Curated Calculators
Browse practical calculators for finance, investing, tax, budgeting, ecommerce, math, statistics, age, time, BMI, and calories.
Featured calculators
A hand-picked starting point across every category.
FinanceMortgage CalculatorEstimate monthly payments, interest, taxes, insurance, PMI, and amortization using practical home-loan assumptions.Best for: Sizing up a home purchase before talking to a lender.FinanceCompound Interest CalculatorSee how savings grow as interest earns interest, with adjustable contributions and compounding frequency.Best for: Understanding the long-run power of compounding.InvestingRegular Investment CalculatorProject how regular monthly contributions grow over time — SIP-style investing, dollar-cost averaging, inflation-adjusted value, and long-term goals.Best for: Monthly investing, SIP, and dollar-cost averaging.InvestingRetirement Withdrawal CalculatorEstimate how long your savings may last with regular withdrawals — portfolio drawdown, safe withdrawal rate, inflation, and a year-by-year schedule. Also known as an SWP.Best for: Retirement income, portfolio drawdown, and how long your money will last.EverydayAge CalculatorCalculate exact age in years, months, and days from date of birth.Best for: Finding an exact age for any date.MathStandard Deviation CalculatorCompare sample and population standard deviation, variance, mean, range, and deviations from the mean.Best for: Measuring how spread out a dataset is.BusinessProfit Margin CalculatorUnderstand gross, operating, and net margin from revenue, costs, fees, and expenses.Best for: Checking how much of revenue is real profit.TaxManual Progressive Income Tax Band CalculatorEnter your own tax bands and see income taxed band-by-band, with the total, effective rate, and marginal rate.Best for: Modelling any country’s progressive tax bands.FinanceLoan CalculatorWork out the monthly payment, total interest, and payoff date for any fixed-rate loan from the amount, rate, and term.Best for: A quick payment estimate for any kind of loan.BudgetCredit Card Payoff CalculatorSee how long it takes to clear a card balance and the interest cost at your chosen monthly payment.Best for: Finding a payment that clears the card.BusinessBreak-Even ROAS CalculatorFind the ROAS your margins require to break even, so you know the floor a campaign must beat.Best for: Setting the ad-return target before you spend.TaxVAT CalculatorAdd or strip VAT at your chosen rate to see the net amount, the VAT, and the gross total.Best for: Pricing goods and invoices with VAT.
Finance calculators
Mortgages, loans, interest, savings, and retirement planning.
FinanceMortgage CalculatorEstimate monthly payments, interest, taxes, insurance, PMI, and amortization using practical home-loan assumptions.Best for: Sizing up a home purchase before talking to a lender.FinanceMortgage Refinance CalculatorCompare your current mortgage to a new rate and term to see the monthly saving and how long it takes to break even.Best for: Deciding whether refinancing is worth the closing costs.FinanceMortgage Payoff CalculatorSee how extra payments, lump sums, and biweekly payments change your mortgage-free date and total interest.Best for: Planning how fast you can pay off an existing mortgage.FinanceAmortization Schedule CalculatorBuild a full payment-by-payment schedule showing how each instalment splits between principal and interest.Best for: Seeing the year-by-year breakdown of any fixed loan.FinanceLoan CalculatorWork out the monthly payment, total interest, and payoff date for any fixed-rate loan from the amount, rate, and term.Best for: A quick payment estimate for any kind of loan.FinancePersonal Loan CalculatorEstimate repayments on an unsecured personal loan and see how the rate and term change what you pay overall.Best for: Comparing personal-loan offers side by side.FinanceAuto Loan CalculatorCalculate a car-loan payment from price, down payment, trade-in, rate, and term, including the total cost of financing.Best for: Budgeting the monthly cost of a vehicle.FinanceCar Affordability CalculatorFind the car price that fits your budget by working backward from a comfortable monthly payment.Best for: Setting a realistic price range before you shop.FinanceAPR CalculatorTurn a loan rate plus fees into the true annual percentage rate so you can compare offers on equal terms.Best for: Spotting the real cost behind a low headline rate.FinanceInterest Rate CalculatorFind the hidden interest rate in a loan from the amount, monthly payment, and term — for car, dealer, and personal loans, with fees and balloon support.Best for: Revealing the rate behind a “$X per month” loan offer.FinanceSimple Interest CalculatorCalculate interest charged on the principal only, plus the final balance, for short-term loans and deposits.Best for: Quick interest math without compounding.FinanceCompound Interest CalculatorSee how savings grow as interest earns interest, with adjustable contributions and compounding frequency.Best for: Understanding the long-run power of compounding.FinanceSavings CalculatorProject a savings balance — or solve how much to save for a goal — with monthly and annual deposits, APR/APY, tax, inflation, and a full schedule.Best for: Forecasting savings growth or planning a savings goal.FinanceCD / Fixed Deposit CalculatorMaturity value, interest, APY, after-tax return, early-withdrawal penalty, and a CD ladder for a certificate of deposit, fixed deposit, or term deposit.Best for: Comparing fixed-term deposit returns globally.FinanceRetirement CalculatorProject your retirement pot from current savings, contributions, and growth, and gauge whether it meets your goal.Best for: Checking if your saving rate is on track.Finance401(k) CalculatorEstimate your 401(k) balance at retirement, including employer matching and the effect of consistent contributions.Best for: Seeing how the match and time grow your balance.FinancePension CalculatorProject a pension fund’s value and the income it could provide based on contributions, growth, and years saved.Best for: Estimating future pension income.FinanceInflation CalculatorSee how rising prices change the buying power of money between two years at a given inflation rate.Best for: Comparing the real value of money over time.
