Free online calculators

Everyday math, from the checkout to the kitchen

Working out a tip at a restaurant, the sale price of a jacket, your monthly loan payment or the number of days until a deadline does not call for a spreadsheet. This family brings together calculators, converters and timers for the numbers you run into at home, at work and at school, from homework fractions to a freelance rate.

Several converters bridge US customary units and metric or European sizes, which helps when a recipe lists grams, a pair of shoes comes in EU sizes or a training plan is written in kilometers.

A few common starting points

• Percentage calculator: solves the usual percentage questions in one step.
• Tip calculator: adds the tip and splits the bill between diners.
• Loan calculator: monthly payment and amortization schedule.
• Age calculator: exact age and the number of days between two dates.
• Hours calculator: works with hours and minutes, for example to total a timesheet.
• Unit converter: switches between metric and imperial units.
• Time zone converter: finds the time in another city before you schedule a call.
• Online timer and stopwatch: count down or measure elapsed time.