Pregnancy Weight Gain Calculator

Most women gain the most weight during the second and third trimesters, especially in the third trimester due to the baby’s rapid growth and fluid accumulation.

• First trimester: 0.5 – 2 kg
• Second trimester: 4.5 – 6 kg
• Third trimester: 5 – 6 kg

To calculate weight gain during pregnancy:

• Measure your pre-pregnancy weight.
• Track your current weight.
• Subtract pre-pregnancy weight from your current weight.

Formula: Weight gain = Current weight – Pre-pregnancy weight

• Underweight (BMI < 18.5): 12.5 - 18 kg
• Normal weight (BMI 18.5 – 24.9): 11.5 – 16 kg
• Overweight (BMI 25 – 29.9): 7 – 11.5 kg
• Obese (BMI ≥ 30): 5 – 9 kg

Normal weight varies depending on height, body composition, and pre-pregnancy weight. A woman with a normal BMI before pregnancy may weigh between 50 – 70 kg, depending on individual factors.

Baby weight increases significantly during the third trimester, especially from the 7th month onward, when the baby grows rapidly in preparation for birth.

• Eat balanced meals with vegetables, fruits, lean proteins, and whole grains.
• Exercise moderately, such as walking or prenatal yoga.
• Limit processed and high-calorie foods like sugary snacks.
• Consult your doctor for personalized advice.

The second trimester starts at week 13 and continues until week 27.

At 7 months pregnant (around 28 weeks), the baby typically weighs about 1.1 – 1.3 kg.

Doctors estimate baby weight using fundal height (distance from the pubic bone to the top of the uterus) and gestational age. However, ultrasound remains the most accurate method for estimating baby weight during pregnancy.