries use a lower overweight threshold of around 23 rather than 25 for exactly this reason. This tool uses the standard international range, so if that applies to you, read the upper edge as generous. Our BMI Calculator covers the detail.

Why it only asks one question

You may have noticed it does not want your age, your sex, or your current weight. That is not laziness, and it is worth understanding what it means.

The healthy weight range for a given height is the same range regardless of who is standing at that height. A 25 year old woman and a 60 year old man of the same height have the same window. This is genuinely different from the ideal weight formulas, which all produce different numbers for men and women, and it is one of the reasons BMI has survived while so much else has not: it makes fewer assumptions about you.

It also means the tool is not judging you. It does not know your weight, so it cannot tell you that you are wrong. It shows you where the walls are and leaves the rest alone. If you want the comparison, our BMI Calculator will tell you where you currently sit, and our How Much Weight Should I Lose tool will do the subtraction.

And here is the limitation that follows directly from the simplicity. Height is all it knows, so it cannot tell muscle from fat. A serious lifter can be above the window and in excellent health, because the window has no way of asking what you are made of. Our Lean Body Mass Calculator and Body Fat Calculator ask that question properly. A tool with one input buys you honesty and costs you nuance, and it is worth knowing which you have been handed.

What to do if you are inside it, and if you are not

If you are inside the window, you are done. That is the whole message. There is no bonus for moving toward the middle, and no prize at the bottom edge. A BMI of 24 is not a worse result than a BMI of 19; they are two places in the same room. If you want to change your body for reasons of how you look or how you perform, that is a completely legitimate thing to want, but be honest with yourself that it is a different project from health, because on the health question this tool has already answered you.

If you are above it, the useful thing to know is that you do not have to cross back inside to get most of the benefit. The research is fairly consistent that losing 5 to 10 percent of your body weight produces meaningful improvements in blood pressure, blood sugar and cholesterol, and that is usually a fraction of the distance to the edge of the window. Aim there first. Our How Much Weight Should I Lose page goes into the evidence.

If you are below it, that is worth taking as seriously as being above it, and people rarely do. Being underweight carries real risks, and if you did not intend to be there, it is worth a conversation with a doctor rather than a calculator, because unintentional weight loss has causes that no meal plan will fix. Our Weight Gain Calculator covers the deliberate version.

Questions people ask

What is my single healthy weight?

You do not have one, and that is the honest answer rather than a dodge. You have a range roughly twenty kilograms wide, and every weight inside it is healthy.

Why does this disagree with your Ideal Body Weight Calculator?

Because they are doing different things. This tool reports the healthy BMI range, which comes from research into health outcomes. That one reports four formulas invented for calculating drug doses. This is the one to trust for the question you are asking.

Should I aim for the middle of the range?

There is no particular reason to. The middle is not healthier than the edges; it is just the middle. Aim for a weight you can hold without misery.

I am muscular and the range says I am overweight.

Then the range is wrong about you. It only knows your height and cannot tell muscle from fat. Use body composition instead of the scale.

Does my healthy weight change as I get older?

The range does not move, since it is based on height alone. There is some evidence that a slightly higher BMI is not harmful and may be protective in older adults, so the top edge is worth reading generously past about 65.

References

Where the figures come from. The healthy BMI range of 18.5 to 25 for adults is the standard classification published by the CDC, following the World Health Organization. The evidence that losing 5 to 10 percent of body weight produces clinically meaningful improvements comes from Wing and colleagues' analysis of the Look AHEAD study. The lower risk thresholds for Asian populations were set out by a WHO expert consultation in The Lancet.

1. Centers for Disease Control and Prevention. About Body Mass Index (BMI). https://www.cdc.gov/bmi/about/
2. Wing RR, Lang W, Wadden TA, et al. Benefits of modest weight loss in improving cardiovascular risk factors in overweight and obese individuals with type 2 diabetes. Diabetes Care. 2011;34(7):1481-1486. https://pmc.ncbi.nlm.nih.gov/articles/PMC3120182/
3. WHO Expert Consultation. Appropriate body-mass index for Asian populations and its implications for policy and intervention strategies. The Lancet. 2004;363(9403):157-163. https://doi.org/10.1016/S0140-6736(03)15268-3