Pregnancy Weight Gain Calculator

See how your weight gain compares to recommended ranges based on your pre-pregnancy BMI and current week.

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Weeks since the first day of last period.

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How is the range set?

Recommendations follow Institute of Medicine guidelines, which use your pre-pregnancy BMI to estimate a healthy total weight gain across the full pregnancy.

What if I'm off range?

Small variations are common — many women lose weight in the first trimester. Talk to your obstetrician before changing your diet or activity, especially if you're carrying twins.

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Pregnancy weight guide

Healthy weight gain through every trimester

Pregnancy is one of the most meaningful new beginnings in a woman's life — full of excitement and cherished moments. As you embrace this life-changing phase, prioritising your health and weight makes a real difference. Here's an expert-guided look at how the Pregzify weight-gain tracker can support your journey.

Possible complications of suboptimal weight gain

Gaining weight during pregnancy is a positive sign, but the balance matters. Both excessive and inadequate weight gain can lead to complications such as:

  • Low birth weight
  • Preterm birth
  • Gestational diabetes
  • Pre-eclampsia
  • Fetal macrosomia
  • Delivery complications

Every pregnancy is unique, and the right balance matters throughout the journey. Pregzify provides expert guidance and a Pregnancy Weight-Gain Calculator to help you track a healthy range tailored to your body. Mindful choices lead to a smoother, healthier journey to motherhood.

How much weight should you gain during pregnancy?

Step one: nourish your body with the essential nutrients. If you feel uncertain about how to navigate this journey, Pregzify has your back. You are not alone — the foundation is a balanced diet and a healthy lifestyle, before any weight goal.

Range varies depending on whether the pregnancy is single, twin, or multiples, and your starting weight.

First trimester

1–5 lbs

Light gain — sometimes none.

Second trimester

0.5–1 lb

Per week, healthy starting weight.

Third trimester

0.5–1 lb

Per week, healthy starting weight.

Under 18? Speak with your doctor or midwife to set a target range that fits your body.

What should you eat during pregnancy?

Pregnancy brings a flood of advice — especially about food. Eat for two? Avoid caffeine? Load up on dairy? It's easy to feel overwhelmed. Honestly, it's less about eating more and more about eating smarter. With a weight tracker keeping you on course, the noise drops away.

Do you need to “eat for two”?

Not exactly. Your body needs about 300 extra calories a day — a banana with peanut butter, a handful of nuts and yogurt, a wholesome snack. Overeating won't help, but nourishing your body will.

What belongs on your plate

  • Fruits & vegetables: apples, berries, oranges, mango, leafy spinach. The simplest path to baby's vitamins.
  • Whole grains: oatmeal, brown rice, whole-wheat toast — keep you full and energy steady.
  • Proteins: eggs, chicken, fish, beans, lentils, tofu. Building blocks for baby's muscles.
  • Dairy & calcium: milk, cheese, yogurt — or almonds, sesame seeds, leafy greens if dairy isn't for you.
  • Iron & iodine: spinach, beans, fully-cooked seafood, eggs — for oxygen flow and brain development.

Stay hydrated, skip the wrong things

Aim for 8–10 glasses of water daily. Cut back on caffeine (a small cup is fine), skip alcohol, and avoid raw seafood. Sushi works only if it's fully cooked. Log your weight on the Pregzify tracker each day to stay on course.

Some days will be perfect, some won't — that's OK

You'll have days when everything goes right and days when only fries and ice cream will do. Normal. Aim for balance, not perfection. Baby thrives when you feel good, too — and the weight-gain tracker keeps the trend in view.

Research published in BMC Pregnancy and Childbirth finds that several factors shape quality of life during pregnancy — beginning with a balanced diet that supports healthy development for both mother and baby.

A weight-gain tracker can guide you, but other factors influence well-being too: maternal age, education, income, family support, and consistent physical activity (yoga, walking, light exercise). Together, these shape pregnancy outcomes and the well-being of mother and baby.

Address them early. The Pregzify Pregnancy Weight-Gain Calculator helps you monitor your weight regularly and maintain a healthy lifestyle throughout your pregnancy under expert guidance. Relax and rejuvenate with confidence — Pregzify has you covered.

Frequently asked questions

Everything you need to know about this calculator.

It estimates whether your current weight gain falls within the recommended range based on your pre-pregnancy BMI and how far along you are. It follows Institute of Medicine (IOM) guidelines used by obstetricians worldwide.

It depends on your pre-pregnancy BMI. Underweight women (BMI < 18.5) are recommended to gain 12.5–18 kg, normal weight (18.5–24.9) 11.5–16 kg, overweight (25–29.9) 7–11.5 kg, and obese (30+) 5–9 kg over the full 40 weeks.

Yes. Many women lose weight or gain very little in the first trimester due to nausea and morning sickness. Weight gain typically accelerates in the second and third trimesters. Speak to your doctor if weight loss is significant or persistent.

Small variations are common and usually not a concern. However, consistently gaining too much or too little may increase risks for both mother and baby. Talk to your obstetrician before making dietary changes.

No. The IOM recommendations used here are for singleton pregnancies. Twin and multiple pregnancies have different weight gain targets. Consult your doctor for personalized guidance in those cases.

Weight gained during pregnancy is distributed across the baby (3–3.5 kg), placenta (0.5–1 kg), amniotic fluid (1 kg), increased blood volume (1.5–2 kg), uterine growth (1 kg), breast tissue (0.5–1 kg), fat stores for breastfeeding, and extra fluid.

Most doctors recommend weighing yourself once a week, at the same time of day, for consistent tracking. Avoid daily weigh-ins as normal fluid fluctuations can cause unnecessary worry.

No. This tool provides general estimates based on standard guidelines. Your doctor may adjust recommendations based on your individual health, medical history, and pregnancy complications. Always follow your healthcare provider's advice.

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