Free websiteWebsite

Calculators

Quick, accurate calculators for everyday numbers — percentages, discounts, GST and VAT, loans and mortgages, interest, pay and more. Every calculator runs in your browser, shows how the answer was worked out, and explains the formula behind it.

44 tools

Mortgage CalculatorCalculate your home loan repayments, total interest and how much extra repayments could save you.
Percentage CalculatorWork out X% of a number, what percentage one number is of another, percentage change, percentage difference and reverse percentages.
Age CalculatorCalculate exact age in years, months and days from a date of birth — plus total days, weeks and your next birthday.
GST / VAT CalculatorAdd or remove VAT, GST or sales tax at any rate — with the standard rate for 70 countries built in and your country selected automatically.
Income Tax CalculatorEstimate income tax and take-home pay for Australia, the UK, the US and New Zealand using current rates.
Compound Interest CalculatorSee how savings grow with compound interest and regular contributions, with a year-by-year table.
Loan CalculatorCalculate repayments, total interest and the full cost of a personal loan, including fees.
Days Between Dates CalculatorCount the days, weeks, months and years between two dates, with weekdays and an option to include the end date.
Percentage Increase CalculatorAdd a percentage to a number, or find the percentage increase between two values.
Salary CalculatorConvert pay between annual, monthly, fortnightly, weekly, daily and hourly amounts.
Mortgage Affordability CalculatorEstimate how much you could borrow for a home based on your income, expenses, debts and deposit.
BMI CalculatorCalculate body mass index in metric or imperial units and see the healthy weight range for your height.
Pregnancy Due Date CalculatorEstimate your baby’s due date from your last period, conception date or IVF transfer — with how many weeks pregnant you are.
Discount CalculatorFind the sale price and how much you save, including stacked discounts like “extra 10% off”.
Profit Margin CalculatorCalculate gross margin, markup and profit from cost and price — or find the price for a target margin.
GPA CalculatorCalculate your grade point average from your grades and credits, on the US 4.0 scale or the Australian 7-point scale.
Percentage Decrease CalculatorTake a percentage off a number, or find the percentage decrease between two values.
Sleep CalculatorFind the best time to go to bed or wake up, in 90-minute sleep cycles, so you wake between cycles rather than in deep sleep.
Stamp Duty CalculatorEstimate property stamp duty / transfer duty for NSW, Victoria, Queensland and England (SDLT).
Investment CalculatorProject how an investment grows with monthly contributions, rising contributions and inflation.
Tip CalculatorWork out the tip and split the bill between any number of people.
Car Loan CalculatorCalculate car finance repayments with deposit, trade-in, fees and an optional balloon payment.
ROI CalculatorCalculate return on investment and annualised return (CAGR) for any investment.
Zakat CalculatorWork out the zakat due on your savings, gold, silver, investments and business stock, with the gold or silver nisab.
Retirement CalculatorProject your retirement savings and the yearly income they could provide, in today’s money.
Fraction CalculatorAdd, subtract, multiply and divide fractions, with the answer simplified and shown as a mixed number and decimal.
Savings Goal CalculatorFind how long it takes to reach a savings goal, or how much to save each month to get there.
Amortization CalculatorGenerate a full loan amortization schedule showing interest, principal and balance for every repayment.
Hourly Wage CalculatorTurn an hourly rate into weekly, fortnightly, monthly and annual earnings.
IELTS Band Score CalculatorWork out your IELTS overall band from Listening and Reading correct answers (out of 40) and your Writing and Speaking bands — Academic or General Training.
Average CalculatorFind the average (mean) of a list of numbers, plus the sum, count and median.
Crypto Profit CalculatorWork out the value, profit or loss and percentage return on a crypto holding from what you paid and the current price.
Markup CalculatorApply a markup percentage to a cost to get the selling price, profit and equivalent margin.
Gold & Silver Value CalculatorWork out what gold or silver is worth from its weight, karat or fineness and today’s price — in any currency.
Mean, Median & Mode CalculatorCalculate the mean, median, mode, range, variance and standard deviation of a data set.
Time CalculatorAdd and subtract hours, minutes and seconds, and convert the total to decimal hours.
Overtime CalculatorCalculate overtime pay at time-and-a-half, double time or any multiplier.
Ratio CalculatorSolve missing values in a ratio (A:B = C:?) or simplify a ratio to its lowest terms.
Rent vs Buy CalculatorCompare the long-term financial outcome of buying a home versus renting and investing the difference.
Inflation CalculatorSee how inflation raises future prices and erodes the buying power of money.
Simple Interest CalculatorCalculate simple interest on a principal for any rate and period in years, months or days.
Tarneeb Score CalculatorKeep score in Tarneeb: enter each hand’s bid and tricks and the sheet adds up both teams, including Kaboot and bids of 13.
Trix Score CalculatorKeep score in Trix (Trex): King of Hearts, Queens, Diamonds, Ltoush and Trix for four kingdoms, with doubling and checks that the counts add up.
Hand Card Game Score CalculatorKeep score in Hand (Hand Saudi): enter who went out and the points left in everyone’s hand; lowest total wins. 2–6 players.

Guides & articles