Number System Converter

Convert between Indian & International number systems

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How It Works

Two systems, same numbers, different grouping.

The International and Indian number systems represent the same values but use different grouping conventions and names for large numbers.

Multiples of Thousands

The International system groups digits in sets of three from the right. Each new name represents a thousand times the previous: Thousand (10³), Million (10&sup6;), Billion (10&sup9;), Trillion (10¹²).

1,000,000,000 → One Billion

Multiples of Hundreds

The Indian system groups the first three digits from the right, then every two digits after that. Each new name represents a hundred times the previous: Lakh (10&sup5;), Crore (10&sup7;), Arab (10&sup9;), Shankh (10¹&sup7;).

1,00,00,00,000 → One Arab

Same Value, Different Names

The same numeric value has different labels and comma placement in each system. 1 Million = 10 Lakh. 1 Billion = 1 Arab. Understanding both helps avoid costly mistakes in cross-cultural finance and communication.

1 Million = 10,00,000 = 10 Lakh
Reference

Side-by-side comparison of both systems.

A complete mapping of how each scale is named, formatted, and pronounced in the International versus Indian number system.

Value International Name Intl Format Indian Name Indian Format
10³ Thousand 1,000 — 1,000
10&sup5; Hundred Thousand 100,000 Lakh 1,00,000
10&sup6; Million 1,000,000 Ten Lakh 10,00,000
10&sup7; Ten Million 10,000,000 Crore 1,00,00,000
10&sup8; Hundred Million 100,000,000 Ten Crore 10,00,00,000
10&sup9; Billion 1,000,000,000 Arab 1,00,00,00,000
10¹¹ Hundred Billion 100,000,000,000 Kharab 1,00,00,00,00,000
10¹³ Ten Trillion 10,000,000,000,000 Neel 1,00,00,00,00,00,000
10¹&sup5; Quadrillion 1,000,000,000,000,000 Padma 1,00,00,00,00,00,00,000
10¹&sup7; Hundred Quadrillion 100,000,000,000,000,000 Shankh 1,00,00,00,00,00,00,00,000
FAQ

Frequently asked questions about number systems.

Clear answers to the most common questions about converting between International and Indian number systems, reading large numbers, and understanding number naming conventions.

How to convert numbers into international systems?

To convert a number into the International number system, group the digits in sets of three from the right and place commas between each group. Then read each group using the International scale names: Thousand (1,000), Million (1,000,000), Billion (1,000,000,000), and Trillion (1,000,000,000,000).

For example, 78921092 becomes 78,921,092 → Seventy-Eight Million Nine Hundred Twenty-One Thousand Ninety-Two.

Use the converter above for instant, accurate results with full word expansion in both systems.

What is 100000000000000000000 in words?

100,000,000,000,000,000,000 (that's 1 followed by 20 zeros) is read as One Hundred Quintillion in the International number system.

In the Indian number system, this number is formatted as 1,00,00,00,00,00,00,00,00,000 and is called One Shankh (also written as 10 Arab × 10 Lakh Crore). The Indian system uses the first-three-then-pairs comma grouping from the right.

How do I convert my number to an international number?

Converting a number to the International format is simple:

  1. Write the number without any commas.
  2. Starting from the rightmost digit, insert a comma after every three digits.
  3. Read each comma-separated group using International names (Thousand, Million, Billion, Trillion).

Example: 5000000 → 5,000,000 → Five Million.

The converter on this page handles this automatically — just type your number and see both International and Indian formats side by side.

What is 1000000000 in words in Indian?

1,000,000,000 (1 Billion in the International system) is read as One Arab in the Indian number system.

In Indian formatting, this is written as 1,00,00,00,000 → One Arab. Equivalently, 1 Arab = 100 Crore = 1,000 Million = 1 Billion.

What are the 4 types of number system?

