Online Tools

Free calculators and utilities — finance, tax, health, networking, and reference data. All client-side, no data transmitted.

Mortgage Payment Calculator

Full breakdown with amortization, PMI, taxes, insurance, and extra payment impact

401(k) Retirement Calculator

Employer match, vesting, Roth vs Traditional, contribution limits

Net Worth Calculator

Track assets vs liabilities with history snapshots

Backtesting Simulator

See how your investment would have grown using real S&P 500 returns

Debt Payoff Calculator

Snowball vs Avalanche — compare strategies to eliminate debt faster

Compound Interest & FIRE

Project portfolio growth with inflation adjustment and FIRE target

Budget Allocator

50/30/20 rule or zero-based budgeting with visual breakdown

Emergency Fund Runway

Calculate how many months your savings cover essential expenses

Rent vs Buy Calculator

True cost comparison with taxes, PMI, HOA, and opportunity cost

US Tax Calculator

Federal + state tax, FICA, bracket waterfall, and paycheck visualization

ROI Calculator

Calculate return on investment, annualized returns, and profit/loss

Price Estimator

Project future stock prices using growth rate or P/E multiple

Word Counter

Count words, characters, sentences, and estimate reading time

Calorie & Macro Calculator

Estimate daily calories, protein, carbs, and fat targets

Unit Converter

Length, weight, temperature, area, volume, speed, data

DNS Lookup

MX, A, CNAME, TXT, NS records for any domain

IP Blacklist Check

Check if an IP is listed on 10 major RBL/DNSBL zones

US States & Capitals

All 50 states with capitals, abbreviations, population

Countries & Capitals

Countries of the world with capitals and languages