7 CALCULATORS
← All toolsEveryday calculators
Quick answers to the questions that come up every day: what a percentage of a number is, how much a value changed, what a discount really saves, how to split a bill, how old someone is and how many days lie between two dates.
Each calculator shows the formula it uses and a worked example, so you can check the answer by hand and reuse the method elsewhere.
Core mathsPercentage of a number Find any percentage of a number, and see the remaining amount after subtracting it.Growth & changePercentage change Find the increase or decrease between two values, relative to the starting amount.ShoppingDiscount calculator Estimate the final price after a discount, including optional sales tax on the discounted price.Group spendingTip & bill split Work out the tip, total bill and amount each person owes.DatesAge calculator Calculate completed years alive, the approximate number of days lived and days until the next birthday.DatesDays between dates Measure the number of calendar days between any two dates.DatesLife in weeks See how many weeks you have lived and how many may remain under a lifespan you choose.