---
title: "Mathematical precision in Javascript"
url: https://daily.dev/posts/mathematical-precision-in-javascript-zwkniwuun
source_url: https://chenhuijing.com/blog/mathematical-precision-in-javascript/
type: article
source: "Chen Hui Jing"
published: 2026-03-19T15:31:37.993Z
updated: 2026-03-19T15:32:06.444Z
tags: ["javascript", "blockchain"]
reading_time: 9
upvotes: 0
comments: 0
language: en
---

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# Mathematical precision in Javascript

**[Chen Hui Jing](https://daily.dev/sources/chenhuijing)** · 9 min read · 0 upvotes · 0 comments

## Summary

A practical walkthrough of handling financial precision in JavaScript when working with blockchain-based stablecoins like USDC. Covers why floating-point arithmetic fails for token amounts with many decimals, and presents two TypeScript helper functions using BigInt: `toUsdcSubunits()` to convert human-readable USDC strings to integer subunits, and `formatUsdcSubunits()` to display subunit values with configurable decimal places. Also includes a real-world example of calculating transaction fees expressed in basis points using BigInt arithmetic to avoid precision loss.

## Full article

daily.dev links to this article rather than hosting it. Read it at the original source: <https://chenhuijing.com/blog/mathematical-precision-in-javascript/>

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---

Tags: [#javascript](https://daily.dev/tags/javascript), [#blockchain](https://daily.dev/tags/blockchain)

[View this post on daily.dev](https://daily.dev/posts/mathematical-precision-in-javascript-zwkniwuun)