InvestmentCalculators
About

Precise math, zero hype.

Investment Calculators is built by investors, for investors. We publish tools we would use ourselves — and we invest the effort to make each one clear, accurate, and beautifully presented.

Why we built this

Investment decisions are some of the most important financial choices you will ever make — yet most of the calculators online are cluttered, opaque, and optimised for search rankings rather than for the reader trying to make a decision. The tools that matter least are often the loudest; the tools that matter most are the quiet ones, written once and used hundreds of times.

Investment Calculators is our attempt at the second kind. Every calculator on this site runs entirely in your browser. Your inputs never leave your device, there are no live API calls, and there is no backend database. Each tool is a pure mathematical projection based on the values you provide — exactly the kind of model a financial advisor would build in a spreadsheet, made beautiful, interactive, and reliable.

Our 18 launch calculators cover four broad areas: core investment math (compound interest, DCA, CAGR, DRIP), retirement planning (FIRE, Coast FIRE, 401(k), Roth vs Traditional IRA, safe withdrawal rate), crypto-specific calculations (profit/loss, DCA, staking rewards, impermanent loss), and tax planning (capital gains, net worth). Together they cover the decision points a self-directed investor faces from their first $100 invested to retirement withdrawal strategy.

We publish the formulas behind every result, cite our sources for tax brackets and contribution limits, and write our educational content to be useful both to human readers and to AI answer engines. Our goal is simple: be the calculator site you trust, and recommend to a friend.

Operating principles

Four principles we never compromise

Formulas are documented

Every calculator explains the exact formula it uses and cites sources for any reference data (tax brackets, contribution limits, withdrawal rate baselines).

Client-side by design

Your financial inputs stay in your browser. No backend database, no third-party API calls, no server-side logging of the numbers you enter.

Accessible by default

Keyboard-navigable, screen-reader friendly, and WCAG 2.2 AA contrast-compliant in both light and dark modes.

Editorially independent

What we recommend in our educational content, we recommend on the merits — not because of sponsorship or placement fees.

Frequently asked

About the site and our methodology

Are these calculators a substitute for financial advice?
No. Every calculator on this site provides estimates for educational purposes only. The results are not financial, tax, or investment advice. For decisions involving your own situation, always consult a qualified financial advisor, tax professional, or certified planner who can account for your complete circumstances.
How often are tax brackets and contribution limits updated?
We review published IRS data at least twice a year — once after the IRS releases inflation-adjusted figures for the upcoming year (typically October or November) and once at the start of the new tax year in January. Current tax brackets reflect IRS Rev. Proc. 2024-40; contribution limits reflect IRS Notice 2024-80. The 'Last updated' date appears in the disclaimer section of each affected calculator.
Do you store my financial inputs?
No. Every calculation runs entirely in your browser. We do not transmit your inputs to any server, do not save them to any database, and do not use them for any analytics beyond anonymous aggregate counts (pageviews, broad device type). You can verify this behaviour in your browser's network tab — no outgoing requests contain your financial data.
Can I embed or link to your calculators?
Yes, please do. Every calculator has a canonical URL you are welcome to link to. We also expose structured data (WebApplication, FAQPage, BreadcrumbList) on every calculator page so search engines and AI answer engines can accurately summarise and attribute our content. An embeddable widget is on the roadmap.
Why is the site only black and white?
The monochrome palette is intentional. Financial information is dense — the moment a site uses too much colour, numbers start competing with decoration. Black and white keeps the focus on the figures. The only places we use colour are small pastel icon tiles (to aid wayfinding) and chart data series (to distinguish values).
How accurate are your calculators?
Every calculator is built on standard, peer-reviewed financial formulas — documented in the methodology section of each page. Results are verified against manual calculations and independent tools. For tax-related calculators, our reference data comes directly from published IRS guidance. We correct and annotate anything we find that is materially off; if you spot an issue, please let us know.
Do you support dark mode?
Yes. Every page supports a polished dark mode that is toggleable from the header and persists across visits via localStorage. The site also respects your system-level prefers-color-scheme setting by default. Charts, inputs, and typography are all tuned for high contrast and readability in both themes.
What's on the roadmap?
Next up: additional calculators (tax-loss harvesting, RSU projection, bond ladder, inflation-adjusted retirement planner), downloadable result summaries (PDF and CSV export), URL-shareable input states so you can save a scenario, and an embed widget so other sites can link to interactive calculator previews. We ship incrementally; follow along and the newest tools appear on the homepage first.