Add, subtract, multiply or raise huge integers to a power — with exact, unrounded precision.
How the big number calculator works
Ordinary calculators lose precision on very large numbers. This one uses exact integer arithmetic, so results with hundreds of digits stay perfectly accurate.
Enter two whole numbers, pick an operation, and see the exact result and its digit count.
The default scenario, worked through
Worked through, a first integer of 123,456,789,012,345,677,877,719,597,056, operation of +, second integer of 987,654,321,098,765,392,283,420,327,936 produces a result of 11111111101111111110…. Alongside it, Digits comes out at 31. Change any field and every figure updates as you type.
How to use it
- Enter the first whole number.
- Choose an operation.
- Enter the second number and read the exact result.
Formula reference
exact arbitrary-precision integer arithmetic
Frequently asked questions
Why do normal calculators lose precision?
They use floating-point numbers with limited digits, so very large integers get rounded. This tool keeps every digit.
How big can the numbers be?
Very large — hundreds of digits work fine. Extremely large powers may take a moment.
Does it handle decimals?
It’s built for exact whole-number math. For decimals, use the basic or scientific tools.