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16 calculators

Personal finance calculators

Borrowing, saving, pay, tax and selling online: every decision worked out to the cent, with the full schedule you can download.

  • Published formulas

    Every calculator implements the textbook or regulator formula.

  • Tested to the cent

    Results are pinned against spreadsheet and lender figures.

  • No sign-up, no uploads

    Inputs stay in your browser and in the link you share.

  • Sources cited

    Rates and thresholds carry their source and review date.

CentExact

Money, worked out to the cent.

Data from

  • IRS
  • HMRC
  • ECB
  • BLS
  • SSA

Popular calculators

  • Amazon FBA Fee Calculator
  • Car Loan Calculator
  • Compound Interest Calculator
  • Credit Card Payoff Calculator
  • Currency Converter
  • Debt-to-Income Ratio Calculator
  • Etsy Fee Calculator
  • Inflation Calculator

Categories

  • Borrowing6
  • Saving & investing4
  • Pay & tax3
  • Selling online3

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© 2026 CentExact. All rights reserved.Calculators are for information only and are not financial, legal or tax advice. Confirm figures with a qualified professional before acting.

Loans, mortgages and cards: the payment, the true interest cost and the payoff date.

  • Loan CalculatorPayment, total interest and a full amortisation schedule for any fixed-rate loan.
  • Mortgage CalculatorFull monthly payment with taxes, insurance and PMI, plus the complete amortisation schedule.
  • Car Loan CalculatorMonthly payment with tax, trade-in and fees, or how much car your budget can buy.
  • Credit Card Payoff CalculatorHow long a balance takes to clear, what it costs, and the payment to hit your target date.
  • Debt-to-Income Ratio CalculatorFront-end and back-end DTI, compared with the limits lenders actually use.
  • Rent vs Buy CalculatorFind the year buying overtakes renting once fees, upkeep, appreciation and investing are counted.

Growth, goals and retirement, in today's money as well as tomorrow's.

  • Compound Interest CalculatorProject how a lump sum and regular deposits grow, with APY and a year-by-year table.
  • Savings Goal CalculatorHow much to save each month, or how long it will take, to reach a target amount.
  • Retirement CalculatorProject your portfolio to retirement in nominal and today's money, with a FIRE target and age.
  • Inflation CalculatorThe value of a dollar between any two years since 1913, from official CPI data.

What you actually take home, in any pay period and any currency.

  • Take-Home Pay CalculatorSalary after income tax and FICA or National Insurance, per year, month or week.
  • Salary to Hourly CalculatorConvert between hourly, weekly, monthly and annual pay, with overtime and unpaid weeks.
  • Currency ConverterConvert 30 currencies at ECB reference rates, with the rate both ways.

Margins and marketplace fees, so you know the profit before you list.

  • Profit Margin CalculatorMargin, markup, cost or price, enter any two and get the rest.
  • Etsy Fee CalculatorEvery Etsy fee on a sale, and the profit left after your costs.
  • Amazon FBA Fee CalculatorReferral and FBA fees per unit, and the profit and ROI that remain.