Financial Calculators
Estimate loan payments, compound interest growth, and sales tax — instant, browser-based money math with no sign-up.
Money questions tend to arrive at inconvenient moments: comparing two loan offers, working out whether a savings plan will reach a goal, or checking the tax on a purchase. Each one is a quick calculation, but the formulas are easy to get wrong by hand and most online tools want an email address before they show you a number.
These calculators do the arithmetic instantly and entirely in your browser. Nothing you type is uploaded, so you can use real balances and amounts without worrying about where the data goes. They are built for fast, repeatable comparisons — change one input and watch the result update.
The results are estimates for planning and comparison, not financial advice. For decisions that carry real consequences, confirm the numbers with your lender, bank, or a qualified advisor.
Calculators in this category
Loan Calculator
Calculate the monthly payment, total interest, and payoff total for any fixed-rate loan or mortgage.
Open calculator →Compound Interest Calculator
See how savings or investments grow over time with compound interest and optional regular contributions.
Open calculator →Sales Tax Calculator
Add sales tax to a price to find the tax amount and the total with tax.
Open calculator →Frequently Asked Questions
Are these financial calculators accurate?+
They use the standard formulas — amortization for loans, the compound interest formula for savings growth — and round to cents. They are accurate for estimation and comparison, but real-world loans and accounts include fees, rounding rules, and rate changes that a calculator cannot know. Treat the results as a close estimate, not a quote.
Is my financial information sent anywhere?+
No. Every calculator here runs entirely in your browser using JavaScript. The numbers you enter — loan amounts, balances, rates — never leave your device and are never stored, which makes these safe to use with real figures.
How does loan amortization work?+
A fixed-rate loan is repaid in equal monthly payments. Early on, most of each payment goes to interest; as the balance falls, more goes to principal. The Loan Calculator computes the fixed payment that pays the loan off exactly over the term, then totals the interest you pay along the way.
Why does compound interest grow so fast over time?+
With compound interest, each period you earn interest on your previous interest, not just your original deposit. Over short periods the effect is small, but over years or decades the growth curve steepens dramatically — which is why starting early matters more than the exact rate.