Work out what a loan really costs, how fast savings grow and what lands in your bank account each month. Every tool runs instantly in your browser, shows the formula behind the result and walks through a worked example.
Start with the mortgage or loan calculator when you want a monthly payment and the total interest over the term — both use the standard amortization formula, so you can see how much of each payment goes to interest early on. Use the savings and compound interest calculators to project growth from a starting balance, a regular deposit and a rate you choose yourself. The retirement calculator carries that projection to a target age and applies the 4% withdrawal rule, while the paycheck calculator works in the other direction: from gross pay down to take-home after federal income tax, Social Security and Medicare, using the 2026 figures published by the IRS and SSA.