Calculators

Quick, free calculators and converters for home, school, DIY and everyday life. Everything runs in your browser.

• 50/30/20 budget calculatorDivide your take-home pay into needs (50%), wants (30%) and savings (20%).
• Add days to a dateFind the date a number of days or weeks before or after a start date.
• Age calculatorFind an exact age in years, months and days, and the days until the next birthday.
• Air conditioner size calculatorFind the recommended cooling capacity (kW) for your room size and climate.
• Annual investment growth calculatorSee how regular monthly investments grow with compound returns over time.
• Appliance running cost calculatorFind out how much an electric appliance costs to run per hour, day and year.
• Aspect ratio calculatorCalculate image or video dimensions maintaining 16:9, 4:3, 1:1 or custom aspect ratio.
• Average calculatorFind the mean, median, smallest, largest and range of a list of numbers.
• BMI and healthy weight calculatorCalculate body mass index (BMI) and healthy weight range for adults.
• Baking grams to cups converterConvert weight in grams to metric cups for flour, sugar, butter, oats and cocoa.
• Bra size calculator (AU / UK / US)Find your Australian bra band and cup size from underbust and bust measurements.
• Brick and paver calculatorEstimate how many standard bricks or pavers you need for a wall or patio.
• Carpet square metre calculatorEstimate broadloom carpet metres and square metres for a room, including waste.
• Concrete volume calculatorCalculate the volume of concrete for a slab, path or footing.
• Cooking volume converterConvert millilitres, litres, teaspoons, tablespoons and cups, using Australian measures.
• Daily calorie and energy deficit estimatorEstimate maintenance calories and daily target for steady weight goals.
• Daily water intake calculatorEstimate your recommended daily water intake based on body weight and activity level.
• Days between datesCount the days, weeks, months and years between two dates.
• Decking timber calculatorCalculate the lineal metres and boards required for a timber deck.
• Discount calculatorSee the sale price and how much you save, including a second discount.
• Dog and cat age in human years calculatorConvert your dog or cat's age into equivalent human years.
• Flooring calculatorEstimate flooring area and the number of packs to buy.
• Fraction to decimal and percentage converterConvert fractions to decimals and percentages.
• GST calculator (Australia)Add 10% GST to a price or take it out of a GST-inclusive price.
• Gravel and crushed rock calculatorCalculate the metric tonnes of gravel, roadbase or crushed rock needed for a driveway or path.
• Hours worked calculatorWork out hours worked from start and finish times, less a break.
• Inflation and purchasing power calculatorSee what money in the past would be worth today based on an average inflation rate.
• Lawn seed and fertiliser calculatorWork out kilograms of lawn seed or fertiliser required for your grass area.
• Length converterConvert between millimetres, centimetres, metres, kilometres, inches, feet, yards and miles.
• Loan repayment estimatorEstimate regular loan repayments from the amount, rate and term.
• Mortgage extra repayment calculatorSee how much interest and loan time you save by making extra home loan repayments.
• Oven temperature converterConvert between conventional oven, fan-forced, Celsius, Fahrenheit and Gas Marks.
• Paint calculatorEstimate how many litres of paint you need for a room.
• Percentage calculatorWork out a percentage of a number, what percent one number is of another, and percentage change.
• Random password generatorCreate a random password in your browser. Nothing is stored or sent.
• Recipe scalerScale a recipe up or down for a different number of servings.
• Ring size converterConvert ring diameter (mm) to Australian/UK letter sizes and US numbers.
• Roman numeral converterConvert standard numbers to Roman numerals and vice versa.
• Running pace and speed calculatorConvert running pace (min/km) to speed (km/h) and predict race finish times.
• Salary to hourly pay converterConvert annual salary to hourly rate, weekly pay and fortnightly pay.
• Savings goal calculatorWork out how much you need to save each week or month to reach a target.
• Simple and compound interest calculatorCompare simple and compound interest over a number of years.
• Sleep cycle calculatorWork out the best bedtimes and wake-up times based on 90-minute sleep cycles.
• Soil and mulch calculatorWork out how much soil or mulch to spread over a garden bed.
• Speed, distance and time calculatorCalculate speed, distance or travel time from any two values.
• Swimming pool volume calculatorCalculate the volume of water and litres in rectangular, oval and round pools.
• Temperature converterConvert between Celsius, Fahrenheit and Kelvin.
• Tile calculatorWork out how many tiles to buy for a floor or wall, including waste.
• Tip and split bill calculatorAdd an optional tip and split a bill between any number of people.
• Trip fuel cost calculatorEstimate the fuel needed and the cost for a trip, per person if you share.
• Wall stud calculatorEstimate how many timber studs and plates you need for a stud wall.
• Wallpaper roll calculatorEstimate how many standard rolls of wallpaper you need for a room.
• Weight converterConvert between grams, kilograms, ounces, pounds, stone and tonnes.
• Word and character counterCount words, characters, sentences and reading time as you type.