Pregnancy Weight Gain Chart

Last Updated on March 2, 2026 | 1 : 44 pm by Anas Brittany

Use this pregnancy weight gain chart to estimate a recommended weight gain range by week based on your pre-pregnancy BMI. Enter your height and pre-pregnancy weight (or BMI), choose whether you’re pregnant with one baby or twins, and view a week-by-week chart plus total recommended gain ranges.

What Is a Pregnancy Weight Gain Chart?

A pregnancy weight gain chart shows a recommended weight gain range over time, based on a person’s pre-pregnancy BMI and whether the pregnancy is a singleton or twins. The chart helps you visualize weight gain by week, rather than looking only at a single total number.

Because weight gain is not perfectly linear, the chart is best used as a guideline for tracking trends and staying within a healthy range.

Recommended Pregnancy Weight Gain by BMI

Pregnancy weight gain recommendations are typically grouped by pre-pregnancy BMI category:

• Underweight: recommended higher total gain
• Normal weight: moderate total gain
• Overweight: lower total gain
• Obese: lowest total gain

This calculator uses those categories to generate a total recommended gain range and a week-by-week chart.

How the Week-by-Week Chart Works

This chart uses a practical approach:

• Weight gain is often smaller in the first trimester
• Weight gain typically increases more steadily in the second and third trimesters
• The total recommended range depends on BMI category and whether you’re carrying one baby or twins

The shaded band on the chart represents a recommended range, not a precise target line. Many healthy pregnancies include weeks with little gain and other weeks with more gain.

Pregnancy Weight Gain: What Counts Toward the Scale

Pregnancy weight gain isn’t only body fat. It can include:

• Baby
• Placenta
• Amniotic fluid
• Increased blood volume and fluids
• Breast and uterine tissue growth
• Maternal energy stores

That’s why weight can rise even when eating patterns feel similar.

Important Notes About Weight Gain

A healthy weight gain goal can vary due to:

• Medical conditions (such as gestational diabetes or hypertension)
• Multiple pregnancy factors (twins often have different guidance)
• Fluid retention and swelling
• Severe nausea or appetite changes
• Provider-specific recommendations based on growth measurements

If you are outside the suggested range, it does not automatically mean something is wrong—but it can be a useful signal to discuss with a healthcare provider.

Frequently Asked Questions

Is it normal to gain very little weight early on?

Yes. Many people gain little in the first trimester, especially if nausea reduces appetite. Weight gain often becomes more steady later.

What if my weight gain is above the recommended range?

Higher-than-recommended gain can happen from fluid retention or higher calorie intake. It may increase certain risks, so it’s worth discussing with your provider, especially if the trend continues.

What if I’m below the recommended range?

Lower gain can happen with low appetite, nausea, or high activity. Your provider may focus on fetal growth, nutrition, and overall health rather than the scale alone.

Can I use this as a medical diagnosis?

No. This is a planning and tracking tool. Pregnancy care decisions should be made with a licensed healthcare provider who can evaluate your full health picture.