The ideal body weight for 140 cm height is between:
36.26 kg – 48.98 kg (metric)
79.94 lb – 107.98 lb (imperial)

Reference: BMI classification


Your body weight is in the normal range if your BMI is between 18.50 and 24.99. Using these values and your height in the BMI formula, we can find the lower and upper range of body weight that is considered healthy.

BMI = Weight/ (Height * Height), where weight is in kg and height in meters.

Since BMI value is independent of sex, the following weight range is applicable for both adult males and females who are 140 cm tall.

Lower bound: 18.5×1.4×1.4 = 36.26 kg
Upper bound: 24.99×1.4×1.4 = 48.98 kg

141 cm

Calculate Your Body Mass Index

Knowing Your BMI  Is A Simple Way To Check If You're In A Healthy Weight Range