Ideal Weight Calculator: Find Your Healthy Weight Range
There is no single "ideal" weight — it depends on your height, frame, muscle mass, and goals. This calculator provides estimates from four validated formulas to give you a range, not a rigid target.
What Is "Ideal" Body Weight?
The concept of ideal body weight (IBW) originated in the insurance industry in the 1940s when Metropolitan Life Insurance Company published tables linking height and weight to mortality rates. Since then, several formulas have been developed to estimate the weight at which a person of a given height is expected to have the best overall health outcomes. It is important to understand that these formulas were derived from population averages — they do not account for individual factors like muscle mass, bone density, ethnicity, or body composition. A muscular person's "ideal weight" by these formulas may be significantly lower than their actual healthy weight. Think of these numbers as a starting reference point, not a definitive target. Your ideal weight is ultimately the weight at which you feel strong, energetic, and healthy — and at which your metabolic markers (blood pressure, blood glucose, cholesterol) are in a healthy range.
The Four Major Ideal Weight Formulas
Each formula uses a different baseline and per-inch increment. The variation between them illustrates why a range is more useful than a single number. All formulas use height in inches and produce weight in pounds or kilograms.
- Devine (1974): Men = 50 + 2.3 x (height in inches - 60) kg. Women = 45.5 + 2.3 x (height in inches - 60) kg. The most widely used formula in clinical medicine, particularly for drug dosing.
- Robinson (1983): Men = 52 + 1.9 x (height in inches - 60) kg. Women = 49 + 1.7 x (height in inches - 60) kg. Produces slightly higher estimates for shorter men and lower for tall men.
- Miller (1983): Men = 56.2 + 1.41 x (height in inches - 60) kg. Women = 53.1 + 1.36 x (height in inches - 60) kg. Produces the highest estimates, may be most appropriate for larger-framed individuals.
- Hamwi (1964): Men = 48 + 2.7 x (height in inches - 60) kg. Women = 45.5 + 2.2 x (height in inches - 60) kg. One of the oldest formulas, still commonly used by dietitians.
Frame Size Adjustments
All four formulas produce a single estimate for a given height, but real human bodies come in different frame sizes. A person with a large bone structure genuinely weighs more than a small-framed person at the same height, even at the same body fat percentage. A common adjustment is to add or subtract 10% based on frame size: subtract 10% for a small frame, use the base estimate for a medium frame, and add 10% for a large frame. To estimate your frame size, measure your wrist circumference with a tape measure. For men, a wrist under 6.5 inches indicates a small frame, 6.5-7.5 inches is medium, and over 7.5 is large. For women, under 5.5 inches is small, 5.5-6.5 inches is medium, and over 6.5 inches is large. Another method is to wrap your thumb and middle finger around your wrist — if they overlap, you have a small frame; if they just touch, medium; if they do not touch, large.
Why These Formulas Fall Short
Ideal weight formulas share several significant limitations. They were developed primarily from data on Caucasian populations in Western countries and may not generalize well to other ethnic groups. They do not account for body composition — a person carrying 20 pounds of additional muscle is healthier than the formula predicts. They do not consider age, despite the fact that gaining a small amount of weight (5-10 pounds) in middle age may be protective. And they produce a single number rather than a range, implying false precision. The range across the four formulas is typically 10-20 pounds, which itself suggests that the "ideal" weight for any individual is a range, not a point. Use these formulas as context — not as gospel.
A Better Approach: Combining Multiple Metrics
Rather than chasing a single number on the scale, a more comprehensive approach to finding your healthy weight combines several metrics. Start with the ideal weight formulas for a rough range. Then check your BMI to see where you fall in the population-level risk categories. Measure your body fat percentage to understand your actual composition. Check your waist circumference (under 40 inches for men, under 35 inches for women) as a proxy for visceral fat. And most importantly, review your metabolic health markers: blood pressure under 120/80, fasting glucose under 100, triglycerides under 150, and HDL above 40 (men) or 50 (women). A person who is "overweight" by BMI and ideal weight standards but has excellent metabolic markers and high muscle mass is in a fundamentally different health position than someone at their "ideal weight" who is sedentary with poor metabolic markers.
Frequently Asked Questions
No single formula is "most accurate" because ideal weight is not a precise concept. The Devine formula is the most widely used in clinical settings, particularly for medication dosing. The Miller formula tends to produce the highest estimates and may be more appropriate for people with larger frames or significant muscle mass. The best approach is to look at the range across all four formulas and use it as a reference zone rather than fixating on any single number.
These formulas frequently underestimate healthy weight for people who are muscular, have large frames, or are from ethnic groups not well represented in the original data. If the calculated ideal weight seems unrealistically low, it probably is for you. A better approach is to target a healthy body fat percentage (10-20% for men, 18-28% for women) and a BMI in the 20-27 range, adjusted for your individual body composition. Ultimately, the number matters less than how you feel, how you perform, and what your blood work says.
Your ideal weight formula result is a reasonable starting point for a goal weight, but it should be adjusted based on your body composition and history. If you have been heavy your whole life, targeting the midpoint of the formula range is a good first goal. If you are muscular, you may never (and should not try to) reach the formula weight. Set an intermediate goal of losing 10% of your current weight and reassess how you look, feel, and perform at that point before deciding whether to continue losing.
The formulas do not adjust for age, but research suggests that the "ideal" weight may shift slightly upward with age. Studies on older adults find that a BMI of 25-27 is associated with the lowest mortality — slightly higher than the 20-25 range optimal for younger adults. This may be because a modest amount of extra weight provides reserves during illness, protects against falls, and supports bone density. As you age, maintaining muscle mass through resistance training becomes more important than hitting a specific weight target.
Frame size can account for a 10-15% difference in healthy weight at a given height. A large-framed 5'10" man might have a healthy weight 15-20 pounds higher than a small-framed man of the same height, purely due to heavier bone structure and a wider skeleton that supports more muscle. This is why the standard 10% adjustment (up or down from the base estimate) exists. If you are unsure of your frame size, the wrist circumference test provides a quick estimate.
Neither is particularly good as a standalone health indicator. BMI and ideal weight formulas are both crude proxies that use height and weight to estimate health risk without accounting for body composition, fat distribution, or metabolic health. However, if forced to choose, BMI is marginally more useful because it has been extensively studied in large epidemiological datasets and its risk thresholds are well-established. The best approach uses body fat percentage, waist circumference, and metabolic blood markers alongside BMI and ideal weight for a complete picture.
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