How many money & Finance tools are there?

74: Mortgage Calculator, Loan Calculator, Auto Loan Calculator, Personal Loan Calculator, Student Loan Calculator, Business Loan Calculator, Boat Loan Calculator, Home Equity Loan Calculator and more. Each one shows the formula or rule it uses, so you can check the answer rather than trusting it.

Which money & Finance tool should I use first?

Mortgage Calculator is the most used on the shelf: monthly payment on a home loan, including tax, insurance, HOA and PMI. Every tool works the same way, with inputs at the top and the working underneath the answer.

Is it free, and is my data stored?

Free and private. The calculation runs in your browser, so figures never leave your device, there is no account, and no calculation is logged.

Mondo Knows Tools

Free Money & Finance Calculators for Loans, Savings, Pay & Tax

Work out what a loan really costs, how far a monthly saving will stretch, or what a raise does to your take-home pay. These free finance calculators cover borrowing, saving, investing, tax and pay, and each one shows the formula it uses so you can check the numbers yourself.

74 free tools on this shelf, all running in your browser

401(k) CalculatorBalance at retirement with your contributions and employer match.Amortization CalculatorSee how each payment splits between interest and principal.Annuity CalculatorFuture value of a series of level payments.Annuity Payout CalculatorTurn a lump sum into a steady monthly income.APR CalculatorThe true annual cost of a loan once fees are included.Auto Lease CalculatorMonthly lease payment from cap cost, residual and money factor.Auto Loan CalculatorMonthly car payment with trade-in, down payment and sales tax.Auto Loan with TaxCar payment with trade-in, down payment and sales tax rolled in.Average Return CalculatorArithmetic vs geometric average of a series of returns.Boat Loan CalculatorMonthly payment on a boat or marine loan.Bond CalculatorPrice a bond from its coupon, term and market yield.Budget CalculatorSee what is left each month, and how it lines up with 50/30/20.Business Loan CalculatorPayment on a fixed-rate business loan.Cash Back vs Low Interest CalculatorIs a rebate better than a lower rate?CD CalculatorCertificate of deposit growth to maturity.College Cost CalculatorWhat college could cost by the time you get there.Commission CalculatorCommission on a sale, with an optional base salary.Compound Interest CalculatorGrowth with compounding and optional regular deposits.Cost of Living ComparisonWhat a salary in one city is worth in another.Credit Card Minimum Payment CalculatorThe real cost of paying only the minimum each month.Credit Card Payoff CalculatorHow long a balance takes to clear, and what the interest costs.Currency ConverterConvert with live mid-market rates, or type the rate your bank quoted.Debt Consolidation CalculatorCompare your current debts with a single consolidated loan.Debt Payoff CalculatorPayoff time when you fix your payment above the interest.Debt-to-Income Ratio CalculatorThe ratio lenders look at before saying yes.Depreciation CalculatorStraight-line or declining-balance depreciation.Discount CalculatorSale price and savings from a percentage off.Down Payment CalculatorHow much to put down, and how PMI changes with it.Estate Tax CalculatorFederal estate tax on a large estate.FHA Loan CalculatorFHA payment with its low down payment and mortgage insurance.Finance CalculatorSolve for any single unknown in a loan or savings formula.Future Value CalculatorWhat today's money becomes at a given rate.HELOC CalculatorHow much you could borrow against your home equity.Home Equity Loan CalculatorPayment on a fixed-rate home equity loan.House Affordability CalculatorThe home price that fits your income and debts.Income Tax CalculatorUS federal income tax from the 2025 brackets.Inflation CalculatorWhat money is worth later, and what later money is worth now.Interest CalculatorSimple or compound interest on a balance.Interest Rate CalculatorFind the rate hiding in a loan's payment and term.Investment CalculatorProjected value of an investment with regular contributions.IRA CalculatorGrowth of a traditional or Roth IRA with yearly contributions.IRR CalculatorInternal rate of return from a series of cash flows.Lease CalculatorGeneric lease payment estimate.Loan CalculatorPayment, total interest and total cost for any fixed-rate loan.Margin CalculatorGross margin, markup and profit from cost and revenue.Marriage Tax CalculatorThe marriage bonus or penalty on two incomes.Mortgage CalculatorMonthly payment on a home loan, including tax, insurance, HOA and PMI.Mortgage Payoff CalculatorHow extra payments shorten a mortgage and cut interest.Mutual Fund CalculatorSee the drag that fund fees put on long-term growth.Payback Period CalculatorHow long until an investment pays for itself.Paycheck by StateWhat actually lands in your account, state by state, after tax and FICA.Payment CalculatorSolve for the monthly payment on any loan.Pension CalculatorDefined-benefit pension from salary, service and multiplier.Personal Loan CalculatorMonthly payment and cost of an unsecured personal loan.Present Value CalculatorWhat a future sum is worth today.Real Estate CalculatorQuick return check on a property purchase.Refinance CalculatorMonthly savings and break-even on a refinance.Rent CalculatorRent as a share of income, against the 30% rule.Rent vs Buy CalculatorA simple long-run comparison of renting and buying.Rental Property CalculatorCap rate and cash flow for a rental.Repayment CalculatorWhat it takes to repay a fixed balance at a given rate.Retirement CalculatorProjected nest egg and the income it could support.RMD CalculatorRequired minimum distribution from a retirement account.ROI CalculatorReturn on investment, with an optional annualised figure.Roth IRA CalculatorRoth growth and what the tax-free withdrawals could be worth.Salary CalculatorConvert between hourly, weekly, monthly and yearly pay.Sales Tax CalculatorAdd sales tax to a price, or work backwards to the pre-tax price.Savings CalculatorHow a savings balance grows with regular deposits.Simple Interest CalculatorInterest that never compounds, straight from the formula I = P r t.Social Security CalculatorRough estimate of a US retirement benefit from your earnings.Student Loan CalculatorPayment and total interest on a student loan.Take-Home Pay CalculatorEstimate net pay after federal tax, FICA and retirement.VA Mortgage CalculatorVA loan payment including the funding fee.VAT CalculatorAdd or remove value added tax.

Questions people ask

How many money & Finance tools are there?: 74: Mortgage Calculator, Loan Calculator, Auto Loan Calculator, Personal Loan Calculator, Student Loan Calculator, Business Loan Calculator, Boat Loan Calculator, Home Equity Loan Calculator and more. Each one shows the formula or rule it uses, so you can check the answer rather than trusting it.
Which money & Finance tool should I use first?: Mortgage Calculator is the most used on the shelf: monthly payment on a home loan, including tax, insurance, HOA and PMI. Every tool works the same way, with inputs at the top and the working underneath the answer.
Is it free, and is my data stored?: Free and private. The calculation runs in your browser, so figures never leave your device, there is no account, and no calculation is logged.