Nepali Due Date Calculator (BS Date): Due Date, Weeks and Check-ups

Enter the first day of your last period as a Bikram Sambat (BS) date, and your usual cycle length. You get your estimated due date, how many weeks pregnant you are today, and the check-up timing from Nepal's antenatal care guideline, all in BS and English dates. It runs in your browser, so nothing is sent or stored.

First day of your last period

Calendar

Your estimated due date is

 

    Cycella Pregnancy (free on Google Play) keeps your weeks, visits and questions on your phone. See Cycella Pregnancy.

    Calculated in your browser. Nothing you enter is sent or stored. The due date is an estimate; an ultrasound scan date from your health worker is more accurate.

    Written by the Cycella editorial team. See our editorial policy.

    How the Nepali due date calculator works

    A pregnancy is counted as 280 days (40 weeks) from the first day of the last period. Most people in Nepal remember that date in BS, but BS months are not a fixed length: each month has 29, 30, 31 or 32 days, and the same month can be a different length next year. There is no formula for it, only the official calendar table.

    So the calculator converts your BS date to an English (AD) date, adds 280 days (adjusted for your cycle length), and converts the due date back to BS. As a check, 1 Baisakh 2083 BS is 14 April 2026, and with a 28-day cycle a last period on that day gives an estimated due date of 19 January 2027, which is 5 Magh 2083 BS.

    Check-ups in Nepal's antenatal care guideline

    In 2079 BS Nepal's Family Welfare Division moved from 4 to 8 antenatal check-ups. The calculator shows the suggested timing for each one, worked out from your due date:

    1. Up to 12 weeks
    2. Up to 16 weeks
    3. 20 to 24 weeks
    4. 28 weeks
    5. 32 weeks
    6. 34 weeks
    7. 36 weeks
    8. 38 to 40 weeks

    These are the guideline's suggestions. Your health worker may give you different dates, and theirs always come first. Under the Aama programme you may be able to get free delivery care and some cash support. Ask your health post for the current details.

    How accurate is the due date?

    It is an estimate. Only a small share of babies are born on the exact day, and babies born from 37 weeks up to 41 weeks and 6 days are counted as born at term. If your cycles are irregular or you are not sure of the date, an early ultrasound scan usually gives a better date. Read more on the due date calculator page.

    When to see a health worker

    If you think you are pregnant, visit a health post, hospital or doctor early, ideally in the first 12 weeks. Get help straight away if you have any bleeding from your vagina, severe pain in your belly, a bad headache or blurred vision, fits, fever, swelling of your face or hands, fluid leaking from your vagina, or if your baby moves less than usual later in pregnancy. In an emergency in Nepal, call 102 for an ambulance.

    Questions about the Nepali due date calculator

    Can I enter my last period in a Nepali (BS) date?

    Yes. Choose the BS year, month and day of the first day of your last period. The calculator converts it to an English date, works out your due date, and shows every result in both BS and English dates.

    Why not just add 9 months and 7 days in BS?

    BS months have 29 to 32 days and their length changes every year. Adding months in BS can land on the wrong day. Counting 280 days and then converting back to BS is the reliable way.

    Which BS years are supported?

    The calculator uses the official month-length table for 2070 to 2090 BS (April 2013 to April 2034).

    How many antenatal check-ups does Nepal recommend?

    Nepal's antenatal care guideline (Family Welfare Division, 2079) moved from 4 to 8 check-ups: by 12 weeks, by 16 weeks, at 20 to 24, 28, 32, 34 and 36 weeks, and at 38 to 40 weeks. Follow the dates your health worker gives you.

    Is my date stored or sent anywhere?

    No. The calculation and the BS conversion run in your browser. Nothing is sent or stored, and this site has no analytics.

    Keep your weeks, visits and questions in one place. Cycella Pregnancy keeps your weeks, estimated due date, visits, readings and questions on your phone, with an AD/BS switch. It is free on Google Play. See Cycella Pregnancy.

    More tools for Nepal

    Sources

    This tool gives estimates from the dates you enter. It is not medical advice. Your health worker's dates always come first. If something worries you, please visit a health post or doctor.