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Check if your password appeared in a data breach. Your password never leaves your browser.
Calculate your monthly mortgage payment, total interest, and how much extra payments save you.
What is X% of Y? X is what percent of Y? Percent increase and decrease — answered instantly.
How many days between two dates? What date is 90 days from now? Answered instantly.
Convert millimeters, centimeters, meters, kilometers, inches, feet, yards and miles instantly.
Convert Celsius, Fahrenheit and Kelvin instantly, with common reference points.
Convert bytes, kilobytes, megabytes, gigabytes and terabytes. Explains KB vs KiB.
What score do you need on your final exam to get an A? Enter your grade, the final weight and your target.
What time should you go to bed? Wake up at the end of a 90-minute sleep cycle and skip the grogginess.
What time is it in London when it is 3pm in New York? Convert any time across time zones, DST handled.
Most calculator sites are slow, covered in ads, and look like 2005. CalcHub is a single fast page per calculator: type your numbers, get the answer instantly. Everything runs in your browser — nothing is uploaded or tracked. New calculators are added every week, so if the one you need is missing, check back soon.