Financial Calculators
Most money questions come down to one number you cannot see yet: the monthly payment, the take-home figure, the balance after ten years of compounding. This section gathers the calculators people reach for when that number decides something — whether a house is affordable, how long a credit card balance will take to clear, what a raise is actually worth after deductions. Each one shows the formula it applies and the assumptions behind it, so you can check the math rather than trust a mystery box.
Start from the situation. House hunting in the US or UK: the Mortgage Calculator handles the repayment schedule, the Home Affordability Calculator works backward from income, and the Stamp Duty Calculator covers the UK purchase tax that catches buyers out. Weighing a job offer: the Paycheck Calculator estimates take-home pay. Digging out of debt: the Debt Payoff Calculator compares avalanche and snowball order. For pricing and receipts, the Sales Tax and VAT calculators both run, because one market adds tax at the till and the other builds it in.
Read the output as an estimate, not a quote. Payment figures assume a fixed rate and ignore lender fees, insurance and property taxes that vary by state, county and council area. Payroll results depend on filing status, pension contributions and local rates that change every tax year, so treat them as a planning range rather than a promise. Investment projections use a steady return that real markets never deliver in a straight line. For anything binding, confirm the numbers with your lender, accountant or a qualified advisor.
73 free tools — all run entirely in your browser.
Frequently asked questions
How do I work out what my monthly mortgage payment will be?
Enter the loan amount, the interest rate and the term in the Mortgage Calculator; it applies the standard amortization formula and returns the principal-and-interest payment plus total interest over the life of the loan. Add property tax, insurance and any service charge separately, since lenders quote those alongside the loan but they are not part of the amortized payment.
What is the difference between the Sales Tax and VAT calculators?
Sales tax is added on top of the shelf price at checkout in the United States, and the rate depends on state and local jurisdiction. VAT is already included in UK and EU display prices, so the useful operation is usually stripping it back out to find the net amount. The two calculators reflect that: one adds, the other can add or remove.
Are these calculators accurate enough to make a decision on?
The arithmetic is exact and each tool states its formula, so the results are as accurate as the inputs and assumptions you give it. What they cannot know is your lender's fee schedule, your exact tax withholding or next year's rates. Use them to compare options and rule out non-starters, then confirm the final figure with the institution or professional involved.