Simple, High-Speed Financial Calculators for the United States
Ad-light, clean calculation engines built for American workers, homeowners, and investors. All tax math and financial computations happen 100% inside your browser memory.
Hourly & Salary Paycheck Calculator
Calculate exact take-home pay after Federal withholding, FICA (Social Security & Medicare), and State income taxes across all 50 states.
Mortgage & Amortization Calculator
Calculates Principal, Interest, State Property Taxes, Home Insurance, and automatic PMI drop-off at 80% LTV under federal HPA guidelines.
401(k) Retirement & Match Simulator
Model your compound 401(k) nest egg with employer match formulas, legal 2025/2026 contribution limits, and 4% rule monthly income.
US Sales Tax by State & ZIP
Calculate combined state, county, and local sales tax with reverse receipt extraction and grocery/clothing exemption logic.
College & High School GPA Calculator
Calculate unweighted 4.0 college GPA, AP/Honors weighted 5.0 scale, cumulative credit blending, and target GPA solver.
Compound Interest & S&P 500 Simulator
Project long-term wealth accumulation with recurring deposits, daily/monthly compounding, Rule of 72, and inflation adjustments.
Auto Loan & Lease vs. Buy Calculator
Calculate monthly car loan payments with state auto sales tax, trade-in credit, doc fees, and compare buying vs leasing side-by-side.
Credit Card Payoff & Debt Trap Calculator
Calculate exact payoff timeline, interest saved with fixed payments, and compare minimum payment traps vs debt acceleration.
Dining Tip & Bill Split Calculator
Fast pre-tax and post-tax tipping presets (15%, 18%, 20%, 25%) with multi-guest bill splitting and 1-click Venmo text copying.
Student Loan Repayment & SAVE Plan
Compare Standard 10-Year, SAVE IDR plans, Extended 25-Year, and private refinancing with extra payments and IRS deduction modeling.
US Inflation & Purchasing Power Calculator
Calculate past purchasing power changes from 1913 to 2026 using official BLS CPI data, or simulate future cash purchasing power erosion.
Rent vs. Buy & Breakeven Horizon
Compare 30-year net wealth of buying a home vs renting and investing down payment cash into the S&P 500 index fund.
Home Affordability & Max Price
Calculate how much home you qualify for based on household income, monthly debt obligations, and lender DTI caps.
Roth IRA vs. Traditional IRA
Compare upfront tax deductions versus 100% tax-free retirement growth, optimize your lifetime wealth, and find your tax breakeven.
Capital Gains Tax & Net Profit
Calculate federal, state, and NIIT (3.8%) capital gains taxes on stocks, cryptocurrency, and Section 121 primary home sales.