Healthy Weight Calculator

Where these three numbers come from

All three formulas take your height, note how far it is above five feet, and add a fixed amount per inch. They differ only in where they start and how much each inch is worth:

Two things follow from that table. The first is that none of them were designed to tell you how to look. Devine’s equation was written to size a dose of gentamicin. They spread into fitness culture afterwards, and the authority they carry there is largely borrowed.

The second is that they disagree with each other. How much, and which one reads highest, depends on how tall you are: Hamwi starts lowest but climbs fastest, Robinson starts highest and climbs slowest, and their lines cross somewhere around 5′4″. Above and below that crossing point the gap widens again. That disagreement is the honest signal here — three careful attempts at the same question landed in different places, which tells you the question has a range for an answer rather than a number.

Only Hamwi carries a frame adjustment: subtract 10% for a small frame, add 10% for a large one. Devine and Robinson were published without one, so changing the frame selector moves a single row.

Ideal weight vs. goal weight

Ideal weight is what a formula says. Goal weight is what you decide. They are not the same thing, and conflating them is how a person ends up dieting toward a number that was never meant for them.

The clearest way to see the gap is on the bar in the results panel. The green band is every weight that counts as healthy at your height — a BMI between 18.5 and 24.9, which at 5′10″ runs from about 129 lb to 174 lb. The orange sliver inside it is what the three formulas return. It is a small slice of a much larger space, and there is nothing wrong with the rest of that space.

A goal weight worth chasing is one that:

• Sits somewhere in the healthy band rather than at the bottom edge of it. The bottom is not a prize.
• Accounts for the muscle you have or want.If you’ve been lifting for years, the formulas are reading your lean mass as excess weight.
• You can hold without white-knuckling it. A weight that requires permanent hunger to maintain is a weight you will not maintain. The maintenance calorie calculator shows what living at a given weight actually costs per day.
• Is a checkpoint, not a destiny. Body composition keeps changing after the scale stops.

If you already have a goal weight in mind, the calorie deficit calculator turns the gap between it and your current weight into a daily calorie target and a projected date.

How to find your frame size

Frame size is a rough proxy for skeletal width — the reason two people of identical height can carry visibly different amounts of bone and still both be lean. The standard method measures wrist circumference at its narrowest point, just below the wrist bone, and reads it against height.

Wrist circumference is measured in inches, and the published men’s table only covers heights over 5′5″. If you fall outside it, or your wrist sits on a boundary, medium is the sensible default — it is the unadjusted formula, and the adjustment is only 10% in either direction.

Why BMI is limited for athletes

BMI divides your weight by the square of your height. That is the whole calculation. It has no way to ask what the weight is made of, and muscle is denser than fat — so the more of it you carry, the more the number overstates your risk.

This is not a rare edge case. A rugby forward, a powerlifter, and a sprinter can all sit in the “overweight” band at single-digit body fat. Nothing about the calculation is broken; it is answering a question about populations while you are asking one about a person.

The failure runs in both directions, which is the part people miss:

• Muscular bodies read as overweight. The extra weight is lean mass, and the formulas count it against you. Every ideal-weight formula on this page inherits the same flaw — they also know nothing but your height.
• Undermuscled bodies read as healthy at any composition. A person can sit at a BMI of 23 with very little muscle and a lot of fat. The scale is content and the composition is not.

The fix is to stop asking the scale a question it cannot answer. Measure body fat percentage instead — the Navy body fat calculator needs a tape measure and two minutes, and the body fat percentage calculator plots your result against the full range for your sex. For the longer argument about when each number earns its keep, body fat % vs. BMI works through where each one breaks. If you want the age-adjusted picture, body fat percentage by age has the full chart.

If you lift and the number still bothers you: a BMI calculator is a screening tool for populations. It was never a verdict on a body, and it is least useful on exactly the bodies that have trained hardest.

How to reach your healthy weight range

If your weight sits outside the healthy band and you’ve decided to move it, the mechanism is unglamorous and well understood. Nothing below is medical advice, and individual responses vary — if you’re managing a medical condition, pregnant or breastfeeding, or considering a very low-calorie diet, that is a conversation for a clinician.

1. Find your maintenance calories first. Every target is measured against that baseline. The TDEE calculator for weight loss estimates what you burn and subtracts a deficit you pick.
2. Choose a pace you can hold for months.Weekly loss near 0.5–1% of body weight is the usual ceiling. Beyond it, a growing share of what you lose is lean mass — the exact tissue that makes a healthy weight look and feel healthy. The weight loss pace calculator grades a timeline before you commit to it.
3. Set a protein floor and defend it. Protein is what signals your body to keep muscle while calories are low, and it does more for fullness per calorie than fat or carbs. The protein calculator sizes the floor.
4. Lift something heavy twice a week. A deficit without resistance training takes muscle along with the fat. This is the difference between weighing less and looking different.
5. Judge the trend, not the morning. Water, glycogen, and sodium move the scale several pounds in either direction independent of fat. Weigh often if you like; read only the weekly average.
6. Plan the landing. A deficit is a phase. Knowing where to settle — and eating there deliberately — is what keeps a healthy weight from being a place you visit once.

Underweight is the mirror image and deserves the same seriousness. A BMI under 18.5 that you did not choose is worth raising with a clinician rather than solving with a calculator.

Frequently asked questions