Big Number Calculator
Calculate exactly with whole numbers that are too big for a normal calculator.
No rounding at any size
Normal calculators and spreadsheets store numbers with about 15 digits of accuracy, then round. This tool uses exact whole-number arithmetic, so every digit of the result is correct, even for numbers hundreds of digits long.
What it is for
- Factorials and powers, such as 2^100 or 3^200.
- Cryptography and number theory exercises.
- Checking large sums and products by hand-style methods.
Example
With the starting values shown (First number 123456789012345678901234567890; Second number 987654321; Operation Multiply (×)), Result comes out as 121932631124828532112482853211126352690. Other results include number of digits: 39.
Frequently asked questions
How big can the numbers be?
Up to 2,000 digits for each input, and results up to 5,000 digits.
Does it handle decimals?
No. Only whole numbers. For decimals, use the scientific calculator.
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