Arbitrary-Precision BigInt Calculator
Arbitrary-Precision BigInt Calculator: Evaluates expression using native arbitrary-precision BigInt arithmetic without floating-point rounding.
About this arbitrary-precision bigint calculator
Arbitrary-Precision BigInt Calculator — browser-based utility.
How this tool works
Calculation and parameter relationship: a+b; a−b; a×b; a%b; −5%2=−1; 5%−2=1
- Paste the sample input into “Input”.
- Click “Run locally”.
- Compare “Raw Output Data” with the example; revise inputs when an error is shown.
Worked example
Scenario: Multiply two decimal integers beyond the Number safe-integer range.
Sample input:
Processing: Parse both operands as BigInt and multiply them exactly; serialize the BigInt result as decimal text.
Illustrative output:
Limits and verification
Parameter domains and units: a,b ∈ ℤ; operation ∈ {+,−,*,%}; % ⇒ b ≠ 0; BigInt. Results use binary64 floating-point numbers unless BigInt is stated. Result cards show up to 10 significant digits; raw output retains the serialized value. A null ratio means the model has no meaningful finite value for that ratio; it is not zero.
Examples demonstrate an expected workflow; they do not prove every input or every branch of an external specification. Check important results with an independent source before using them for money, security, compliance, safety, or irreversible file changes.
Browser processing boundary
Tool input is processed by code running in the browser and is not intentionally sent to a CZOA processing API. The page can still request ordinary site assets, analytics, or advertising when those services are enabled. Browser extensions and managed-device software remain outside this tool's control.
Relevant references
These references govern or help explain the format, protocol, or calculation used here. Listing a reference does not claim certification or complete implementation of every optional feature.
- NIST Digital Library of Mathematical Functions, §1.2 — Elementary Algebra
- ECMAScript 2026, §6.1.6.1 Number Type
Content owner: CZOA Tools · Last reviewed: 2026-09-15 · Review methodology
How to use it
- Paste the sample input into “Input”.
- Click “Run locally”.
- Compare “Raw Output Data” with the example; revise inputs when an error is shown.
Frequently asked questions
How does the BigInt calculator evaluate an expression?+
It accepts exactly two signed decimal integers joined by +, -, * or %. It parses both operands as JavaScript BigInt and returns the integer result as text, so the arithmetic is not first converted through Number.
Which expressions are valid?+
Write an expression such as 90071992547409931234567890 * 9. Decimal points, exponent notation, parentheses, division and more than one operator are not accepted. A modulo divisor must not be zero.
What precision and remainder rules apply?+
BigInt has arbitrary integer precision, but it represents integers only. For %, JavaScript keeps the dividend’s sign: -5 % 2 is -1 and 5 % -2 is 1. The raw text is the authoritative representation; result cards are not used to round it.
What did the browser fixture verify?+
The independent expression 90071992547409931234567890 * 9 returned 810647932926689381111111010 exactly. This exceeds the safe integer range of Number; the fixture operated locally and recorded no submitted tool payload.