Calculator collection

Everyday Calculators

Fast tools for dates, shopping, dining, and daily decisions. Every calculator is free, works instantly, and explains its formula.

Calculate age in years, months, days, and total days.

Find the number of days, weeks, and hours between two dates.

Calculate a tip, total bill, and amount per person.

Find a sale price and savings after a percentage discount.

Calculate sales tax and the final price for any local tax rate.