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Browse all → Math
Percentage Calculator
Find X% of Y, what percent X is of Y, or percentage change.
Date & Time
Age Calculator
Calculate your exact age in years, months, and days.
Converters
Celsius ↔ Fahrenheit
Convert between Celsius and Fahrenheit instantly.
Converters
MM ↔ Inches
Convert millimeters to inches and back.
Converters
KG ↔ LBS
Convert kilograms to pounds and back.
Date & Time
Military Time Converter
Convert between military time and standard 12-hour time.
Developer Tools
JSON Formatter
Format, beautify, and validate JSON instantly.
Developer Tools
UUID Generator
Generate random UUID v4 values — single or bulk.
Developer Tools
Base64 Encode / Decode
Encode text to Base64 or decode Base64 to plain text.
Developer Tools
Color Picker
Pick a color and convert between HEX, RGB, and HSL.