Investing calculators
Project growth, returns, and income from your investments.
InvestingInvestment CalculatorThe master investment growth calculator — lump sum, regular contributions, goal planning, and mutual-fund-style investing, with fees, inflation-adjusted value, scenarios, and a downloadable Excel model.Best for: Projecting how a lump sum, monthly contributions, or mutual funds may grow.InvestingMutual Fund CalculatorEstimate how a lump sum, SIP, or both may grow in a mutual fund after expense ratio, exit load, and inflation — with fee sensitivity and a downloadable Excel model. Educational only; no fund recommendation.Best for: Mutual fund growth, expense-ratio impact, and SIP vs lump sum.InvestingRegular Investment CalculatorProject how regular monthly contributions grow over time — SIP-style investing, dollar-cost averaging, inflation-adjusted value, and long-term goals.Best for: Monthly investing, SIP, and dollar-cost averaging.InvestingRetirement Withdrawal CalculatorEstimate how long your savings may last with regular withdrawals — portfolio drawdown, safe withdrawal rate, inflation, and a year-by-year schedule. Also known as an SWP.Best for: Retirement income, portfolio drawdown, and how long your money will last.InvestingFuture Value CalculatorCalculate what a present sum, or a stream of payments, will be worth in the future at a set growth rate.Best for: Valuing money you will have later.InvestingPresent Value CalculatorFind today’s value of a future amount by discounting it back at a chosen rate — the core of the time value of money.Best for: Comparing future payouts in today’s terms.InvestingCAGR CalculatorMeasure the smoothed annual growth rate of an investment between its starting and ending value.Best for: Comparing returns across different periods.InvestingROI CalculatorCalculate return on investment as a percentage of cost, with the net gain and annualised return.Best for: Judging whether an investment paid off.InvestingRule of 72 CalculatorEstimate how many years it takes an investment to double at a given annual return — and the reverse.Best for: A fast mental check on doubling time.InvestingDividend CalculatorWork out dividend income and yield from share price, holdings, and the dividend per share.Best for: Estimating income from dividend stocks.InvestingDividend Reinvestment CalculatorProject how reinvesting dividends (DRIP) compounds your shares and income over the years.Best for: Seeing the long-run effect of reinvesting.
Tax estimators
Estimate income tax, sales tax, VAT, GST, and take-home pay.
TaxCapital Gains Tax CalculatorEstimate tax on a profit from selling an asset using your cost basis, sale price, and the rate you enter.Best for: Gauging the tax on a sale before you file.TaxIncome Tax Calculator (Manual Progressive Bands)Estimate income tax from your earnings and the progressive bands you enter, with effective and marginal rates explained.Best for: A quick income-tax estimate you can tailor.TaxManual Progressive Income Tax Band CalculatorEnter your own tax bands and see income taxed band-by-band, with the total, effective rate, and marginal rate.Best for: Modelling any country’s progressive tax bands.TaxSales Tax CalculatorAdd or remove sales tax at any rate to find the net price, the tax amount, and the gross total.Best for: Working out tax on a purchase or invoice.TaxVAT CalculatorAdd or strip VAT at your chosen rate to see the net amount, the VAT, and the gross total.Best for: Pricing goods and invoices with VAT.TaxGST CalculatorCalculate GST on a price — adding or removing it — and split it where a region uses combined components.Best for: GST-inclusive and exclusive price math.TaxSalary / Take-Home Pay CalculatorEstimate net pay after the tax and deductions you enter, from a gross salary across any pay period.Best for: Seeing what actually lands in your account.TaxHourly to Salary CalculatorConvert an hourly wage into weekly, monthly, and annual pay from the hours you work each week.Best for: Comparing hourly and salaried offers.TaxPaycheck CalculatorBreak a paycheck into gross pay, the tax and deductions you enter, and the net amount per pay period.Best for: Estimating a single paycheck’s take-home.
Budget & credit calculators
Budgets, debt payoff plans, credit cards, and net worth.
