GoModo About
Mission & Purpose

Everyday Math & Finance,
Reimagined for Speed & Clarity.

GoModo US is a dedicated web utility studio designed to provide 100% free, private, and instant online calculators. We believe everyday domestic and financial calculations should never require app installations, subscriptions, or invasive data collection.

Our 3 Core Principles

100% Client-Side Privacy

All calculations run locally inside your browser sandbox. We never transmit, store, or sell any of your numbers, financial figures, or personal inputs.

Official Tax & NIST Standards

Our calculators strictly adhere to current IRS publication guidelines, 2026 federal brackets, 50-state tax laws, and NIST metric conversion factors.

Zero Bloat, Blazing Speed

Built without bloated multi-megabyte frontend frameworks. Loads instantaneously across desktop, iPhone, Android, and tablets.

Featured US Tools Lineup

1. US Mortgage & PITI Calculator Live FRED 30-year mortgage rates, monthly PITI (Principal, Interest, Property Taxes, Insurance, PMI), and full amortization schedule 2. Compound Interest & Wealth Simulator Monthly contributions, S&P 500 / NASDAQ return presets, inflation-adjusted purchasing power, and FIRE 4% rule monthly payouts 3. Powerball & Mega Millions Tax Calculator Cash option vs 30-year annuity, mandatory federal 24% withholding + 37% top rate adjustment, and all 50 state tax deductions 4. Everyday US Unit Converter NIST-compliant conversion between Imperial and Metric: lbs to kg, miles to km, °F to °C, gallons to liters, and cooking measurements 5. US Tip & Split Bill Calculator 15%–25% dining presets, pre-tax subtotal tipping, rounding options, and 1-click Venmo / text receipt copy

Official Data Sources & E-E-A-T Integrity

All financial algorithms on GoModo US reference official statutory federal codes, federal reserve economic data, and authoritative institutional research.

Federal Reserve Bank of St. Louis (FRED)

Live primary mortgage market survey rates (MORTGAGE30US) updated weekly via automated pipeline.

Internal Revenue Service (IRS)

IRC § 3402 withholding schedules, Publication 505 tax brackets, and individual state tax departments.

The Trinity Study (Retirement Research)

Safe withdrawal rate empirical analysis (Cooley, Hubbard, Walz) for sustainable 4% FIRE retirement distributions.

National Institute of Standards & Tech (NIST)

NIST Handbook 44 conversion specifications for physical weight, distance, volume, and temperature.

Contact & Feedback

Have feedback, suggestions for a new calculator, or discovered a bug? We welcome your input and inquiries.

Team: GoModo Project Team
Email: support@gomodo.cloud
Source: github.com/ryon-z/useful
Response Time: We aim to respond within 24–48 business hours.