Developer open-sources TypeScript library for dividend and DRIP calculations

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A developer has released dividend-math, a lightweight, zero-dependency TypeScript library containing pure functions for calculating dividend yield, payout ratio, monthly income, and dividend reinvestment plan (DRIP) projections. The library was extracted from the codebase behind dividendpayoutcalculator.com, a free browser-based tool that also includes dedicated calculators for ETFs like SCHD and QQQI. A key insight highlighted by the author is that a lower yield with strong annual dividend growth can outperform a flat high yield over a long horizon when dividends are reinvested. The library is available on npm under the MIT license and is backed by 16 unit tests covering edge cases such as zero price and zero growth inputs. Developers can install it via npm or copy the single source file directly into their projects.

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