New Tools

Absolute Value Calculator

Enter a real or complex number to instantly calculate its absolute value (modulus).

Mass Flow Rate Calculator

Free online mass flow rate calculator. Enter density and volumetric flow rate to quickly calculate mass flow rate with automatic unit conversions.

Greek Alphabet Reference

Quickly query 24 Greek letters with uppercase, lowercase, pronunciation, and common usage scenarios.

Batch Coordinate to Address Converter

Batch reverse geocode latitude and longitude coordinates into detailed addresses. Supports Excel upload and export, processing up to 500 records per batch.

Batch Geocoding (Address to Coordinates)

Convert batch addresses to latitude/longitude coordinates; supports text paste and Excel upload/export; up to 500 entries per batch.

Batch Latitude & Longitude Converter

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

Online Piano Keyboard

Play our free online virtual piano keyboard. Features selectable instrument tones, quick chord lookup, and MIDI/MP3 recording.

Room Measurement Calculator

Input room dimensions and doors/windows room by room, automatically calculate area and estimate tile, paint, and other material quantities

Bazi Name Generator

Generate 20-50 auspicious baby names based on your Bazi (Four Pillars of Destiny) and Five Elements. Includes complete Three Realms and Five Grids analysis.

IRR (Internal Rate of Return) Calculator

Calculate internal rate of return (IRR) and payback period to assess project returns and break-even timeline.

NPV (Net Present Value) Calculator

Calculate Net Present Value (NPV) and determine project investment value.

Annuity Present Value Calculator

Quickly calculate the present value and future value of ordinary annuities, annuities due, and perpetuities, with synchronized output of annuity present value factors and future value factors to support pension, loan, and investment analysis.

Break-even ROI Calculator

Enter profit margin, return rate, and other cost proportions to quickly calculate break-even ROI and ROAS for ad spending, with sensitivity analysis included—see the safety threshold at a glance.

E-commerce ROI Calculator

E-commerce advertising ROI/ROAS profit and loss calculator that accounts for profit margins, return rates, and hidden costs to quickly assess whether your ad spending is profitable

Noise Meter Pro

Professional Noise Detector: A/C/Z Weighting, Spectrum Analysis, Data Export

Essay Paper Generator

Customize and generate blank A4 essay paper PDFs online. Features custom word count markers and headers for printable writing and manuscript paper.

JPG to ICO Converter

Free online JPG to ICO converter. Easily convert JPG images into multi-size ICO files containing up to 6 different dimensions for favicons and desktop icons.

PNG to ICO Converter

Free online PNG to ICO converter. Instantly convert PNG images to ICO icon files with 6 standard sizes automatically bundled for favicons and Windows icons.

JPG & AVIF Converter

Free online tool to convert between JPG and AVIF formats. Optimize image file sizes with secure, fast, in-browser processing.

PNG & AVIF Converter

Free online converter for bidirectional PNG and AVIF format conversion. Significantly reduce image file sizes while maintaining high quality.