Where the ranges come from
The ranges follow widely used guidance that links total gain to pre-pregnancy BMI. They describe typical ranges across many pregnancies, not a goal for any one person.
Free pregnancy tool100% free • No signup required
Pregnancy weight gain calculator
See a general recommended pregnancy weight gain range based on pre-pregnancy BMI.
Related tools
See all tools →Good to know
About these ranges
Gain isn’t steady
Many people gain little in the first trimester, then more steadily afterwards. Weekly weight can go up and down for lots of reasons, including fluid.
Twins
Guidance for twin pregnancies is more limited and ranges are higher. Your care team can give you advice tailored to your pregnancy.
FAQ
Questions parents ask
Is it a problem if I’m outside the range?
Not necessarily. These are general figures. Your healthcare professional can look at your whole picture and tell you whether anything needs attention.
Why is my BMI used?
BMI is a simple way guidelines group starting points. It doesn’t capture everything about health, which is why individual advice matters.
Does this tool save my weight?
No. Everything is calculated in your browser and nothing is stored.