# 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. > Canonical page: https://elysiatools.com/en/tools/nepali-bikram-sambat-and-thai-solar-calendar-bridge - **Category:** Utilities - **Keywords:** bikram sambat, vikram samvat, bs calendar, thai solar, buddhist era, nepali calendar, date converter, be, ad to bs ## Overview 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. ## Inputs - **Gregorian Date (AD)** (date): Pick a date or type YYYY-MM-DD - **BS Year** (number): e.g. 2082 - **BS Month** (number): 1–12 - **BS Day** (number): 1–32 ## When to use - Check dates for cross-border contracts, records, or official paperwork involving Nepal or Thailand. - Convert Nepali Bikram Sambat dates to Gregorian dates for scheduling and historical reference. - Find the Thai Buddhist Era equivalent of a Gregorian date or compare dates used for festivals and travel documents. ## How it works - Enter a Gregorian date in the AD date field, or provide a BS year, month, and day. - The tool calculates the corresponding dates in the Nepali BS and Thai BE calendars. - Thai BE is calculated from the Gregorian year using BE = AD + 543. - The result includes the BS month-length table for the relevant year and an explanation of the conversion algorithm. ## Use cases - Cross-border contracts and administrative records that use different calendar systems. - Nepal and Thailand visa paperwork, travel planning, and date verification. - Researching Hindu festival dates or comparing Nepali, Thai, and Gregorian calendar references. ## Frequently asked questions ### 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. ## Related tools - [Fertilizer N-P-K Blend Calculator](https://elysiatools.com/en/tools/fertilizer-blend-calculator): Compute how to mix base fertilizers to hit a target N-P-K analysis like 10-10-10. 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