Money calculators
Loans, interest, discounts, tips, markup, savings, and inflation estimates.
Money tools here are estimates for a purchase, a loan, or a savings target. A mortgage payment on this site is principal and interest only. A discount page does not add sales tax. Compound interest ignores fees and inflation unless you lower the rate yourself.
Each page shows the formula in plain English and a worked example with round numbers so you can redo the math on paper. They are not investment, lending, or tax advice. Confirm the rate, term, and fees with the lender or the store receipt.
Discount Calculator
Calculate sale price, amount saved, and original price after a discount.
Tip Calculator
Calculate tip amount and split the bill between people.
Markup and Margin Calculator
Convert between cost, selling price, markup percent, and profit margin.
Compound Interest Calculator
Estimate compound interest on savings with annual, monthly, or daily compounding.
Mortgage Payment Calculator
Estimate monthly principal and interest on a home loan.
Auto Loan Payment Calculator
Estimate a monthly car loan payment from price, down payment, rate, and term.
Sales Tax Calculator
Add sales tax to a price or remove tax from a total.
Simple Interest Calculator
Calculate simple interest and the total amount on a loan or deposit.
Break-Even Calculator
Find how many units you must sell to cover fixed costs.
Savings Goal Calculator
Calculate the monthly deposit needed to reach a savings target.
Inflation Calculator
See what an amount is worth after years of inflation, or how much you need to match today's buying power.
Loan Payoff Calculator
See how extra monthly payments shorten a loan and cut interest.