Big number calculator — arbitrary-precision math
Add, subtract, multiply, divide, modulo, integer powers, square root, and absolute value with big.js precision. Paste values larger than Number.MAX_SAFE_INTEGER or exact decimals like 0.1 × 0.2 — results stay local.
Frequently asked questions
No. All big-number math runs in this tab only. Nothing is sent to LocalTools servers for processing.
Powers use big.js integer exponents only. For roots, use square root on a positive operand, or raise to an integer power and combine steps elsewhere.