Popular Tools

A tool for converting dates between the lunar and solar calendars. It supports lunar leap months and is ideal for looking up holidays, birthdays, or historical dates.

Calculate key data like fuel consumption per 100km (L/100km) and cost per kilometer based on your driving distance, fuel volume, and gas price.

Generate correctly formatted random email addresses in bulk, with customizable domains and prefix rules — ideal for testing sign-ups and protecting privacy.

Quickly estimate fetal weight using ultrasound data like Biparietal Diameter (BPD), Abdominal Circumference (AC), and Femur Length (FL). Uses the Hadlock formula to provide a reliable reference for pregnancy assessment.

Generate properly formatted fake US addresses for software testing, development, and data anonymization.

Convert between Simplified Chinese, Traditional Chinese, and Martian text (Huoxingwen) for stylized messages, profiles, and nicknames.

A pixel (PX) to point (PT) unit conversion tool for designers and developers. Supports custom PPI for typography and layout adaptation.

Calculate the minimum daily calories your body needs at rest based on gender, height, weight, and age. Get a scientific reference for your diet and fitness plans.

Calculate your body fat percentage using BMI and waist circumference formulas. Get instant body composition insights for fitness and health management.

Quickly generate random, fake Chinese addresses complete with provinces, cities, districts, streets, and postal codes. Perfect for software testing and mock data generation.

Provides controllable random color generation for designers and developers, supporting multiple formats and hue filtering.

Play Chinese chess online in local two-player or simple computer mode, with legal-move hints, undo, and restart controls.

Calculate six trigonometric functions from radian values with custom decimal precision.

Generate random browser User-Agent strings for developers, QA testers, and web scrapers to simulate various devices and platforms.

Two-way RGB and HSB/HSV color code converter supporting multiple input formats. Ideal for designers and developers.

Generate random, properly formatted German addresses for software testing, data population, and privacy protection.

Accurately calculate traditional memorial dates including the First Seven, Third Seven, Fifth Seven, and Seventh Seven. Supports both Lunar and Gregorian calendar inputs to help families follow traditional mourning customs.

Free online Caesar cipher encryption and decryption tool. Supports custom alphabets and shift offsets. Ideal for cryptography learning and fun.

Calculate the Future Value Interest Factor of an Annuity (FVIFA) instantly. Enter your interest rate and periods to estimate the future value of regular investments with this free online calculator.

Generate random integers or decimals within a specified range, featuring duplicate removal, sorting, and formatted output.