Everyday utilities
Work out a date, convert a measurement, or prepare a color or QR code for a project.
Tools 14
Search all toolsDays until calculator
Count calendar days until a date, with weeks and month breakdowns.
Weeks until calculator
Find complete weeks and remaining days before a target date.
Months until calculator
Count whole calendar months and leftover days without 30-day estimates.
Business days calculator
Count working days with custom weekends and excluded dates.
Age calculator
Calculate age in years, months and days on a chosen date.
Week number calculator
Find the ISO week number, week year and Monday–Sunday date range.
Percentage calculator
Calculate percentages, increases, decreases and relative differences.
File size converter
Convert decimal and binary storage units without rounding large integers.
Timestamp converter
Move between Unix timestamps and explicit timezones.
Color studio
Convert HEX, RGB, and HSL. Build a simple palette.
Contrast checker
Check color pairs against WCAG text thresholds.
QR code generator
Create QR codes for text, links, Wi-Fi, and email.
Unit converter
Convert length, mass, temperature, data, and more.
Date calculator
Count days between dates, or add and subtract time.
Dates and timezones
The timestamp converter works with instants and explicit offsets. The date calculator works with calendar dates. Pick the one that matches your question before calculating.
Check the real output
Scan a generated QR code on a phone before printing it. For colors, test contrast against the actual background and account for text size, weight, and transparency.