Calculator Tools
Quick, accurate calculators for percentages and everyday math — no ads blocking the numbers.
Unit Converter
Convert between units across six categories — length, weight, temperature, volume, area, and speed.
Time Zone Converter
Convert a date and time from one time zone to over 20 major time zones at once, correctly handling daylight saving time.
Age Calculator
Calculate exact age in years, months, and days, plus total days lived and a countdown to your next birthday.
Tip Calculator
Calculate a tip amount and total bill, with quick presets and split-between-people support.
Timestamp Converter
Convert between Unix timestamps and human-readable dates, in both directions, with multiple format outputs.
Image Aspect Ratio Calculator
Calculate image aspect ratios, find a missing width or height, and check against common preset ratios like 16:9 or 1:1.
Percentage Calculator
Calculate percentages five different ways: percentage of a number, percentage increase or decrease, what percent X is of Y, and percentage difference.