Calculators

Find percentages, percentage change or difference, and increase or decrease a value by a percentage.

Find the monthly payment, total interest and full amortization schedule for a fixed-rate loan.

Work out an exact age in years, months and days from a birth date, plus the countdown to the next birthday.

Work out the tip on a bill and split the total evenly across any number of people.

Count down the days, weeks and months until any future date.

Estimate wall paint in gallons or liters, or wallpaper rolls with repeat and trimming allowances.

Work out a sale price from an original price and a discount percentage, or the percentage off between two prices.

Work out Body Mass Index from height and weight, in metric or imperial, with the standard adult category.

Dog age calculator: convert a dog or cat's age into human years, with dog aging rate adjusted for adult size.

Add, subtract, multiply and divide fractions and mixed numbers, then see the answer in lowest terms with the steps.

Find the greatest common factor of two or more whole numbers, with exact answers and worked steps.

Find the mean, median, mode, range, quartiles and standard deviation of a list of numbers, with the working shown.

Add a tax percentage to a net price, or back it out of a gross price to find the net and tax.

Project the future value of a balance with regular contributions, any compounding frequency, and a year-by-year breakdown.

Compare four approximate bedtime or wake-time options using assumed 90-minute sleep cycles.