The four fundamental types of numeral systems (based on their base/radix) are:

  1. Decimal (Base-10) — Uses digits 0–9. This is the everyday number system we use for counting and arithmetic.
  2. Binary (Base-2) — Uses only 0 and 1. The foundation of all digital computing.
  3. Octal (Base-8) — Uses digits 0–7. Historically used in computing as a shorthand for binary.
  4. Hexadecimal (Base-16) — Uses digits 0–9 and letters A–F. Widely used in programming, color codes, and memory addressing.

Note: Don't confuse these numeral base systems with the Indian vs International naming conventions (Lakh/Crore vs Million/Billion) — both are base-10 systems that simply group and name large numbers differently.

What is 78921092 in words international system?

78,921,092 in the International system is read as:

Seventy-Eight Million Nine Hundred Twenty-One Thousand Ninety-Two

In the Indian system, the same number is 7,89,21,092 → Seven Crore Eighty-Nine Lakh Twenty-One Thousand Ninety-Two.

How do you say this number 13170000000000000000000000?

The number 13,170,000,000,000,000,000,000,000 (13.17 × 1024) is read as:

Thirteen Septillion One Hundred Seventy Sextillion

Breaking it down: 13 septillion + 170 sextillion. A septillion is 1024 (1 followed by 24 zeros). This number is vastly larger than a trillion (1012) or even a quadrillion (1015).

Does 1 zillion exist?

No, "zillion" is not a real number. It's an informal, humorous word used to describe an arbitrarily large, indeterminate number — similar to "bazillion," "gazillion," or "jillion."

The real number scale in the International system follows this progression:

Million (106) → Billion (109) → Trillion (1012) → Quadrillion (1015) → Quintillion (1018) → Sextillion (1021) → Septillion (1024) → …

Each named number is exactly 1,000 times the previous one in the short-scale system used in English-speaking countries.

How to write 20 billion in numbers?

20 Billion in the International number system is written as:

20,000,000,000

That's 20 followed by 9 zeros (10 digits total). In the Indian system, 20 Billion equals 2 Arab and is written as 2,00,00,00,000.

Who is bigger, 1 trillion or 1 billion?

1 Trillion is 1,000 times bigger than 1 Billion.

1 Trillion = 1,000,000,000,000  vs  1 Billion = 1,000,000,000

In the Indian system: 1 Trillion = 1 Lakh Crore (or 10 Shankh-scale), while 1 Billion = 1 Arab. To put it in perspective, if you had 1 billion seconds, that's about 31.7 years. 1 trillion seconds would be about 31,700 years.

What is 20000000 in number names?

20,000,000 in the International system is called:

Twenty Million

In the Indian number system, this is 2,00,00,000 → Two Crore. So 20 Million = 2 Crore.

Is 100 lakh is 1 billion?

No, 100 Lakh is not 1 Billion. Here's the correct conversion:

  • 100 Lakh = 1 Crore = 10 Million
  • 1 Billion = 100 Crore = 1 Arab

So 1 Billion (1,000,000,000) is actually equal to 10,000 Lakh, not 100 Lakh. 100 Lakh only gets you to 1 Crore (10,000,000), which is ten times smaller than 1 Billion.

How many zeros are in 20 trillion?

20 Trillion has 12 zeros after the 2:

20,000,000,000,000

The number is 13 digits long in total. In scientific notation, 20 trillion = 2 × 1013.

What number is this 100000000000000000000000000000000?

This is 1 followed by 32 zeros, which equals 1032:

100 Nonillion (in the short-scale International system)

The naming progression for very large numbers: Million (106) → Billion (109) → Trillion (1012) → Quadrillion (1015) → Quintillion (1018) → Sextillion (1021) → Septillion (1024) → Octillion (1027) → Nonillion (1030) → Decillion (1033). Since this number has 33 digits, it's 100 × 1030 = 100 Nonillion.

What is 40 trillion in numbers?

40 Trillion in the International number system is:

40,000,000,000,000

That's 40 followed by 12 zeros (14 digits total). In the Indian number system, 40 Trillion is formatted as 40,00,000,00,00,000 and equals approximately 4 Shankh (4 × 1011 = 4,00,00,00,00,000 per Shankh).