How much weight should I gain in the first trimester?

Often little — around 0.5–2 kg total is typical. Most recommended gain happens later in pregnancy.

Are these numbers for twins?

No. Twin pregnancies have higher recommended ranges — ask your maternity team.

What are the early signs of pregnancy?

A missed period, tender breasts, tiredness, nausea and needing to pee more are common early signs; a pregnancy test confirms it.

What BMI is considered healthy?

For most adults a BMI of 18.5–24.9 is in the healthy range; 25–29.9 is overweight and 30 or over is in the obesity range.

How many calories should I cut to lose weight?

A deficit of about 500 kcal a day leads to roughly 0.5 kg (1 lb) of weight loss per week for most people.

How much weight should I gain in the first trimester?

Often little — around 0.5–2 kg total is typical. Most recommended gain happens later in pregnancy.

Are these numbers for twins?

No. Twin pregnancies have higher recommended ranges — ask your maternity team.

What are the early signs of pregnancy?

A missed period, tender breasts, tiredness, nausea and needing to pee more are common early signs; a pregnancy test confirms it.

What BMI is considered healthy?

For most adults a BMI of 18.5–24.9 is in the healthy range; 25–29.9 is overweight and 30 or over is in the obesity range.

How many calories should I cut to lose weight?

A deficit of about 500 kcal a day leads to roughly 0.5 kg (1 lb) of weight loss per week for most people.

Pregnancy Weight Gain Calculator

Women's Health by checkit.health

See how much weight gain is recommended in pregnancy for your pre-pregnancy BMI, based on Institute of Medicine (IOM) guidance. Enter your pre-pregnancy height and weight and your current week.

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Recommended weight gain by pre-pregnancy BMI

Underweight (BMI < 18.5): 12.5–18 kg
Healthy weight (18.5–24.9): 11.5–16 kg
Overweight (25–29.9): 7–11.5 kg
Obesity (30+): 5–9 kg

These are for a single baby (not twins). Most gain happens in the second and third trimesters.

Why weight gain matters in pregnancy

Gaining within the recommended range supports your baby’s growth while lowering risks linked to gaining too much or too little. Your midwife or doctor will personalise advice to your situation.

Frequently asked questions

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Educational use only. checkit.health calculators provide general information and are not a medical diagnosis or a substitute for professional advice. Always talk to a qualified healthcare professional about your health, symptoms or before making changes to medication, diet or exercise.

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