About ZVCal

ZVCal brings together the calculators and small tools people need every day — from random number picks and date math to Korean take-home pay. Everything works right in your browser, with no sign-up and nothing to install.

Every tool runs entirely on your device. Nothing you type is sent to a server, so there is nothing to worry about privacy-wise, and pages stay light and fast.

ZVCal is available in English, Korean, Japanese, Chinese, and Spanish. If you have suggestions or a tool you would like to see added, we would love to hear from you.