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