Unit Tools

Free Online Number System Converter, Binary, Decimal, Hex & Octal

Convert between binary, decimal, hexadecimal and octal, and see the working rather than just the answer. Useful for colour codes, file permissions, memory addresses and homework. Invalid digits for the chosen base are caught as you type instead of giving a quietly wrong result.

Answers As You Type Exact Factors Runs In Your Browser

Free Online Number System Converter, Binary, Decimal, Hex & Octal

One crore is ten million. One arab is one billion. South Asia groups digits in twos after the first thousand, the West groups them in threes, and that single difference is where the zeros get lost. A lakh is 100,000. A crore is 100 lakh. An arab is 100 crore, which lands exactly on a billion.

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🔢 Number System Converter Base unit: Unit · 9 units

Every factor ships with the page. The sum runs in your browser and nothing is sent anywhere.

🔢 Convert large number

Pick the two scales, type a number, and the answer is already there.

From

Amount

Result

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Recent conversions, kept in this browser only.

Nothing here yet Use Log to history on the converter tab to keep a conversion here. Reuse one to load its numbers back.

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Common Number Conversions

Both directions, because people come from both systems.

Conversion	This	Equals
lakh to million	1 lakh	0.1 million
million in lakh	10 lakh	1 million
crore to million	1 crore	10 million
million to crore	1 million	0.1 crore
10 crore in million	10 crore	100 million
crore to billion	100 crore	1 billion
arab to billion	1 arab	1 billion
billion to crore	1 billion	100 crore
kharab to billion	1 kharab	100 billion
trillion in kharab	1 trillion	10 kharab
crore to lakh	1 crore	100 lakh
lakh to thousand	1 lakh	100 thousand

How Many Zeros? Both Systems Side by Side

Written out in full, so you never count them on screen.

Zeros	The number	International	South Asian
3	1,000	Thousand	Hazaar
5	100,000	Hundred thousand	Lakh
6	1,000,000	Million	10 lakh
7	10,000,000	10 million	Crore
9	1,000,000,000	Billion	Arab (100 crore)
11	100,000,000,000	100 billion	Kharab
12	1,000,000,000,000	Trillion	10 kharab

The commas are the real trouble. The West puts one every three digits, so a crore reads 10,000,000. South Asia groups the first three and then twos, so the same number reads 1,00,00,000. Same value, and a completely different shape on the page.

How to Convert Numbers

Four steps, and not one of them needs a server.

Pick your two scales

Lakh, crore, arab and kharab on one side, thousand, million, billion and trillion on the other. Or mix them freely.

Type the value

The converted value appears in the second box as you type. No convert button, and nothing leaves the device.

Check the zeros

The chart on this page writes each scale out in full, so you can confirm the answer without counting zeros on a screen.

Keep your usual bases

Save decimal to hex, decimal to binary or whichever pair you run daily, and pick recent values back up from history.

Every Scale, and What It Equals

Every unit in this converter, relative to one unit.

Unit	1 unit equals
Unit (ones)	1 unit (the base unit)
Thousand (K)	1,000 unit
Lakh (lakh)	100,000 unit
Million (M)	1,000,000 unit
Crore (crore)	10,000,000 unit
Billion (B)	1,000,000,000 unit
Arab (arab) *	1,000,000,000 unit
Kharab (kharab)	100,000,000,000 unit
Trillion (T)	1.0e+12 unit

* Units marked with a star are approximate by nature. Hover the star to see why.

What This Converter Does

And what it will not quietly get wrong.

Hex appears as you type

Type a decimal value and the binary, octal and hexadecimal forms are already there beside it.

Both systems together

Lakh and crore beside million and billion, so a number written in one style can be read in the other.

Zeros written out

A chart with the full figure for every scale, because counting zeros off a screen is how mistakes get made.

Arab and kharab included

The scales above crore that most converters stop short of, with the exact figure for each.

Your usual base pairs

Keep decimal to hex, or decimal to binary, one tap away, and pick any recent value back up where you left it.

No connection needed

The digit work happens in the page, so there is no account to make, nothing to upload and no server to call.

Frequently Asked Questions

What people actually ask about lakh and crore.

10 million, exactly. A crore is 10,000,000, which is a 1 followed by seven zeros. Going the other way, 1 million is 0.1 crore, and 10 million makes a full crore.

10. A lakh is 100,000 and a million is 1,000,000, so ten lakh make a million. This is the conversion people get wrong most often, because both numbers feel about the same size when you say them out loud.

Seven. A crore is 10,000,000. A lakh has five, an arab has nine and a kharab has eleven. There is a full chart on this page so you never have to count them off a screen, which is where the mistakes happen.

Because the two systems group digits differently. The West puts a comma every three digits: thousand, million, billion. South Asia groups the first three, then twos after that: 1,00,000 for a lakh and 1,00,00,000 for a crore. Neither is wrong, but the commas land in different places, so reading a number written in the other style is genuinely hard.

Yes, exactly. One arab is 100 crore, which is 1,000,000,000. It is a rare case where the two systems land on the same number, so no rounding is involved at all.

Arab, then kharab, then nil and padma in some usages. An arab is 100 crore, or one billion. A kharab is 100 arab, which is 100 billion. Beyond that the names vary by region and language, and most people switch to the international scale instead.

A crore is a count, not a currency, so 1 crore rupees is 10 million rupees and 1 crore dollars is 10 million dollars. The word does not change the money, only how the number is spoken. Turning rupees into dollars needs an exchange rate, which this converter deliberately does not use.

Six, nine and twelve. Each step up adds three more zeros in the international system. In the South Asian system the steps are different sizes, which is exactly why the chart on this page lists both side by side.

No. Binary, octal, decimal and hexadecimal conversion is plain digit work done inside the page, so the values you type never leave the device. What you looked up and the pairs you saved stay in this browser on this device, and Settings clears them for good.