How to Use the Big Number Calculator

Enter your numbers, choose an operation, and calculate. Supported input types depend on the operation; large calculations may take longer and can be cancelled.

1. Enter the first number in the top box. You can paste numbers with thousands of digits.
2. Choose an operation: add, subtract, multiply, divide, power, modulo, factorial, GCD, LCM, square, square root, combinations (nCr), permutations (nPr), or bitwise operations.
3. Enter the second number when required. Factorial, square and square root use only the first number, so the second box is disabled.
4. Click Calculate or press Enter in either number box.
5. Review the result. Integer results include a digit count and decimal, scientific, binary, octal, and hexadecimal views. Fractional results show an exact fraction and a decimal display. Select one of 19 languages for words.
6. Copy or download the full answer as a text file.

Worked example: enter 12345678901234567890, choose Add, enter 98765432109876543210 and calculate. The result is 111111111011111111100, a 21-digit sum.

Input notes: put a minus sign in front of negative numbers, such as -500. Commas, spaces and underscores are ignored, so 1,000,000 is read as one million. Leading zeros are allowed. You can also type decimals (3.14159), scientific notation (3.5e19, 6.022E23) and hexadecimal (0xFF), binary (0b1011) or octal (0o17). Decimals are stored as exact fractions, so 0.1 + 0.2 gives exactly 0.3.