Transparency

About ROI Calculator

An independent, math-first web resource built for clear, transparent financial calculations.

What Is ROIcalculator.site?

ROIcalculator.site is an independent digital calculator resource created to help individuals, investors, students, and business owners calculate return on investment quickly, accurately, and without friction.

We operate this site as an independent computational utility rather than a financial advisory firm. We do not sell investment products, manage client portfolios, or collect sensitive personal banking information.

Founder & Lead Quantitative Engineer

AM

Alex Morgan

Founder, Software Engineer & Financial Calculation Modeler

Alex Morgan is a software engineer specializing in algorithm engineering, deterministic client-side calculation architectures, and transparent financial modeling tools. With extensive experience building high-performance web systems and numerical applications, Alex founded ROI Calculator to replace ad-bloated, opaque financial widgets with clean, mathematically proven open calculators that respect user privacy.

Primary Focus:Quantitative algorithms, CAGR modeling & unit economics
Verification Source:GitHub Repository ↗

What the Website Provides

The website offers three focused, standalone financial calculators alongside explanatory educational guides:

  • ROI Calculator — Evaluates initial capital outlays, final returns, ongoing costs, and net profit percentages.
  • Annualized ROI / CAGR Calculator — Standardizes multi-year or fractional-year returns into compounded annual growth rates (CAGR).
  • Investment Return Calculator — Analyzes capital contributions, cash distributions (dividends), and the impact of annual fee drag.

Why These Calculators Were Created

Many online financial tools are cluttered with intrusive popups, compulsory email registrations, opaque assumptions, or hidden affiliate agendas. ROI Calculator was created to provide a fast, clean alternative:

1. Immediate UtilityGet instant results as you type, without registration, paywalls, or delays.
2. Full TransparencyEvery formula applied is shown explicitly with step-by-step mathematical substitution.
3. Complete PrivacyCalculations run locally in your browser. Your numbers are never sent to or stored on our servers.

What Calculations Are Intended For

Calculations on this website are intended solely for informational, educational, and computational modeling purposes. They provide mathematical answers based on the user's inputs.

These calculations do not constitute personalized financial, investment, tax, or legal advice. Real-world investment outcomes are subject to taxes, transaction fees, market volatility, and timing factors that generic mathematical models cannot predict.

How Formulas Are Selected & Tested

Our calculators implement standard arithmetic and corporate finance formulas (such as the simple ROI formula and the geometric CAGR equation). We cross-reference these formulas against established financial literature and public guidance from institutions including the U.S. Securities and Exchange Commission (SEC) and the CFA Institute.

Every formula is implemented in a deterministic, dependency-free calculation engine covered by automated unit tests. Our test suite systematically verifies:

  • Standard positive returns and negative returns (losses).
  • Zero-gain break-even cases and total capital loss (-100%).
  • Division-by-zero protection (e.g. zero or negative initial cost).
  • Decimal precision and extreme numeric boundaries (preventing integer overflow).
  • International number formatting with dots and commas.

Review & Maintenance Schedule

Our calculation code and educational content are reviewed on a quarterly basis to ensure mathematical correctness, browser compatibility, and compliance with modern web standards.

Last Content & Engine Review: September 2026.

Contacting the Site

We welcome constructive feedback, bug reports, and formula improvement suggestions. You can contact us through our Contact Page or by emailing contact@roicalculator.site.