All calculators
Every tool on Tavuna FinTool is free, runs privately in your browser, and needs no sign-up. Choose a calculator to begin.
Saving & investing
- Compound interestCompound interest pays you twice: on the money you put in, and on the interest it has already earned. Give it a few years and the balance starts climbing on its own.Open calculator
- Savings goalPick a target and a deadline. The calculator works backward and tells you how much to put away each month to get there.Open calculator
- RetirementThis calculator projects your savings from today to the age you retire, then estimates the yearly income that pot could pay you.Open calculator
- Simple interestSimple interest runs on the original amount only, never on the interest itself. Many short-term loans and some bonds work this way.Open calculator
- InflationInflation pushes prices up, so the same money buys less every year. This calculator shows what an amount will cost in the future and how much buying power it will lose.Open calculator
- ROIReturn on investment (ROI) tells you, in percent, how much an investment made or lost against what went in. It puts two completely different opportunities on one scale.Open calculator
Loans & debt
- MortgageA mortgage is the biggest loan most people will ever take. The real monthly cost doesn't stop at principal and interest: property tax, insurance, and HOA dues ride along. Budget for the full number.Open calculator
- LoanA car loan, a personal loan, student debt: they all run on the same math. You pay a fixed amount each month, interest comes out first, and the rest chips away at the balance.Open calculator
- Auto loanA car loan spreads the amount you finance across fixed monthly payments. Your down payment and trade-in shrink the loan. The rate decides how much extra you pay on top.Open calculator
- Credit card payoffA fixed monthly payment chips a card balance down over time. The higher the APR, the more of each payment goes to interest instead of the debt itself.Open calculator
Everyday math
- PercentageTips, discounts, tax, grades: percentages are everywhere. This calculator answers the three questions people ask most, no mental math required.Open calculator
- Sales taxSales tax adds a percentage of the price on top of what you pay. This calculator adds the tax to a price, or works backward and pulls the tax out of a total that already includes it.Open calculator