Everyday Calculators

Calculate the exact change ratio and percentage between any old and new value instantly and free – free, no sign-up

Instantly find the day of the week for any date—free, no sign-up

Calculate the exact number of days (and weeks) between any two dates instantly and free, no sign-up

Calculate how many days (and weeks) are left until Christmas instantly and free, so you can plan gifts and events without guesswork – free, no sign-up

See what you'll pay and save on any percentage discount instantly. Free, no sign-up — enter the price and % off.

Calculate instantly how many years it will take you to reach conversational fluency in a language—free and instant. free, no sign-up

Calculate your fee instantly for free – just enter an amount and a percentage to see the exact fee, free, no sign-up

Instantly calculate a percent, the amount from a percent, or percent change—free, no sign-up

Instantly get the exact percent of a number, part‑of‑whole ratio, or change percentage – free and no sign‑up

Calculate the exact percent, amount, or base value instantly and free – perfect for budgeting, discounts, and taxes. Use it free, no sign-up

Add sales tax to any price and see the tax and total instantly. Free, no sign-up — works for any tax rate.

Work out the tip and split the total per person in seconds. Free, no sign-up — enter the bill, tip % and party size.