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Track Your Bump, Every Step of the Way.

PregFitCalc offers simple, accurate pregnancy calculators to help you understand your due date, healthy weight range, and weekly progress all in one place, free to use.

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Pregnancy Calculators

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Pre-Pregnancy BMI & Weight Calculator

Check your pre-pregnancy BMI to understand your healthy weight range before conceiving.

Your Healthy Weight Starts Here

How to Operate this BMI Calculator

  • ⚖️ Enter your pre-pregnancy weight in kilograms (kg) in the first field.
  • 📏 Enter your height — choose cm or Feet & Inches using the toggle buttons, then click “Calculate BMI”.
  • 🎨 Check your result color: Blue = Underweight, Green = Normal, Orange = Overweight, Red = Obese.

Frequently Asked Questions

Your pre-pregnancy BMI acts as a baseline health check for your body. It helps define how much total weight is medically recommended for you to gain over the 9 months of pregnancy to keep both you and your baby safe and healthy.

Absolutely! Millions of women with higher BMIs have perfectly healthy pregnancies and babies. It simply means your doctor might advise you to gain less weight overall during your pregnancy compared to someone with a normal BMI, and focus more on balanced nutrition.

Being underweight means you may need to gain slightly more weight during your pregnancy (usually between 12 to 18 kg) to support your baby’s growth. Focusing on nutrient-dense meals and consulting your gynecologist will help you stay on target.

Generally, doctors do not recommend dieting or trying to lose weight during pregnancy, as your baby needs a steady supply of nutrients. Instead, the focus should be on managing your weight gain slowly and staying active under medical guidance.

These answers are based on in-depth research and medical guidelines, but they are not a substitute for medical advice. Please consult your doctor for guidance specific to your pregnancy.

Misunderstandings About Pregnancy BMI

  • A higher BMI means an unhealthy pregnancy. Not true. Millions of people with overweight or obese BMI categories have completely healthy pregnancies the number simply adjusts your care plan, not your odds.
  • I should try to lose weight if my BMI is high. Doctors do not recommend weight loss during pregnancy, regardless of starting BMI, because your baby needs a steady, uninterrupted supply of nutrients throughout.
  • “BMI is the full picture.” BMI doesn’t account for muscle mass, body frame, or distribution of weight it’s a useful screening tool, not a diagnosis.
  • Being underweight isn’t a concern. It can be being underweight before conception is linked to fertility challenges and may require a higher, more closely monitored weight gain target.
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Hip and Pelvic Pain in Pregnancy

Hip and pelvic pain are common during pregnancy and can have several causes, including strain on the pelvic joints, hormonal changes, and sometimes low vitamin D or calcium.

Why Your Hips and Pelvis Hurt

pelvic pain

Many women feel a deep ache in the hips, the lower back or the pubic bone during pregnancy, and some say it feels as if the hip is slipping out of place. This is usually called pelvic girdle pain, and about one in five pregnant women has it. It happens because pregnancy hormones soften the ligaments that hold the pelvic joints, so the joints move unevenly and the muscles around them must work harder. The pain can get worse when you climb stairs, stand on one leg or turn over in bed. It does not harm your baby, and for most women it eases after delivery. Still, do not ignore it. Tell your doctor early, because a physiotherapist can often bring relief quickly.

Simple Habits

Gentle movement usually helps more than complete rest. Walking and prenatal yoga with a trained instructor can strengthen the muscles around your pelvis, but tell the instructor about your pain and stop any pose that hurts. Avoid crossing your legs, and change your position often during the day. At night, lie on your side with a pillow between your knees, and keep your knees together when you turn. Eat balanced meals and drink enough water, and keep your weight gain steady with our week-by-week weight tracker, because extra strain on your joints can make the pain worse. Good sleep matters too, since tiredness can make pain feel stronger. See your doctor if the pain is severe, or if you notice numbness or weakness in your legs.

Tools for Every Stage

IVF Due Date Calculator: Why It’s Different

How IVF Due Dates Are Calculated

  • IVF dating starts from a known event (egg retrieval or embryo transfer), not an estimated ovulation day, which makes it more precise than a standard LMP calculation.
  • The formula depends on your starting date. From the egg retrieval or fertilization date, add 266 days. From a Day 3 embryo transfer, add 263 days. From a Day 5 blastocyst transfer, add 261 days. This is the same for fresh and frozen transfers.
  • The day count differs because it reflects the embryo’s age on transfer day.
  • Use our IVF due date calculator to get your exact date.

