Popular Tools

Calculate your Body Mass Index (BMI) and assess your health status based on height and weight. Ideal for personal health monitoring.

Instantly identify prime, composite, or special numbers. Supports batch checking and mathematical property analysis.

A two-way IPv4 and IPv6 address converter for network configuration, debugging, and format validation.

Estimate a metric band and cup from bust and underbust measurements in centimeters.

Calculate Body Surface Area (BSA) based on height and weight using multiple medical formulas. Ideal for medication dosage estimation and physiological research.

Calculate the exact countdown to any future date. Supports both Gregorian and Lunar calendars, displaying the remaining weeks, days, hours, minutes, and seconds.

Quickly calculate the area of a circle by entering the radius, diameter, or circumference. Supports custom units and precision settings.

Estimate bond yield to maturity using price, face value, annual coupon and years remaining.

Generate fictional Japanese-style addresses with postal codes, prefectures, municipalities, and block numbers for development and QA testing.

Two-way conversion between RGB and CIELab color spaces, providing precise color mapping for designers and developers.

Quickly calculate the least common multiple (LCM) of two or more integers. Supports space-separated number list input.

An online tool to calculate the greatest common divisor (GCD) of multiple integers. Supports space-separated number lists.

Accurately convert between numeric amounts and Chinese uppercase/lowercase financial characters to meet formatting standards for Chinese contracts, invoices, and banking.

Convert HTTP/HTTPS file URLs into dedicated download links for Thunder, FlashGet, and QQ Xuanfeng to use with various download clients.

Quickly calculate the cube root of any number with customizable decimal places for accurate and reliable results.

Generate realistic, properly formatted fake Spanish addresses for development testing and data population.

Upload Python .pyc or .pyo bytecode files and attempt to recover readable, approximate .py source code.

Generate formatted random phone numbers in bulk by country, region, carrier, or custom prefix. Deduplicate, copy, and export to TXT or CSV.

Find the ordinal day, year length and remaining days for a selected calendar date.

Customize character types and length to generate strong random passwords and secure your accounts.