Healthy Weight Range Calculator
Find your healthy weight range from BMI, adjusted for activity level.
Healthy weight range
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Based on a BMI of 18.5–24.9 for your height.
How this works
A healthy weight range gives you something a single BMI number can't: room. Rather than one exact target, it shows the full span, based on your height, that falls within the widely used "normal" BMI category of 18.5 to 24.9. This calculator works the formula backward from that range instead of forward from your actual weight, solving for the lowest and highest weights that would land you inside it.
BMI itself is just weight divided by height squared, scaled to a standard number, and it's popular because it's simple to calculate and correlates reasonably well with health risk across large populations. But it was never designed to evaluate an individual body, and its best-known blind spot is muscle: since muscle is denser than fat, a very muscular person can weigh well above the "normal" range while carrying little body fat, while a lean but low-muscle person can fall inside the range while carrying more fat than is healthy. BMI also doesn't account for bone density, frame size, or where fat is distributed on the body, all of which affect how a given weight translates to actual health risk.
That's why this calculator nudges the upper bound higher for very active people and athletes, whose training routinely builds enough muscle to push their weight above the standard range without reflecting excess fat. It's a rough, directional adjustment rather than a separate clinical formula, since no widely accepted equation adjusts ideal weight for training volume the way BMI itself is calculated.
Age isn't part of the calculation for a similar reason: there's no validated formula that shifts a "healthy weight" target based on how old you are. That said, general guidance for adults over 65 tends to favor a more flexible reading of BMI ranges, since some research links a slightly higher BMI in older adults to better outcomes during illness or recovery. If that applies to you, treat this range as a looser guide rather than a strict target, and talk to a doctor about what's right for your situation.