Currency Converter
Convert currencies with a visible editable rate, inverse rate, and current, cached, stale, or manual freshness state using ECB-filtered reference data.
Interactive calculatorOpen calculatorFinance Calculators
33 interactive calculators · 0 planning guides
Compare currency, bills, discounts, and fixed-rate loan scenarios with visible rates, rounding, and assumptions.
Available calculators
Choose a focused tool, keep the method and units visible, and compare scenarios without sending deterministic inputs to a calculation server.
Tip & Split Bill Calculator
Calculate tip, group total, and per-person amount with explicit subtotal or after-tax basis and optional upward rounding.
Interactive calculatorOpen calculatorShopping Discount Calculator
Apply two sequential percentage discounts, an order coupon, quantity, and entered sales-tax rate to see final price and savings.
Interactive calculatorOpen calculatorMortgage & Loan Calculator
Estimate fixed-rate mortgage principal and interest, entered taxes, insurance, HOA, extra payments, payoff time, and annual amortization.
Interactive calculatorOpen calculatorHow this shelf is organized
Deterministic by default
Arithmetic, dates, units, bills, discounts, and loan schedules run in the browser.
Assumptions stay nearby
Every result retains its operation, unit, rate, or model boundary.
External data is dated
When a tool requests reference data, freshness and cached state appear beside the input.
All finance calculators
33 calculators and planning guides are available. 33 offer interactive results; every page explains its assumptions, scope, and limitations. Use the details on each page to choose the tool that fits your question.
Currency Converter
Convert currencies with a visible editable rate, inverse rate, and current, cached, stale, or manual freshness state using ECB-filtered reference data.
Interactive calculatorOpen calculatorTip & Split Bill Calculator
Calculate tip, group total, and per-person amount with explicit subtotal or after-tax basis and optional upward rounding.
Interactive calculatorOpen calculatorShopping Discount Calculator
Apply two sequential percentage discounts, an order coupon, quantity, and entered sales-tax rate to see final price and savings.
Interactive calculatorOpen calculatorMortgage Calculator: Payments & Amortization
Calculate fixed-rate principal and interest, entered housing costs, extra payments, and monthly or annual amortization.
Interactive calculatorOpen calculatorWeighted Average Interest Rate Calculator
Weight up to three nominal annual interest rates by entered balances. See the combined balance and a simple annual interest illustration.
Interactive calculatorOpen calculatorAuto Loan Calculator
Car loan payment with trade-in value, payoff owed, cash down, sales tax and fees you enter: amount financed, total interest, total paid and negative equity.
Interactive calculatorOpen calculatorBalance Transfer Calculator
Compare a balance transfer with keeping the card: transfer fee, promo and post-promo APR, balance left when the promo ends, payoff months and total savings.
Interactive calculatorOpen calculatorCommercial Loan Calculator
Calculate the payment on a commercial real estate or business term loan with separate amortization and maturity, the balloon due, and interest before it.
Interactive calculatorOpen calculatorCompound Interest Calculator
Project future value from a deposit and regular contributions at a hypothetical rate, with annual to daily compounding, start or end timing, APY and a yearly table.
Interactive calculatorOpen calculatorCredit Card Payoff Calculator
See how many months a credit card balance takes to pay off, total interest and total paid, with a fixed payment or a minimum-payment rule and new monthly charges.
Interactive calculatorOpen calculatorCredit Utilization Calculator
Work out credit card utilization for up to four cards and overall, the highest single-card ratio, and the paydown needed to reach a utilization target you choose.
Interactive calculatorOpen calculatorDebt Consolidation Calculator
Compare paying up to four debts as they are with one consolidation loan: payoff time, total interest, the new payment, fees and the true difference in total cost.
Interactive calculatorOpen calculatorDebt-to-Income Calculator
Calculate front-end and back-end debt-to-income ratios, the largest housing payment your chosen DTI limits allow, and the loan amount that payment supports.