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Staying Active in Pregnancy

Gentle movement and yoga can ease aches, boost energy, and help you feel stronger through pregnancy.

Exercise and Yoga

Exercise Is Safe

If your pregnancy is healthy, regular exercise is good for you and your baby. Doctors usually advise about 150 minutes of moderate activity a week, such as brisk walking. That is 30 minutes on five days, or shorter 10-minute walks spread through the day. If you are new to exercise, start with 5 minutes a day and add a little each week. A simple test is that you should still be able to talk while you move. Walking, swimming and a stationary bike are gentle choices, and regular movement can ease back pain. If any exercise hurts your back or pelvis, stop it. Always ask your doctor before you begin, especially if you have high blood pressure, bleeding or a risk of early labor.

Prenatal Yoga and Safety Rules

Prenatal yoga is a good choice. It builds flexibility, calms the mind and teaches breathing that helps during labor. Join a class made for pregnant women, and tell the teacher how many weeks pregnant you are. Avoid hot yoga, because overheating is not safe for you or your baby. After the first trimester, skip poses where you lie flat on your back, and avoid jerky or high-impact moves. Drink water, wear loose clothes, and rest when you are tired. Stop and call your doctor if you notice bleeding, dizziness, chest pain, a bad headache, calf pain or swelling, regular contractions or leaking fluid. You can also keep an eye on your weight gain with our week-by-week weight tracker.

Pregnancy Week by Week Weight Target

Under TargetAbove Target
Under Target doesn’t automatically mean something is wrong especially in the first trimester, where morning sickness commonly slows weight gain or even causes slight weight loss. Weight gain typically catches up naturally once nausea eases in the second trimester.
Above Target also doesn’t mean you need to diet. It’s simply a signal worth mentioning at your next prenatal visit, so your provider can check in on your nutrition and activity levels not a reason to restrict calories on your own.

About this website

Interactive Pregnancy Health & Fitness Tools

PregFitCalc is a free online resource built to help expecting mothers track their pregnancy with clarity and confidence. Our tools including a Due Date Calculator, Pre-Pregnancy BMI Calculator, and Week-by-Week Weight Tracker are designed using guidelines from trusted medical bodies such as the American College of Obstetricians and Gynecologists (ACOG) and the Institute of Medicine (IOM). Whether you’re just starting to plan your pregnancy or already counting down the weeks, PregFitCalc gives you quick, easy-to-understand results  without replacing the advice of your doctor

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General Info

Sugar & Pressure in Pregnancy: Two Conditions You Shouldn’t Ignore

Gestational Diabetes: What It Means for You and Your Baby

Gestational diabetes happens when the body struggles to produce enough insulin during pregnancy, causing blood sugar levels to rise usually appearing around the 24th to 28th week. It doesn’t mean you did anything wrong; pregnancy hormones naturally make it harder for insulin to work properly, and some women are simply more prone to it than others. The good news is that with regular monitoring, a balanced diet, and light activity, most women manage it successfully and go on to have healthy pregnancies and healthy babies. Left unmanaged, though, it can increase risks like a larger-than-average baby or early delivery which is why routine glucose screening (usually done between weeks 24–28) matters so much.

Why Your Blood Pressure Numbers Matter More During Pregnancy

High blood pressure during pregnancy, often called gestational hypertension, typically develops after the 20th week and usually resolves after delivery. It happens when blood vessels become more resistant to blood flow, forcing the heart to work harder and pregnancy hormones can make some women more susceptible to this than others. In most cases, it’s manageable with regular prenatal check-ups, reduced salt intake, and close monitoring by your doctor. However, if left unchecked, it can sometimes progress to a more serious condition called preeclampsia, which is why routine blood pressure checks at every prenatal visit are so important catching it early makes all the difference for both mother and baby.

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A Note for Those Planning IVF

If you’re planning IVF, many fertility clinics require your BMI to fall within a specific range before starting treatment often somewhere between 18.5 and 35, though this varies significantly by clinic and country. This isn’t about appearance; extreme BMI values on either end can affect hormone response to fertility medications and overall treatment success rates. If IVF is part of your plan, ask your clinic directly for their exact BMI requirements, since guidelines differ from one fertility center to the next.