Quick answer
Number scale conversion changes between naming systems by multiplying place values. 1 crore equals 10 million (10,000,000), and 1 lakh equals 100,000.
Enter a value and choose the scale units. The calculator returns the converted number.
Related tools: Scale Conversion Calculator: Convert between model and actual lengths at a 1:N scale. Number Sequence Calculator: Identify an arithmetic or geometric sequence and find the next terms. Prime Number Calculator: Check whether a number is prime and find the next prime.
How to use the Number Scale Converter
- Enter value.
- Choose from: Ones, Thousand, Lakh, Million, Crore and Billion and 2 more.
- Choose to: Ones, Thousand, Lakh, Million, Crore and Billion and 2 more.
- Enter decimal places (between 0 and 10). It starts at 4.
- Press Calculate to see the result, and use Reset to start again.
| Input | What to enter | Allowed values |
|---|---|---|
| Value | A number | — |
| From | Choose one: Ones; Thousand; Lakh; Million; Crore; Billion; Arab (100 crore); Trillion | Starts at Ones |
| To | Choose one: Ones; Thousand; Lakh; Million; Crore; Billion; Arab (100 crore); Trillion | Starts at Thousand |
| Decimal places | A number | ≥ 0, ≤ 10, starts at 4 |
Formula and method
Formula
result = value × (factor of source ÷ factor of target), base unit: one
IEEE-754 double precision; displayed to the chosen number of decimal places (default 4). Very small or large results are shown in scientific notation.
Every unit is defined by an exact or published factor to the base unit (one). The value is multiplied by the source factor and divided by the target factor.
Worked examples
These examples are verified: each one is an automated test case that the live calculator must reproduce exactly.
Example 1
Inputs: Value = 1; From = Crore; To = Million; Decimal places = 4.
| Result | Value |
|---|---|
| Crore → Million | 10 |
| Input | 1 Crore |
Example 2
Inputs: Value = 1; From = Lakh; To = Thousand; Decimal places = 4.
| Result | Value |
|---|---|
| Lakh → Thousand | 100 |
| Input | 1 Lakh |
Example 3
Inputs: Value = 2.5; From = Billion; To = Million; Decimal places = 4.
| Result | Value |
|---|---|
| Billion → Million | 2,500 |
| Input | 2.5 Billion |
The first line is the headline result (crore → Million). Below it the number Scale Converter lists input, which describe the same case from other angles. IEEE-754 double precision; displayed to the chosen number of decimal places (default 4). Very small or large results are shown in scientific notation.
Unit reference
Each unit expressed in the base unit used for the calculation. Conversions go through this base unit, so any unit can be converted to any other in the table.
| Unit | Equals (in one) |
|---|---|
| Ones | 1 |
| Thousand | 1000 |
| Lakh | 100000 |
| Million | 1000000 |
| Crore | 10000000 |
| Billion | 1000000000 |
| Arab (100 crore) | 1000000000 |
| Trillion | 1000000000000 |
South Asian and Western systems
The Indian system groups digits as thousand, lakh (10⁵), crore (10⁷) and arab (10⁹), while the Western system uses thousand, million (10⁶) and billion (10⁹). So 1 billion is 100 crore, and 10 lakh is 1 million.
Short and long scale
In the short scale used in the US, a billion is 10⁹; in the old long scale, still used in some countries, it is 10¹². Check the scale before comparing figures from different sources.
How the result changes with value
Holding every other input at the first worked example, this table changes only value. It shows how sensitive the answer is to that one value; each row was produced by running this calculator.
| Value | Crore → Million | Input |
|---|---|---|
| 0.5 | 5 | 0.5 Crore |
| 1 | 10 | 1 Crore |
| 2 | 20 | 2 Crore |
| 4 | 40 | 4 Crore |
What happens with invalid input
These messages are produced by the calculator itself, so you know what to fix.
- Value: left empty shows "Enter value." beside that field and no result.
Choosing between the Number Scale Converter and similar calculators
Each row shows what a related calculator on this site asks for and what it returns, so you can pick the one that matches your question.
| Calculator | You enter | It returns |
|---|---|---|
| [Scale Conversion Calculator](/converters/scale-conversion/) | scale denominator N, convert and length | Converted length |
| [Number Sequence Calculator](/math/number-sequence-calculator/) | sequence | Pattern |
| [Prime Number Calculator](/math/prime-number-calculator/) | number | Result |
| [Reynolds Number Calculator](/science/reynolds-number-calculator/) | fluid density, flow velocity and pipe diameter | Reynolds number |
| [Big Number Calculator](/math/big-number-calculator/) | first integer, second integer and operation | Result |
Background: unit conversion
Many customary units are defined exactly in terms of metric ones: since the 1959 International Yard and Pound Agreement an inch is exactly 2.54 cm and a pound is exactly 0.45359237 kg (NIST SP 811 lists these). So most length and mass conversions are exact apart from the rounding of the displayed result.
To convert, multiply the value by the source unit's factor to reach the base unit, then divide by the target unit's factor; the unit table on this page lists every factor used. Temperature and fuel economy are the exceptions, because they are not simple multiples.
Assumptions and limitations
- Negative values are allowed
- Zero converts to zero (except L/100 km, where zero is invalid)
- Units from different quantities cannot be converted
- Very large or tiny results switch to exponent notation
If a required value is empty, not a number, or outside its allowed range, the form marks that field with a message and shows no result instead of a misleading number. The automated checks deliberately try invalid entries for value to confirm this.
Frequently asked questions
How many lakhs in a crore?
One crore is 100 lakh.
How many crore in a billion?
A billion is 100 crore.
How is 1,00,000 written?
As one lakh, or 100,000.
What does the Number Scale Converter calculate?
Convert thousands, lakhs, crores, millions and billions. It returns Crore → Million and Input.
What formula does the Number Scale Converter use?
result = value × (factor of source ÷ factor of target), base unit: one. Every unit is defined by an exact or published factor to the base unit (one).
What does the “From” option change?
It sets how the number Scale is worked out. The choices are Ones, Thousand, Lakh, Million, Crore, Billion, Arab (100 crore) and Trillion.
What is an example of a number Scale result?
With value 1, from Crore, to Million and decimal places 4, the crore → Million is 10.
Where does the method come from?
The method follows: Indian numbering system: 1 lakh = 100 000; 1 crore = 10 000 000; International short scale: million = 10^6, billion = 10^9.
Related calculators
- Scale Conversion Calculator — Convert between model and actual lengths at a 1:N scale.
- Number Sequence Calculator — Identify an arithmetic or geometric sequence and find the next terms.
- Prime Number Calculator — Check whether a number is prime and find the next prime.
- Reynolds Number Calculator — Reynolds number and flow regime in a pipe.
- Big Number Calculator — Exact arithmetic on integers of any size.
- Resolution Scale Calculator — Scaled resolution at a percentage.
Sources
- Indian numbering system: 1 lakh = 100 000; 1 crore = 10 000 000
- International short scale: million = 10^6, billion = 10^9
Content last reviewed 2026-11-04. Formulas and worked examples are checked by automated tests against independently computed values.