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The complete index

Every calculator, in one place.

198 free calculators covering housing, borrowing, saving, retirement, investing, options, dates, time, business and everyday maths. Every one runs in your browser, states its formula and saves nothing.

01

Housing and property

Buy, borrow against or refinance a home, and test the numbers before committing.

Mortgage calculatorMortgage affordability calculatorAmortization calculatorRefinancing calculatorRent versus buy calculatorHome equity & HELOC calculatorCost per square foot comparison
02

Debt and borrowing

Work out what a loan actually costs across its full term.

Loan payment calculatorEMI calculatorAPR calculatorDebt payoff calculatorCash flow calculatorCar cost calculator
03

Saving and planning

Build a balance towards a target, a buffer or a retirement date.

Compound interest calculatorSavings goal calculatorSIP calculatorEmergency fund plannerEducation savings calculatorNet worth calculatorInsurance needs calculatorFinancial health scoreFixed deposit calculatorRecurring deposit calculatorPPF calculator
04

Retirement and independence

Model the accumulation years and the withdrawal years separately.

Retirement calculatorFIRE calculatorSWP withdrawal calculatorNPS calculator
05

Investing and growth

Compare returns, fees, cost basis and the effect of holding longer.

CAGR calculatorInvestment fee calculatorPortfolio allocation calculatorDividend calculatorCost basis calculatorStock profit calculatorIf I had invested calculatorGold & commodity calculatorStock grant & RSU vesting calculator
06

Options and derivatives

Model a position's payoff, pricing and probability before capital is at risk.

Browse the strategy atlas
Options strategy builderOptions profit calculatorGreeks calculatorProbability calculatorScenario analyzerOption price calculatorWheel strategy calculatorMargin buying power calculatorAll 37 option strategies
07

Tax, inflation and currency

Adjust for tax, purchasing power and the currency a figure is quoted in.

Income tax estimate calculatorIndia income tax calculatorGST calculatorInflation calculatorCurrency converter
08

Date calculators

Count days, weeks, months, years and ages between any two dates.

Open the date hub
Date calculatorDays between dates calculatorBusiness days calculatorWeeks between dates calculatorMonths between dates calculatorAge calculatorCountdown calculatorDate difference calculatorDays until date calculatorDays since date calculatorHours between dates calculatorYears between dates calculatorAge difference calculatorAge in days calculatorWeek number calculator
09

Time calculators and converters

Convert zones, measure durations and plan across working hours.

Open the time hub
Time zone converterTime zone difference calculatorWorld clockMeeting time plannerUTC time converterTime difference calculatorWorking hours calculatorUnix timestamp converterHours calculatorTime card calculatorMilitary time converterAdd time calculatorIST to EST time converterIST to PST time converterIST to CST time converterIST to UTC time converterEST to IST time converterPST to IST time converterUTC to IST time converter
10

Everyday maths

Percentages, ratios, discounts and pay — the arithmetic behind daily choices.

Percentage change calculatorPercentage difference calculatorUnit-price comparison calculatorDiscount and final-price calculatorSalary raise calculatorOvertime pay calculatorRatio calculatorCommission calculator
11

Business and marketing

Price, margin, acquisition and advertising maths for operators who want the assumptions in view.

Open the utilities hub
Break-even calculatorGross margin calculatorMarkup vs margin calculatorROAS calculatorCustomer acquisition cost calculatorLTV to CAC ratio calculator
12

Home projects

Estimate area, coverage and material quantities before pricing a room, floor, slab or roof.

Square-footage calculatorPaint calculatorFlooring calculatorConcrete calculatorRoofing-material calculatorCost-per-square-foot comparison calculator
13

Energy and solar

Translate watts, usage, tariffs and system costs into practical daily, monthly and lifetime estimates.

Electricity cost calculatorAppliance running-cost calculatorSolar payback calculator
14

Cars, fuel and EVs

Compare the recurring costs behind driving, charging, leasing, buying and vehicle ownership.

Fuel-cost calculatorEV charging-cost calculatorEV vs petrol/gas cost comparison calculatorCar depreciation calculatorLease vs buy car comparison calculatorCost-per-mile calculator
15

More tools

Additional calculators from the reference desk.

Paycheck CalculatorTake-Home Pay CalculatorSalary CalculatorHourly to Salary CalculatorBiweekly Paycheck CalculatorMonthly Paycheck CalculatorSalary to Hourly CalculatorOvertime CalculatorBonus Tax Calculator401(k) Contribution CalculatorAuto Loan CalculatorCar Payment CalculatorUsed Car Payment CalculatorAuto Financing CalculatorAuto Loan Payoff CalculatorAuto Loan Refinance CalculatorAuto Loan Amortization CalculatorTrade-in and Loan CalculatorCar Affordability CalculatorLease vs Buy CalculatorMortgage Payoff CalculatorExtra Mortgage Payment CalculatorDown Payment CalculatorClosing Cost CalculatorProperty Tax CalculatorCredit Card Interest CalculatorCredit Card APR CalculatorCredit Card Minimum Payment CalculatorDebt Snowball CalculatorDebt Avalanche CalculatorBalance Transfer CalculatorCredit Card Payment CalculatorCredit Card Payoff CalculatorInvestment CalculatorROI CalculatorInvestment Return CalculatorInvestment Growth CalculatorDividend Reinvestment CalculatorExpense Ratio CalculatorCapital Gains CalculatorFuture Value CalculatorPresent Value CalculatorCompound Interest With Inflation CalculatorCompound Interest With Taxes CalculatorSimple vs Compound Interest CalculatorSavings Interest CalculatorHigh-Yield Savings CalculatorAPY CalculatorCD Interest CalculatorSavings Account CalculatorRoth IRA CalculatorTraditional IRA CalculatorRoth vs Traditional IRA CalculatorRequired Minimum Distribution CalculatorRetirement Income CalculatorRetirement Contribution CalculatorRetirement Age CalculatorMonte Carlo Retirement Calculator401(k) CalculatorRetirement Withdrawal CalculatorCPI CalculatorHistorical Inflation CalculatorInflation-Adjusted Salary CalculatorPersonal Loan CalculatorStudent Loan CalculatorBusiness Loan CalculatorDebt Consolidation CalculatorFixed-Payment Loan CalculatorLoan Repayment CalculatorLoan Payoff CalculatorExtra-Payment Loan CalculatorLoan Comparison CalculatorInterest-Only Loan CalculatorAuto Loan Down Payment CalculatorSavings CalculatorInterest Rate CalculatorCD CalculatorRate of Return CalculatorAPR to Monthly Rate CalculatorAPY to Interest Rate CalculatorBasis Points CalculatorEffective Interest Rate CalculatorPercentage to Decimal CalculatorFraction to Percentage CalculatorDollar Inflation Calculator

Beyond the calculators

Guides

Plain-language explanations of the formulas and methods behind these tools.

Read the guides →

Compare

Side-by-side breakdowns of the choices these calculators usually sit between.

Browse comparisons →

Decisions

Answer-first frameworks for the questions people actually search for.

Open the decisions desk →

Glossary

Definitions for every term used across these tools, from APR to options Greeks.

Browse the glossary →