A walkthrough, end to end.
- 1
Enter two integers of any size (commas and underscores are stripped).
- 2
Choose +, −, ×, ÷, mod, or ^ (power).
- 3
See the exact result with digit count and sign.
BigInt arithmetic
JavaScript's BigInt represents integers without size limits (memory-bound). Exponentiation is supported up to a safety cap of 10,000 to prevent runaway computation.
What you can do with this.
Factorials
100! has 158 digits — too large for normal arithmetic, exact here.
Combinatorial counts
Compute C(100, 50) exactly without floating-point error.
Crypto sanity checks
Multiply or compare 256-bit values exactly.
Beyond Number.MAX_SAFE_INTEGER
Above 2^53, regular numbers lose precision; BigInt does not.
Exact powers
2^200 or 3^100 with no scientific-notation rounding.
Modular arithmetic
Compute remainders mod huge numbers exactly.
Verifying Python/Wolfram math
Quickly cross-check large integer answers.
Big numbers 2026 — what's current
BigInt is the modern standard for exact integer math in browsers.
Frequently asked.
BigInt is integer-only. Use the basic calculator for decimal arithmetic.
Exponent capped at 10,000 for safety. Larger ones can be computed with custom code.
Yes — leading minus signs are accepted.
No. Calculations run entirely in your browser.