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Ideal weight calculator

Find your healthy weight range by height and an ideal weight estimate.

ft
in
Healthy weight range
125.3–168.6 lb
Ideal weight (Devine)155.9 lb
Healthy midpoint146.9 lb

The healthy range comes from BMI (18.5–24.9). General references that ignore body composition.

Interactive lesson: What BMI can't see The same BMI can describe an athlete or someone out of shape. See what the index measures — and what it misses.

How the calculation works

There is no single "ideal weight" number — there is a healthy range. It comes from BMI: multiply the 18.5 and 24.9 limits by your height squared.

healthy range = 18.5 × height² to 24.9 × height² (height in meters)

Beyond the range, we show a single reference value from the Devine formula, widely used in clinical settings (e.g., for drug dosing):

Men: 50 kg + 2.3 kg per inch over 5 ft
Women: 45.5 kg + 2.3 kg per inch over 5 ft

Step-by-step example (1.75 m / 5'9")

  • Lower limit: 18.5 × 1.75² = 56.7 kg
  • Upper limit: 24.9 × 1.75² = 76.3 kg
  • Midpoint: ≈ 66.5 kg

Why the range is so wide

Because BMI doesn't tell muscle from fat. A muscular person can weigh more and be perfectly healthy. That's why waist and body-fat percentage complement the picture better than weight alone.

Examples

  • 1.60 m (5'3"): healthy range ≈ 47–64 kg (BMI 18.5–24.9).
  • 1.80 m (5'11"): healthy range ≈ 60–81 kg; Devine (male) ≈ 75 kg.

Frequently asked questions

Is there a single ideal weight?

No. Staying within the healthy range is what matters; the "ideal point" varies with muscle mass, age and bone structure.

Difference between the BMI range and the Devine formula?

The BMI range gives an interval (healthy min and max). Devine gives a single number designed for clinical use. Use the range as the practical reference.

I'm above the range. Is that serious?

It depends on body composition. Athletes and very muscular people often sit above it without risk. Otherwise, it is worth checking waist and habits with a professional.

Does the formula work for children?

No. Children and teens use age-based growth charts (percentiles), not the adult BMI range.

Sources and references

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Updated on June 17, 2026 · by Rafael Rossi · Methodology & sources