BMI for 6'4" & 140 lbs
Result: 17.0 · Mild Thinness
Body Mass Index
17.0
Mild Thinness
WHO BMI range for this category: 17 – 18.4
What a BMI of 17.0 at 6'4" and 140 lbs means
A BMI of 17.0 at 6'4" and 140 lbs is in the mild thinness range (17 – 18.4), just under the healthy band. Some endurance athletes and naturally lean adults sit here comfortably, but for the general population it is worth checking energy intake.
For someone 6'4" tall, the WHO healthy BMI range (18.5 – 24.9) corresponds to a body weight between roughly 68.9 – 92.8 kg (151.9 – 204.5 lbs). BMI is a screening tool, not a body composition measurement, so it does not distinguish muscle from fat. Pair it with waist circumference and body fat percentage for a complete picture.
What you would need to weigh at 6'4" to reach each BMI threshold
| Target BMI | Body weight | Difference vs current |
|---|---|---|
| BMI 18.5 (underweight cutoff) | 68.9 kg (151.9 lbs) | +5.4 kg |
| BMI 22 (middle of healthy range) | 81.9 kg (180.7 lbs) | +18.4 kg |
| BMI 25 (overweight cutoff) | 93.1 kg (205.3 lbs) | +29.6 kg |
| BMI 30 (obesity cutoff) | 111.7 kg (246.4 lbs) | +48.2 kg |
BMI for nearby heights and weights
Reference values at similar measurements. Each link is a pre-calculated page.
Looking for the metric equivalent? See BMI for 195 cm & 65 kg →
Frequently asked questions
- Is a BMI of 17.0 healthy for 6'4"?
- A BMI of 17.0 at 6'4" is classified as Mildly Underweight. The WHO healthy BMI range is 18.5 – 24.9, which for your height translates to roughly 68.9 – 92.8 kg (151.9 – 204.5 lbs).
- What is the ideal weight for someone 6'4" tall?
- The mid-point of the healthy BMI range (BMI 22) for 6'4" is approximately 81.9 kg (180.7 lbs). The full healthy range spans roughly 68.9 – 92.8 kg. Body composition matters more than the exact number — a muscular person can sit at the top of the range and be perfectly healthy.
- How does BMI relate to body fat percentage at 140 lbs?
- BMI does not measure body fat directly. Two people at 6'4" and 140 lbs can have very different body compositions. A trained athlete at this weight may have 12 – 15% body fat, while a sedentary adult may have 25 – 30%. Use the Body Fat Calculator for a more precise estimate.
- Is BMI accurate for everyone at 6'4" tall?
- BMI is a population-level screening tool. It systematically over-classifies muscular athletes as overweight and under-classifies older adults with sarcopenic obesity. For an individual assessment at 6'4", combine BMI with waist circumference (men < 94 cm, women < 80 cm at low risk) and body fat percentage.
- How much weight would I need to lose or gain to reach a healthy BMI at 6'4"?
- If your BMI is below 18.5, gaining weight up to the 68.9 kg (151.9 lbs) threshold puts you in the healthy band. If above 25, losing weight toward 92.8 kg (204.5 lbs) does the same. Aim for 0.25 – 0.5 kg per week for sustainable change.
Calculate with your own values
This page shows pre-calculated results for 6'4" and 140 lbs. For any other combination, use the full calculators below.