Check how healthy you are

Find out how healthy you are with our simple calculator tools and see what changes you can make to help you have a healthier pregnancy.

BMI calculator

Your height



Your weight (before pregnancy)



BMI stands for body mass index, and this is a way for your health team to know whether you are a healthy weight for your height.

If you’re overweight, now is not the time to ‘crash’ diet though. The most important thing is to keep pregnancy weight gain at a healthy level.

Find out more about why managing your weight in pregnancy is important.

Caffeine calculator

How much caffeine have you had today?

Mug of tea 350ml

Mug of filter coffee 350ml

Mug of instant coffee 350ml

Can of cola 330ml

Plain chocolate bar 50g

Energy drink 250ml

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Drinking a lot of caffeine in pregnancy has been linked to miscarriage and low birth weight so the current advice is to limit your caffeine intake to no more than 200mg a day during your pregnancy.

Find out more about caffeine in pregnancy.

Smoking calculator

How many cigarettes do you smoke per day?

Some people think that the stress of quitting smoking is worse for the baby than continuing to smoke, but this is not true. Stopping smoking is the best thing you can do to help your baby grow and develop well in the womb.

It's also a very expensive habit. Use our smoking calculator to see what you can buy when you quit.

Find out more about smoking and pregnancy and get help to stop.

More on having a healthy pregnancy

  • A healthy vegetarian salad with bread

    Nutrition in pregnancy

    Now that you’re pregnant, it’s important to eat well. Good nutrition will keep you healthy and help your baby grow and develop.

  • Woman on treadmill at gym.

    Weight management in pregnancy

    Although you will be putting on weight in pregnancy as your baby grows, limiting the amount of extra weight gain in pregnancy will improve your health and your baby's, both now and in the future.

  • Woman smoking cigarette.

    Smoking and pregnancy

    Smoking in pregnancy is harmful to your baby. Quitting is one of the best things you can do to protect your baby’s health through pregnancy and beyond.

  • Pregnant woman exercising on cross-trainer.

    Exercise and activity in pregnancy

    People may tell you that pregnancy is a good time to put your feet up. If your pregnancy is uncomplicated it is actually much healthier for you and your baby to exercise while pregnant.


  1. CMACE/RCOG (2010), Joint Guideline Management of Women with Obesity in Pregnancy: (accessed 23/03/2018)
  2. NICE (2010), Dietary interventions and physical activity interventions for weight management before, during and after pregnancy, Public health guidance 27, 2010
  3. NHS Choices, Caffeine in pregnancy: (accessed 23/03/2018)
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    Last reviewed on April 10th, 2018. Next review date April 10th, 2021.

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