Century / Decade / Year Converter
Type any BCE or CE year and get its century, decade, millennium, regnal year, AD/BC equivalent — plus conversions to Hijri (AH), Vikram Samvat, Saka Era, Buddhist Era, Bengali Bangabda, Hebrew anno mundi and Roman Ab Urbe Condita (AUC). A famous-year lookup tells you what happened in that year.
What this tool does
Type a year, choose CE or BCE and the converter computes — instantly — the century (with the proper ordinal: 7th, 14th, 21st), the decade ("1940s CE"), the millennium ("3rd millennium CE"), the AD/BC equivalent and a continuous index across the era boundary. Optional accession + event-year inputs return the regnal year (12th of the king\'s reign). Below that, the tool shows seven non-Gregorian calendar conversions side by side, and a famous-year lookup tells you what milestone (if any) belongs to that year.
Calendar systems supported
- Common Era / BCE-CE — modern academic standard.
- Anno Domini / AD-BC — older Christian framing.
- Hijri (AH) — Islamic lunar calendar; Year 1 = 622 CE (Muhammad\'s migration to Medina).
- Vikram Samvat — Indian calendar; CE + 57.
- Saka Era — Indian National Calendar; CE − 78.
- Buddhist Era — Theravada Buddhism; CE + 543.
- Bengali Bangabda — Bangladesh and West Bengal calendar; CE − 593.
- Hebrew Era (anno mundi) — Jewish calendar; CE + 3760 (approx.).
- Roman Ab Urbe Condita (AUC) — "from the founding of the city"; CE + 753.
The conversions use linear formulas suitable for exam-style orientation. Lunar–solar drift in the Hijri / Hebrew / Buddhist calendars accumulates over centuries, so legal or religious use should rely on an astronomical converter.
The famous-year lookup
Type one of these years to see the famous-year card appear: 563 BCE (Buddha), 490 BCE (Marathon), 261 BCE (Kalinga War), 44 BCE (Caesar assassinated), 78 CE (Saka Era begins), 622 CE (Hijra), 732 (Tours), 1066 (Hastings), 1206 (Delhi Sultanate founded), 1453 (Fall of Constantinople), 1492 (Columbus), 1517 (Luther\'s Theses), 1526 (First Panipat), 1707 (Death of Aurangzeb), 1757 (Plassey), 1789 (French Revolution), 1857 (Indian Revolt), 1885 (INC founded), 1947 (Indian Independence), 1969 (Apollo 11) and many more.
The lookup carries about 70 milestone years in total — every major battle, dynasty, document or movement that an exam syllabus or general-history reader is likely to test.
BCE / CE and the no-year-zero rule
Modern academic chronology counts years backwards as BCE (Before Common Era) and forwards as CE (Common Era), with no year zero between them: 1 BCE → 1 CE. A figure born in 4 BCE who died in 33 CE lived 36 years, not 37 — there is no year zero to subtract. The tool computes spans correctly using a continuous internal index. If you type 0, the converter rejects it and explains why.
How to use the tool
- Type a Year.
- Pick CE or BCE.
- Optionally enter a Ruler accession year and an Event year to compute regnal year.
- Read the result card (century, decade, millennium, AD/BC) and the calendar conversions below it.
- If the year matches a famous milestone, the lookup card displays the event description.
- Use Copy CSV / Download JSON / Print from the action bar.
Worked examples
1947 CE → 20th century CE, 1940s CE, 2nd millennium CE, 1947 AD. Hijri ≈ AH 1366. Vikram = 2004. Saka = 1869. Buddhist Era = 2490. Roman AUC = 2700. The famous-year card highlights "Indian Independence and Partition".
1492 CE → 15th century CE, 1490s CE, 2nd millennium CE. Vikram = 1549. Saka = 1414. The famous-year card lists "Columbus reaches the Americas; fall of Granada; expulsion of Jews from Spain".
261 BCE → 3rd century BCE, 260s BCE, 1st millennium BCE. The famous-year card shows "Kalinga War — Ashoka converts to Buddhism".
FAQs
What century is 1947 CE?
1947 CE is in the 20th century. The simple rule is this: years 1901 to 2000 belong to the 20th century. Students often think 1947 must be the 19th century because it begins with 19, but that is not how centuries are counted. A quick formula is: century = ((year - 1) // 100) + 1. So for 1947, it becomes ((1947 - 1) // 100) + 1 = 20. For Indian history, this is the century of Independence. Writing one extra example beside the rule makes the calculation much safer.
How do you convert a BCE year into a century?
To convert a BCE year into a century, ignore the BCE label for a moment, take the year number, divide by 100, and round up. Then put BCE back after the century. For example, 326 BCE falls in the 4th century BCE because 301 BCE to 400 BCE is the 4th century BCE. Remember, BCE centuries also move backward when we read history. So the 5th century BCE comes before the 4th century BCE. This small point saves many mistakes in ancient-history dates.
Is there a year zero between BCE and CE?
In the usual historical calendar, there is no year zero between BCE and CE. The sequence goes 2 BCE, 1 BCE, then 1 CE, 2 CE. This matters whenever we calculate time spans. For example, from 1 BCE to 1 CE is one year, not two years. If a calculator silently inserts a zero year, the result becomes wrong. For classroom history, always remember that BCE and CE meet directly at 1 BCE and 1 CE. Once this rule is clear, most chronology questions become much easier.
How do I convert Vikram Samvat to CE for history study?
For most history-study shortcuts, Vikram Samvat is converted to CE by subtracting 57. So Vikram Samvat 2080 is roughly 2023 CE. This works well for many exam-level questions, but there is a calendar-month detail. The Vikram Samvat year does not begin on exactly the same date as the Gregorian calendar year in every regional tradition. So for precise inscriptions, coins, or dates near the new year, check the month also. For quick revision, though, VS - 57 is the usual working rule.
What decade was 1526 CE?
1526 CE falls in the 1520s decade. A decade is normally written by keeping the first three digits and grouping years from 1520 to 1529 together. In Indian history, 1526 is especially important because it is the year of the First Battle of Panipat, where Babur defeated Ibrahim Lodi. That battle opened the way for Mughal rule in North India. So when you revise 1526, remember both the decade and the historical context. Writing one extra example beside the rule makes the calculation much safer.
How do regnal years work in history dates?
Regnal years count time according to a ruler's reign, not the ordinary calendar alone. The simple formula is: regnal year = event year - accession year + 1. If a ruler came to the throne in 1556, then 1556 is the first regnal year, 1557 is the second, and so on. This method appears in inscriptions, coins, and royal records. It is useful, but you must know the accession year clearly. Otherwise the calculation may shift by one year. Once this rule is clear, most chronology questions become much easier. Historical Age Calculator