Healthy Weight Range by Height: The BMI 18.5 to 24.9 Table in kg and lb
October 21, 2026
The normal BMI range of 18.5 to 24.9 translates directly into a weight range for any height: lowest weight = 18.5 × height², highest weight = 24.9 × height², with height in meters. For a person who is 1.75 m tall (about 5 feet 9 inches), that is 56.7 kg to 76.3 kg, or 125 to 168 pounds. Seeing the range, instead of a single ideal number, reflects the reality that a spread of about 20 kg or 40 pounds is consistent with the normal category.
Within that range, where you fall depends on frame size, muscle mass, age, genetics, and health. The range is a screening guide and not a target.
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The following table uses the WHO adult BMI range. It is for adults only.
| Height | Weight at BMI 18.5 | Weight at BMI 24.9 |
|---|---|---|
| 1.50 m (4 ft 11 in) | 41.6 kg (92 lb) | 56.0 kg (123 lb) |
| 1.60 m (5 ft 3 in) | 47.4 kg (104 lb) | 63.7 kg (141 lb) |
| 1.70 m (5 ft 7 in) | 53.5 kg (118 lb) | 72.0 kg (159 lb) |
| 1.75 m (5 ft 9 in) | 56.7 kg (125 lb) | 76.3 kg (168 lb) |
| 1.80 m (5 ft 11 in) | 59.9 kg (132 lb) | 80.7 kg (178 lb) |
| 1.90 m (6 ft 3 in) | 66.8 kg (147 lb) | 89.9 kg (198 lb) |
How to Compute Your Own Range
Convert your height to meters (inches × 0.0254), square it, and multiply by 18.5 and 24.9. For 5 ft 6 in (66 in = 1.676 m): 1.676² = 2.810. The range is 52.0 kg to 70.0 kg, or 115 to 154 lb. To get pounds directly: weight (lb) = BMI × inches² ÷ 703.
The table shows how quickly the range rises with height, because weight scales with the square of height under BMI. A 10 cm increase in height at around 1.70 m adds about 6 to 9 kg to the range.
Picking a Point Within the Range
Being in the normal range does not guarantee good health, and being slightly above or below it does not guarantee poor health. Factors that help judge include waist circumference, fitness, blood pressure, blood sugar, cholesterol, and how you feel and perform. A muscular person may sit at the upper end or above it with low body fat, while someone with a small frame and low muscle might be healthier toward the middle.
For older adults, some research suggests that a BMI toward the upper part of the normal range or slightly above may be associated with lower mortality, possibly because reserves of weight and muscle help recovery from illness. Discuss goals with your clinician.
Use With Care
If you are below the range, ask whether it is your natural weight or the result of illness, restricted eating, or stress. If you are above it, a gradual loss of 5% to 10% of body weight can deliver measurable health improvements, such as lower blood pressure and better blood sugar, even if BMI stays above 25. Set goals in terms of habits and health markers as well as the scale.
Different Standards for Different Groups
For people of South and East Asian descent, health organizations suggest lower BMI cutoffs for risk, as discussed elsewhere. Children and teens use percentiles. Pregnancy changes everything, with separate weight-gain guidelines by pre-pregnancy BMI.
Frequently Asked Questions
What is the healthy weight range for 5 ft 9 in?
About 56.7 to 76.3 kg (125 to 168 lb) for a BMI of 18.5 to 24.9.
How do I calculate my healthy weight range?
Multiply 18.5 and 24.9 by your height in meters squared.
Is the lower end of the range healthier?
Not necessarily. Health depends on body composition, fitness, and other markers, not just proximity to a boundary.
Does the range differ for men and women?
The BMI categories are the same, but body composition differs, so the healthiest weight within the range may differ.
Can I be healthy outside the range?
Possibly, particularly if muscular, but check other indicators with a clinician.