Indian Number Format
Indian numbers place a comma after the first three digits, then every two. That is what turns 10000000 into 1,00,00,000 rather than 10,000,000. Enter any number below to see both formats side by side.
Example · 4.5 million — start typing to convert your own
Indian system
International system
The rule, in three steps
The Indian comma pattern is not arbitrary — it tracks the units. Because lakh, crore, arab and kharab each add two digits rather than three, the commas fall every two digits once past the thousands group. Get the commas right and the number almost reads itself.
Step one: starting from the right, count three digits and place a comma. That group is the thousands, and it is the only three-digit group in the number.
Step two: from there, place a comma every two digits. Each new group is a unit — lakh, then crore, then arab, then kharab.
Step three: read the groups left to right using those names. 1,00,00,000 is one crore, zero lakh, zero thousand — One Crore. The international format instead keeps three-digit groups all the way up, giving 10,000,000, read Ten Million.
Common examples
| International | Indian format |
|---|---|
| 100,000 | 1,00,000 |
| 500,000 | 5,00,000 |
| 1,000,000 | 10,00,000 |
| 2,500,000 | 25,00,000 |
| 10,000,000 | 1,00,00,000 |
| 50,000,000 | 5,00,00,000 |
| 100,000,000 | 10,00,00,000 |
| 1,000,000,000 | 1,00,00,00,000 |
Frequently asked questions
Why does India write 1,00,00,000 instead of 10,000,000?
Because the Indian system introduces a new unit every two digits above a thousand — lakh at 10⁵, crore at 10⁷ — so the commas are placed to match those units. The international system introduces one every three digits, so its commas fall differently.
Where does the first comma go in the Indian format?
Three digits from the right, marking the thousands group. Every comma after that is placed two digits apart.
Is the Indian format used outside India?
Yes — it is standard across South Asia, including Pakistan, Bangladesh, Nepal and Sri Lanka. Urdu additionally uses arab and kharab in everyday speech, where Indian English tends to stop at crore and say “lakh crore” for larger figures.
Do the digits themselves ever change between formats?
No. Only the comma positions and the spoken unit names change. 1,00,00,000 and 10,000,000 are the same quantity written two ways.