Which calendars does this tool convert?

It converts between Gregorian AD, Nepali Bikram Sambat BS, and Thai Buddhist Era BE calendars.

Can I convert a BS date to Gregorian?

Yes. Enter the BS year, month, and day to get the corresponding Gregorian and Thai BE dates.

How is the Thai Buddhist Era date calculated?

The Thai BE year equals the Gregorian AD year plus 543.

Why do BS month lengths vary?

Nepali BS month lengths are set by the Nepal panchang and can vary from year to year.

What BS years are covered by the month-length table?

The embedded corrected table covers BS years 2000 through 2099, corresponding approximately to AD 1943 through 2043.

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Nepali Bikram Sambat & Thai Solar Calendar Bridge

Convert any date between Gregorian (AD), the Nepali Bikram Sambat (BS) calendar, and the Thai solar (Buddhist Era, BE) calendar. Shows the BS month-length table for the year and explains the algorithm.

Details

What this tool helps you do

Bridge three calendars at once. Enter a Gregorian date and the tool computes the equivalent Nepali Bikram Sambat date (Nepal's official calendar, ~56.5 years ahead of AD with a mid-April new year) and the Thai Buddhist Era date (BE = AD + 543). BS month lengths vary year to year per the Nepal panchang — this tool embeds the community-corrected days-per-month table (BS 2000–2099, AD 1943–2043) verified against Hamropatro, not a flawed linear approximation. You can also convert from a BS date back to Gregorian. Ideal for cross-border contracts, Nepal/Thailand visa paperwork, and Hindu festival date work.

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Nepali Bikram Sambat & Thai Solar Calendar Bridge

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Key facts

Overview

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How it works

Use cases

Examples

1. Convert a Gregorian date to BS and BE

2. Convert a BS date back to Gregorian

FAQ

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