MikeMcl/decimal.js

Health v2 · maintenance only

Flags: no_releases

Adoption not part of the score

7249 stars · 496 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

decimal.js is an arbitrary-precision Decimal type for JavaScript, supporting integers and floats with configurable significant-digit precision. It replicates many Number and Math methods, adds trigonometric functions and non-integer powers, and has no dependencies.

Use cases

• do precise decimal arithmetic for money without floating-point errors
• compute with very large or very small numbers in JavaScript
• calculate trig functions at high precision
• round numbers to a fixed number of significant digits
• parse and format numbers in hex, binary, or octal
• replace Java BigDecimal in a JavaScript port

When to choose

• you need significant-digit precision and rounding on all operations
• you need trigonometric functions, logs, or non-integer powers with arbitrary precision
• you want a dependency-free library with wide browser and Node compatibility
• you need TypeScript declarations

When to avoid

• you only need decimal-place rounding and a smaller bundle (use bignumber.js or big.js)
• you need integer-only arithmetic (use BigInt)
• you need a lighter version without trig functions (use decimal.js-light)

Facets

library · maturity stable

math serialization developer-tools web-development mathematics browser cross-platform arbitrary-precision decimal-arithmetic bignumber floating-point typescript-definitions nodejs

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