BudgetBudget CalculatorMap income against spending categories to see what is left over and where the money goes each month.Best for: Building a clear monthly spending plan.Budget50/30/20 Budget CalculatorSplit take-home pay into needs, wants, and savings using the 50/30/20 rule, with amounts for each bucket.Best for: A simple framework to start budgeting.BudgetNet Worth CalculatorAdd up assets and subtract debts to find your net worth and see what drives the total.Best for: A snapshot of overall financial health.BudgetDebt Payoff CalculatorFind how long it takes to clear a debt and the total interest, based on your balance, rate, and payment.Best for: Planning a single debt’s payoff timeline.BudgetDebt Snowball CalculatorClear debts smallest balance first to build momentum, with a payoff order and timeline across all your debts.Best for: Staying motivated by quick early wins.BudgetDebt Avalanche CalculatorTarget the highest interest rate first to minimise total interest, with the payoff order and time to debt-free.Best for: Paying the least interest overall.BudgetCredit Card Payoff CalculatorSee how long it takes to clear a card balance and the interest cost at your chosen monthly payment.Best for: Finding a payment that clears the card.BudgetCredit Card Interest CalculatorEstimate the monthly and yearly interest a card charges on a balance at a given APR.Best for: Seeing the real cost of carrying a balance.BudgetMinimum Payment CalculatorSee how long minimum-only payments take and how much interest they add compared with paying more.Best for: Understanding the minimum-payment trap.BudgetDebt-to-Income Ratio CalculatorDivide monthly debt payments by gross income to find the DTI ratio lenders use to assess borrowing.Best for: Checking how lenders see your finances.
Business & ecommerce calculators
Margins, break-even, ad returns, and unit economics.
BusinessProfit Margin CalculatorUnderstand gross, operating, and net margin from revenue, costs, fees, and expenses.Best for: Checking how much of revenue is real profit.BusinessMarkup CalculatorSet a selling price from cost and a target markup, and see the margin and profit it produces.Best for: Pricing products from cost up.BusinessBreak-Even CalculatorFind the sales volume where revenue covers fixed and variable costs — the point profit begins.Best for: Knowing how much you must sell to not lose money.BusinessEcommerce Profit CalculatorNet out product cost, fees, shipping, ads, and returns to find the real profit per order and overall.Best for: Seeing true profit after every fee.BusinessROAS CalculatorMeasure return on ad spend by dividing revenue from ads by what you spent to earn it.Best for: Judging whether a campaign pays back.BusinessBreak-Even ROAS CalculatorFind the ROAS your margins require to break even, so you know the floor a campaign must beat.Best for: Setting the ad-return target before you spend.BusinessCAC CalculatorCalculate the cost to acquire one customer from total sales and marketing spend over a period.Best for: Tracking what each new customer costs.BusinessLTV CalculatorEstimate the lifetime value of a customer from average order value, frequency, margin, and retention.Best for: Knowing how much a customer is worth to spend on.BusinessReorder Point CalculatorWork out the stock level at which to reorder, from demand, lead time, and a safety-stock buffer.Best for: Avoiding stockouts without overordering.BusinessInventory Turnover CalculatorMeasure how many times inventory sells through in a period, plus the average days each item sits in stock.Best for: Spotting slow- and fast-moving stock.
Math & statistics calculators
Percentages, averages, spread, and everyday math.
MathPercentage CalculatorSolve the everyday percentage questions — X% of a number, what percent one number is of another, and more.Best for: Fast, reliable percentage math.MathPercentage Change CalculatorFind the percentage increase or decrease between two values, with the absolute difference shown too.Best for: Comparing before-and-after figures.MathAverage CalculatorCalculate the mean of a set of numbers, along with the count and sum, from a list you enter.Best for: A quick mean of any dataset.MathMean Median Mode CalculatorFind the mean, median, mode, and range of a dataset together, with each measure explained.Best for: Summarising a dataset’s centre and spread.MathStandard Deviation CalculatorCompare sample and population standard deviation, variance, mean, range, and deviations from the mean.Best for: Measuring how spread out a dataset is.MathVariance CalculatorCalculate the variance of a dataset for both sample and population, with the mean and squared deviations.Best for: Quantifying variability in data.MathZ-Score CalculatorFind how many standard deviations a value sits from the mean, and what that implies on a normal curve.Best for: Standardising and comparing data points.MathFraction CalculatorAdd, subtract, multiply, and divide fractions, with the result simplified to its lowest terms.Best for: Working with fractions step by step.MathRatio CalculatorSimplify ratios, scale them up or down, and solve for a missing term in a proportion.Best for: Scaling recipes, mixes, and proportions.MathScientific CalculatorA full scientific calculator with powers, roots, logarithms, and trigonometric functions.Best for: Advanced calculations beyond basic arithmetic.
Date, time & health calculators
Age, dates, durations, BMI, and daily calories.
EverydayAge CalculatorCalculate exact age in years, months, and days from date of birth.Best for: Finding an exact age for any date.EverydayDate Difference CalculatorCount the days, weeks, months, and years between any two dates, including leap years.Best for: Measuring the gap between two dates.EverydayTime Duration CalculatorFind the length of time between a start and end time, in hours and minutes.Best for: Totalling hours for shifts and tasks.EverydayBMI CalculatorCalculate body mass index from height and weight, and see the category it falls into.Best for: A quick weight-status screening figure.EverydayCalorie CalculatorEstimate daily calorie needs from age, sex, height, weight, and activity level for maintaining weight.Best for: A starting point for daily calorie targets.
How to use these calculators
Treat each result as a planning estimate, then adjust the inputs to test practical scenarios.
Finance and tax results depend on rates, fees, and rules that vary by place and year — verify the figures that matter.
Health calculators are general educational estimates and do not replace medical guidance.