Finance
This hub covers the full spread of everyday money math, from income tax and paycheck withholding to mortgage affordability, retirement savings, and small business planning. Each subcategory below groups a specific slice of that work, whether you're comparing a car loan against a mortgage or working out your effective tax rate after deductions. Every calculator here is built from IRS, HMRC, and other regulatory publications rather than rough estimates.
Categories in Finance
Personal Finance
Net worth, budgeting, an emergency fund, or how close you are to financial independence with the FIRE Calculator: the everyday household-finance toolkit, no finance background required.
Taxes
Two calculators live here: an Income Tax Calculator for estimating federal liability from gross income and filing status, and a VAT Calculator covering both the forward and reverse value-added tax math used across dozens of countries. Both pull their brackets and rates from published government sources rather than rough approximations.
Sales
Applying a discount or markup, calculating commission, working out gross margin, and converting a percent-off deal into a final price: retail math for shoppers checking a deal and business owners pricing inventory alike.
Mortgage & Real Estate
The ARM Mortgage Calculator is the first tool in this subcategory, modeling how an adjustable-rate mortgage's payment changes after its initial fixed period ends. More mortgage and real-estate calculators, including fixed-rate and refinance tools, are planned.
Tax and Salary
Converting a salary to an hourly rate, estimating your tax bracket, self-employment tax, and the difference between your marginal and effective tax rate: income and payroll math built around current published tax bracket data.