Big number calculator (exact precision)
Paste two numbers, as long as you need (up to 2,000 digits). Addition, subtraction and multiplication are exact; division is given to the number of decimals you choose.
Result
121932631124828532112482853211126352690Result
- Order of magnitude
- 1.21932631124829 × 10³⁸
- Digits before the decimal point
- 39
Inputs
- First number
- 123456789012345678901234567890
- Operation
- Multiplication (×)
- Second number
- 987654321
How it is calculated
Each number is stored as an exact integer (BigInt) and a power of 10.
Result
Result
- Order of magnitude
- 1.21932631124829 × 10³⁸
- Digits before the decimal point
- 39
How it is calculated
- Each number is stored as an exact integer (BigInt) and a power of 10.
- Addition and subtraction: line up the decimal points, then compute digit by digit.
- Multiplication: exact product of the integers; the powers of 10 add up.
- Division: the whole quotient is computed to the chosen decimals, rounded half up.
Example
123456789012345678901234567890 × 987654321 = 121932631124828532112482853211126352690 (39 digits, ≈ 1.219 × 10³⁸).
Good to know
- Up to 2,000 digits per number and 12,000 digits for the result.
- Use a point (or a single comma) as the decimal mark, without thousands separators.
- No powers or roots here: see the dedicated tools.
When to use it
- Calculate large values without ordinary rounding errors.
- Multiply long integers or perform high-precision division.
Frequently asked questions
What is this tool used for?
Paste two numbers, as long as you need (up to 2,000 digits). Addition, subtraction and multiplication are exact; division is given to the number of decimals you choose.
How is the result calculated?
Each number is stored as an exact integer (BigInt) and a power of 10.
What should I check before using the result?
Up to 2,000 digits per number and 12,000 digits for the result.