Math

Accurately convert between 20+ weight and mass units including kilograms, pounds, ounces, and carats. Perfect for cooking, logistics, and scientific research.

Accurately calculate the area of an ellipse by entering the semi-major and semi-minor axes. Supports customizable units and decimal precision.

Convert length units like kilometers, meters, inches, and feet online. Supports metric, imperial, and traditional Chinese units with copyable results.

Calculate the antilogarithm of any value using base e, 2, or 10. Instantly restore the original number

An accurate area conversion tool for square meters, hectares, acres, square feet, mu, and more.

Online force unit converter for Newtons, kgf, lbf, and more. Ideal for engineering calculations and physics studies.

Supports high-precision conversion of dozens of volume units including cubic meters, liters, and gallons. Ideal for engineering, chemistry, and logistics.

Accurately convert between 8 angle units including degrees, radians, minutes, seconds, and gradians. Ideal for engineering, math, and surveying.

Accurately convert data storage units from bits and bytes to exabytes (EB) with customizable decimal precision.

Quickly calculate the area of a parallelogram by entering the base and height. Supports custom units and precision settings. Ideal for geometry learning and teaching.

Enter the side length or height to instantly calculate the area of an equilateral triangle. Highly accurate results, perfect for students, teachers, and designers.

Quickly and accurately convert between over 10 energy units including joules, calories, and kWh.

Accurately convert between years, weeks, days, hours, minutes, seconds, milliseconds, microseconds, and nanoseconds with custom decimal precision.

A precise density unit converter for engineering, research, and education. Easily convert between various mass and volume units.

Generate random numbers with a specific margin of error. Ideal for testing, simulation, and data analysis.

Accurately convert between speed units like mph, km/h, m/s, Mach, and the speed of light. Ideal for research, engineering, and daily calculations.

Accurately convert between watts, kilowatts, horsepower, and other power units. Ideal for engineering, physics, and everyday calculations.

Calculate speedometer error and ride height changes after upgrading your tires.

Enter principal, annual yield rate, and days to quickly calculate expected returns for Alipay Yuebao

Free online voltage divider calculator. Quickly calculate output voltage from input voltage and two resistor values. Ideal for electronics DIY, repairs, and education.