What you can work out here
These calculators cover the two directions money usually moves: what something costs you, and what you keep. On the cost side, the sales tax calculator adds state and local tax or works backward from a receipt, and the discount calculator handles sale prices and stacked deals. On the income side, the salary calculator converts gross pay to take-home pay using your own tax rates.
For bigger decisions, the mortgage calculator shows the monthly payment and the full amortization schedule, so you can see how much of each payment is interest. The compound interest calculator does the opposite job: it shows how regular deposits grow over years rather than how debt is repaid. Both are useful before you sign anything, because the total cost over a long term is usually far larger than people expect.
How to pick the right tool
Start with the question you are actually asking. "What will I pay at checkout?" is a sales tax or discount question. "What lands in my bank account?" is a salary question. "What will this loan cost in total?" is a mortgage question. "What will I have later?" is a compound interest question.
Every page shows the formula it uses, a worked example with real numbers, and the assumptions behind the result. Where tax rules or rates change by state or country, the page says so instead of pretending one number fits everyone.
Accuracy and limits
These tools give estimates for planning and learning. Tax rules, lender fees and interest rates change, and your situation may include factors the calculator doesn't model. For decisions that matter, confirm the figures with a tax professional, your lender or your payroll department.
Last reviewed on by the Dailycaltor team.