New Tools

Water Density Calculator

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

Pythagorean Theorem Calculator

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

Interest Rate Converter

Quickly convert between annual interest rates, monthly interest rates, and daily interest rates. Supports both simple interest and effective annual rate modes.

Interest Rate Calculator (2026)

Enter your principal, annual interest rate, and term to quickly calculate total interest and total balance using simple or compound interest.

TV Mount Height Calculator

Calculate the recommended TV installation height based on screen size, viewing distance, and seated eye level for comfortable viewing.

TV Size and Viewing Distance Calculator

Quickly calculate the recommended TV size range based on your viewing distance and resolution.

TV Size Calculator

Input TV diagonal inches, instantly calculate screen width, height, area and recommended viewing distance.

XPath Online Tester

Test XPath expressions right in your browser and see matches instantly — great for web scraping, data collection, and front-end debugging.

Email Icon Generator

Enter an email address to generate a custom email icon in one click, great for personal branding and websites.

Cylinder Calculator

Free online cylinder calculator. Enter the radius and height to quickly find the base area, lateral area, total surface area, and volume of any cylinder.

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.

Online TOML to JSON Converter

Free online TOML to JSON converter. Easily convert TOML configuration files into JSON format for seamless cross-platform deployment and API integration.

JSON to SQL Converter

Free online tool to quickly convert JSON data into SQL INSERT statements. Supports both array and object formats.

PPI Calculator

Input display resolution and diagonal size to instantly calculate PPI, total pixels, and dot pitch.

Child Vaccination Schedule

Generate a personalized 0-6 year child vaccination schedule by birth date. Easily track your baby's immunization plan and never miss a shot.

Code to Image Tool

Generate beautiful code screenshots with one click, supporting multi-language syntax highlighting and customizable themes.

Root Mean Square (RMS) Calculator

Quickly calculate the Root Mean Square (RMS) of a dataset online. Perfect for signal analysis, AC effective values, and engineering calculations.

Gross Margin Calculator

Input revenue and costs to instantly calculate gross profit margin, gross profit amount, and cost ratio, helping you determine if your product and business are profitable.

QQ Direct Chat Tool

Enter a QQ number to instantly generate a link that opens a direct chat window without adding them as a friend.

Fraction Calculator

Free online fraction calculator to quickly add, subtract, multiply, and divide fractions. Easily simplify fractions and convert mixed numbers.