Big Number Calculator
Add, subtract, or multiply integers of any size — even numbers with 100+ digits — using exact arithmetic.
About Big Number Arithmetic
Standard floating-point numbers (like JavaScript's Number type) can only represent integers exactly up to 2^53 − 1 (about 9 quadrillion). Beyond that, precision is lost. BigInt is a JavaScript built-in that supports arbitrary-precision integers, allowing exact computation with numbers of any size.
Applications of Big Number Math
Big number arithmetic is essential in cryptography (RSA keys use 1024–4096 bit numbers), number theory (prime factorization, modular arithmetic), competitive programming, and any domain requiring exact integer results beyond the range of standard types. Factorials, Fibonacci numbers, and combinatorial coefficients can easily exceed standard integer limits.
Limitations
This calculator supports addition, subtraction, and multiplication. Division of big integers is not included because it may produce non-integer results that require arbitrary-precision decimals (different from BigInt). For very large multiplications (thousands of digits), computation may take a moment. Negative numbers are fully supported.
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For a related calculation, use Number Sequence Calculator to calculate the nth term, sum, and list of terms for arithmetic and geometric sequences. Alternatively, use Long Division Calculator to perform integer long division with a full step-by-step walkthrough of each bring-down, multiply, and subtract step.