Ideal Weight Calculator

Use our free ideal weight calculator to see your ideal weight from all four medical formulas, plus your healthy BMI range. Enter your current weight to see exactly where you stand.

Calculate Your Ideal Weight

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What Is Ideal Weight?

Ideal weight is a number produced by a formula, not a verdict on your health. The four formulas on this page were built for clinical drug dosing and dietary planning, not as personal health targets. They use only your height and gender, so none of them know your muscle mass, your frame size, or your body composition. Two people with the same height can have the same ideal weight on paper and very different healthy bodies in real life.

That is why this ideal weight calculator shows all four formulas side by side, plus a healthy BMI range. The range matters more than any single number, because health lives in a zone, not on one point. Use the average as a reference, check where your current weight falls inside the range, and judge the result together with your energy, strength, blood pressure, blood sugar, and body composition.

How This Ideal Weight Calculator Works

Enter your gender, age, height, current weight, and frame size, then press Calculate. This ideal weight calculator converts your height to inches, applies each of the four formulas, averages the four results, and compares your current weight with the healthy BMI range for your height.

FormulaMenWomenYear
Hamwi48 + 2.7 per inch over 5 feet45.5 + 2.2 per inch over 5 feet1964
Devine50 + 2.3 per inch over 5 feet45.5 + 2.3 per inch over 5 feet1974
Robinson52 + 1.9 per inch over 5 feet49 + 1.7 per inch over 5 feet1983
Miller56.2 + 1.41 per inch over 5 feet53.1 + 1.36 per inch over 5 feet1983

Each formula starts from a base weight at 5 feet tall and adds a fixed amount for every inch above that height. Because the four formulas were built in different eras for different purposes, they rarely agree exactly. The average of the four is a practical midpoint that smooths out their differences, and it is the number this ideal weight calculator highlights.

Frame size adjusts the average. A small frame subtracts 10 percent, a large frame adds 10 percent, and a medium frame leaves the average unchanged. The result is labeled frame-adjusted when you choose a small or large frame, so you always know what went into the number.

Ideal Weight vs Healthy Weight Range

A single ideal weight number is less useful than a range. Bodies vary in muscle, bone density, and fat distribution, so a healthy weight for one person can look different for another person of the same height. The healthy BMI range of 18.5 to 24.9 gives you that range. Multiply each end by your height in meters squared to get your healthy weight range in kilograms.

BMI has a well known blind spot: it cannot tell muscle from fat. A muscular person can have a high BMI with a low body fat percentage, while someone with little muscle can have a normal BMI and a high body fat percentage. That is why it helps to check your body fat percentage and your waist-to-height ratio, a measure that a meta-analysis found screens cardiometabolic risk better than BMI alone. Use the ideal weight number as a starting point, then confirm it with these measures.

Worked Example

Here is a worked example using the default values in this ideal weight calculator. A 30-year-old man is 175 cm tall, weighs 75 kg, and has a medium frame.

At 175 cm, he is 68.9 inches tall, or 8.9 inches over 5 feet. The formulas give Hamwi 72.0 kg, Devine 70.5 kg, Robinson 68.9 kg, and Miller 68.7 kg, for an average ideal weight of 70.0 kg. His healthy BMI range is 56.7 to 76.3 kg. His current weight of 75 kg sits within the healthy range, and it is 5.0 kg above the average ideal weight.

That result does not mean he must lose 5.0 kg. He is inside the healthy range, so the sensible question is how he feels, how he performs, and what his other health markers show. If he is active, strong, and his markers look good, his current weight is a reasonable place to stay.

Common Ideal Weight Calculator Problems (And How to Fix Them)

Most confusing results from an ideal weight calculator come from the formulas themselves, not from a mistake in your inputs. Here are the five problems we see most often, and how to fix each one.

  1. Different calculators give different numbers. This is normal. The formulas disagree by 5 kg or more for the same person, because they were built in different eras for different purposes. Look at the range and the average, not one calculator in isolation.
  2. It says overweight but I am muscular. The formulas ignore muscle completely. A lifter can read as overweight while being lean and healthy. Check your body fat percentage and waist measurements before you act on the number.
  3. Should I aim for exactly the ideal number? No. Treat it as a reference inside a range. Health markers like blood pressure, blood sugar, energy, and strength matter more than hitting one number exactly.
  4. The ideal weight seems too low. The formulas come from old clinical and insurance data, and they can understate what a healthy weight looks like for a strong or broad-framed person. The healthy BMI range is the better target in that case.
  5. I am below the ideal weight and worried. A modest calorie surplus with strength training and enough protein builds healthy weight. Focus on adding muscle, not just scale weight, and recheck after a few weeks.

What To Do With Your Result

If your current weight is above the healthy range, a modest calorie deficit plus strength training is the sustainable way down. Eating enough protein protects muscle while you lose fat, so the weight you drop comes mostly from fat.

Start with the calorie deficit calculator to set your daily intake, then use the protein intake calculator to set your daily protein target. The body fat percentage calculator will help you track whether the weight you lose is fat or muscle.

If your weight is inside the healthy range, your goal may be maintenance, strength, or a slow recomposition rather than weight loss. Re-check every few weeks, and adjust only when the trend is flat for a month or your health markers move the wrong way.

Frequently Asked Questions

What is my ideal weight?

It depends on the formula. The four medical formulas give a small range, not one number. Use their average plus the healthy BMI range as your target zone.

Why do different calculators give different answers?

The four formulas come from different eras and purposes and routinely disagree by 5 kg or more for the same person. That disagreement is normal, which is why this calculator shows all four.

Is ideal weight the same as healthy weight?

No. Ideal weight is a single number from clinical dosing formulas. Healthy weight is a range tied to metabolic markers like blood pressure, blood sugar, and body fat.

Should I aim for exactly my ideal weight?

No. Muscular people can be healthy above it, and health markers matter more than hitting one number. Treat it as a reference point inside a range.

Does ideal weight change with age?

The formulas do not use age, but muscle and bone change as you age. Focus on staying inside the healthy range rather than chasing a number from your twenties.

What if I am muscular?

The formulas ignore muscle completely. A lifter can read as overweight while having a healthy body fat percentage. Use body fat percentage and waist measurements instead.

What is the BMI healthy range?

18.5 to 24.9. Multiply each by your height in meters squared to get your healthy weight range in kg.

How do I reach my ideal weight?

If above the range, a modest calorie deficit with strength training and enough protein. If below it, a modest surplus the same way. The calorie deficit and protein calculators on this site set the numbers.

Which formula is most accurate?

None is accurate as a health target. Devine is the most used in clinical practice. The average of all four smooths out their differences.

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