Math

Batch Latitude & Longitude Converter

Batch convert coordinates between WGS84, GCJ02, and BD09 online. Supports text paste and Excel upload with easy data export.

Pants Size Chart

Compare Chinese, European, waist measurements in centimeters and inches, and more to quickly find your pants size.

Vertical Text Converter

Convert horizontal text into traditional vertical layout, great for calligraphy, classical Chinese, and poster design.

Current Unit Converter

Quickly and accurately convert current units like amps and milliamps.

System of Linear Equations Calculator

Enter two linear equations to instantly solve for x and y. Free online calculator with step-by-step solutions.

Water Density Calculator

Calculate water density instantly by entering temperature and salinity. Get accurate results in kg/m³ or g/cm³.

Cube Calculator

Calculate the 3rd power (cube) of any real number online. Ideal for math learning and engineering calculations.

Audio Editor

Trim, join, and adjust audio right in your browser—no software installation required. Import and export popular audio formats with ease.

Pythagorean Theorem Calculator

Enter any two sides of a right triangle to instantly calculate the length of the third side.

Wall Tile Calculator

Enter your wall dimensions and tile size to quickly calculate how many wall tiles you need, including grout joints and waste allowance—so you don’t overbuy or run short.

Prime Factorization Calculator

Enter any positive integer to instantly calculate its prime factorization. Get prime number verification and detailed step-by-step results with this free online calculator.

Scientific Notation Converter

Fast and free online scientific notation converter. Easily convert between scientific notation and standard numbers with customizable precision and significant figures.

Modulo Calculator

Calculate the remainder of two numbers after division. A free online modulo calculator supporting both positive and negative integer modulo operations.

Resistor, Capacitor & Inductor Unit Converter

Online unit conversion tool for resistors, capacitors, and inductors.

Addition Table Up to 10

Provides an addition table up to 10 in image format, available for printable download.

Shoe Size Conversion Chart

Enter your foot length in centimeters to instantly find matching China, EU, US, and UK shoe sizes—so you can shop international footwear with confidence.

Cone Calculator

Free online cone calculator to quickly find the volume, surface area, lateral surface area, and base area of a cone.

Parabola Equation Solver

Input three point coordinates to quickly find the parabola's standard form, vertex coordinates, and axis of symmetry.

Continued Fraction Calculator

Free online continued fraction calculator. Expand any real number or fraction into a continued fraction, or convert a sequence back into a rational number. Instantly calculate convergents and best rational approximations.

Rectangular Prism (Cuboid) Calculator

Enter length, width, and height to instantly calculate the base area, lateral surface area, total surface area, volume, and total edge length of a rectangular prism.