Interactive calculatorOpen calculatorDSCR Calculator
Calculate DSCR by the NOI method or the rent ÷ PITIA method, with cash flow, a rent sensitivity table and the maximum debt service and loan for a target DSCR.
Interactive calculatorOpen calculatorFIRE Calculator
Find your FIRE number and Barista FIRE number from spending and an entered withdrawal rate, and the years to reach each at an entered real return.
Interactive calculatorOpen calculatorHELOC Payment Calculator
Estimate HELOC interest-only payments during the draw period, the amortizing payment after it, the payment jump, and how a rate increase changes them.
Interactive calculatorOpen calculatorHome Sale Proceeds Calculator
Estimate net proceeds from selling a home after mortgage payoff, agent commission, closing costs, transfer tax, credits, repairs and your own tax estimate.
Interactive calculatorOpen calculatorLease vs Buy Car Calculator
Compare a car lease payment and total lease cost with buying on a loan over the same months, using your residual, money factor, APR and resale value.
Interactive calculatorOpen calculatorLoan APR Calculator
Find the interest rate implied by a loan payment, or estimate APR when fees are paid at closing, with total interest and total finance charge.
Interactive calculatorOpen calculatorLoan-to-Value Calculator
Calculate LTV and combined LTV from a property value and loan balances, plus equity, room to borrow up to a target CLTV, or the paydown needed to reach it.
Interactive calculatorOpen calculatorMortgage Comparison Calculator
Compare two home loan offers or a refinance against your current loan: monthly P&I, fees, balance left and net cost over the months you expect to keep the loan.
Interactive calculatorOpen calculatorMortgage Points Calculator
Compare a mortgage with and without discount points: cost of points, both payments, monthly savings, break-even months and net savings over the years you keep it.
Interactive calculatorOpen calculatorPMI Calculator
Estimate monthly PMI from your quoted premium rate, starting LTV, and the scheduled payment when the balance reaches the cancellation LTVs you enter.
Interactive calculatorOpen calculatorPrecious Metal Value Calculator
Melt value of gold, silver or platinum from weight, karat or fineness and a spot price you enter, with fine metal weight, price per gram and a buyer offer.
Interactive calculatorOpen calculatorRent Affordability Calculator
Compare rent by a percent-of-income rule you set with rent left in your monthly budget after debts, essentials, savings and utilities, and the income a rent needs.
Interactive calculatorOpen calculatorRental Property ROI Calculator
Rental property NOI, cap rate, mortgage payment, annual cash flow, cash-on-cash return and year-one total ROI with principal paydown, from your own entries.
Interactive calculatorOpen calculatorRetirement Withdrawal Calculator
Model a retirement drawdown at a constant entered return: ending balance, year the money runs out, total withdrawn and a year-by-year table.
Interactive calculatorOpen calculatorSalary Calculator
Convert an hourly wage to annual salary or a salary to hourly, with daily, weekly, biweekly, semimonthly and monthly gross pay, unpaid weeks and a bonus.
Interactive calculatorOpen calculatorSales Tax and VAT Calculator
Add sales tax or VAT to a net price, or remove it from a tax-inclusive price, at a rate you enter, with quantity totals and the common reverse-tax mistake shown.
Interactive calculatorOpen calculatorTax-Equivalent Yield Calculator
Convert a tax-exempt bond yield to its tax-equivalent yield with federal and state rates you enter, and compare it with a taxable alternative after tax.
Interactive calculatorOpen calculatorBrokerage Fees & Trade Break-Even Calculator
Enter buy and sell transaction fees for an unleveraged trade to see cash outlay, proceeds, net return and break-even sale price with optional price ticks.
Interactive calculatorOpen calculatorHousehold Budget Calculator
Reconcile take-home income, ordinary expenses and separate savings or extra-debt allocations using monthly and annual totals for each category.
Interactive calculatorOpen calculatorSBA 504 Financing Scenario Calculator
Model entered bank and CDC loan terms, borrower equity, financed and cash-paid fees, monthly cash flows and a bank balloon for an SBA 504 scenario.
Interactive calculatorOpen calculator