💰 Financial Calculators
Twenty-one calculators for the money decisions people actually make: what a mortgage costs per month, how much interest a loan adds, what a salary looks like after tax, and what a portfolio is worth in twenty years.
Mortgage Calculator
Monthly payment, total interest and the real cost of a home loan.
📉Amortization Calculator
How each payment splits between principal and interest, month by month.
💳Loan Calculator
Repayment, interest and payoff cost for any fixed-rate loan.
💵Payment Calculator
The fixed monthly payment behind any amount, rate and term.
🚗Auto Loan Calculator
Car payment with deposit and trade-in, and what the interest adds.
💹Interest Calculator
What a deposit earns under simple and compound interest.
📈Compound Interest Calculator
Growth of a balance plus regular contributions, at any frequency.
📊Interest Rate Calculator
Convert between nominal rate, APR and APY to compare offers.
📈Investment Calculator
Portfolio value after years of contributions and compound growth.
🏖Retirement Calculator
Your nest egg, the income it pays and the gap left over.
💰Finance Calculator
Time value of money: solve for rate, term, payment or value.
💸Inflation Calculator
What money is worth after years of rising prices.
💵Salary Calculator
Hourly to annual pay and back, with holidays accounted for.
🧾Income Tax Calculator
US federal tax by bracket, effective rate and take-home pay.
🏷Sales Tax Calculator
Add tax to a net price or pull it back out of a gross total.
🏷Discount Calculator
Sale price, savings and stacked discounts, in both directions.
🏦Savings Calculator
What a plan grows to, or the deposit a target needs.
💳Credit Card Payoff Calculator
How long a card balance takes, and what the interest costs.
📉Debt Payoff Calculator
Snowball against avalanche on your own debts.
🏠House Affordability Calculator
The price your income supports, by the 28/36 rules.
💼401(k) Calculator
Balance at retirement and how much is the employer match.
About these 21 finance tools
Every calculator here answers one question: what does this actually cost, or what will it actually be worth? The loan tools work from the standard amortisation formula, so the monthly payment they return is the one a lender would quote for the same amount, rate and term.
Start with the mortgage, loan or auto loan calculator if you are borrowing, and with the investment, compound interest or retirement calculator if you are saving. The tax tools sit between the two: they take a gross figure and show what is left after it has been taxed.
None of these are advice. They are arithmetic you could do yourself with a spreadsheet, done faster and with the working shown.