AD to BS Converter

How to Use This Tool

1. Choose the AD dateUse the date picker or type a date from 14 April 1943 to 13 April 2027.
2. Read the BS dateThe result shows the BS year, month and day, the weekday and the fiscal year.
3. Copy the form you needCopy the Devanagari form for a Nepali document or the numeric form for a spreadsheet.

How It Works

The converter counts the days between your date and 14 April 1943, which was 1 Baisakh 2000 BS, then walks forward through the published length of every BS month until that count is used up. What is left is the day of the month. Because the month lengths come from a table, not a formula, a date that sits on a month boundary converts correctly in every year the table covers, and a date outside the table is refused rather than estimated.

Worked Examples

When You Need a BS Date

Anything filed with a Nepali government office expects Bikram Sambat. That includes applications at a district administration office, land and tax paperwork, letters to a ward office, and forms an embassy or consulate passes back to Nepal. People abroad often know their own dates only in AD: a US birth certificate, a passport issue date, a degree completion date. Writing those on a Nepali form means converting each one.

If a form also asks for an age or a duration, compute the age in years and days or count the days between two dates on the AD side first, then convert the dates. For dates that start out in BS, use the BS to AD converter.

Nepali New Year in AD, 2070 to 2083

1 Baisakh, नयाँ वर्ष, falls on 13 April in 41 of the 84 years this converter covers and on 14 April in the other 43. The recent ones:

Fiscal Years in AD: When Each One Starts and Ends

The fiscal year starts on 1 Shrawan and ends on the last day of Asar. Because Asar has 31 or 32 days and Shrawan’s start moves with it, the AD boundary shifts by a day from year to year. A US date in early or mid-July can fall in either fiscal year, so convert it rather than assuming.

Why Festival Dates Move on the AD Calendar

Bikram Sambat months are solar: each one begins when the sun enters the next sign of the zodiac, which is why 1 Baisakh always lands on 13 or 14 April and 1 Magh, Maghe Sankranti, always lands in mid-January. A festival tied to one of those solar dates barely moves on either calendar.

Most of the big festivals are not solar. Dashain, Tihar and Teej are set by tithi, the lunar day, so they follow the moon. A lunar year is about eleven days shorter than a solar one, which is why Dashain can fall in late September one year and late October another, moving on the BS calendar as well as the AD one. Converting a festival date from one year therefore tells you nothing about the next year: look each year up in that year’s published calendar, then convert the date you find. To plan around the gap, count the days between two converted dates.