✨ Features
🔒 100% Free & Private
No ads, no signup, no watermark. Everything runs locally in your browser. Your data never leaves your device.
📏 Unit Conversion
16 unit types including length, area, volume, temperature, speed
💰 Interest Calculation
Supports deposit rate, loan rate, compound interest
🌐 Subnet Mask
IP address and subnet calculation, essential for network planning
🔢 Scientific Calculator
Supports basic operations, trig functions, logarithms, powers
💰 Interest Calculator
Calculate monthly payment, total interest, supports equal payment and equal principal
🌐 Subnet Calculator
Calculate network address, broadcast address, usable hosts
📏 Length Converter
Convert meters, cm, inches, feet, miles, nautical miles
⬛ Area Converter
Convert sq meters, hectares, acres, sq feet
📦 Volume Converter
Convert liters, milliliters, cubic meters, gallons
🌡️ Temperature Converter
Convert Celsius, Fahrenheit, Kelvin
⏱️ Time Converter
Convert seconds, minutes, hours, days, weeks, months, years
🚀 Speed Converter
Convert m/s, km/h, mph, knots, Mach
💾 Data Size Converter
Convert bytes, KB, MB, GB, TB, PB
🎈 Pressure Converter
Convert Pascal, Bar, atm, PSI
⚡ Power Converter
Convert Watts, Kilowatts, Horsepower, BTU/h
🔥 Energy Converter
Convert Joules, Calories, kcal, kWh, BTU
📐 Angle Converter
Convert degrees, radians, gradians, turns
🧊 Density Converter
Convert kg/m3, g/cm3, lb/ft3
💪 Force Converter
Convert Newton, kN, dyne, lbf, kgf
FAQ
Supports sin, cos, tan, log, ln, factorial, power, square root and more. Keyboard input supported: Enter to calculate, Escape to clear.
Supports 16 types: length, area, volume, temperature, time, speed, pressure, power, energy, angle, data size, density, force. Each includes multiple common units.
Enter IP address and subnet mask or CIDR (e.g., /24). The tool calculates network address, broadcast address, host range, host count, wildcard mask, and binary IP.
Enter principal, rate and term, select repayment method. The tool calculates monthly payment, total payment, and total interest. Equal principal also shows first/last month payment and monthly decrease.
Uses JavaScript floating-point arithmetic with precision of about 15-17 significant digits. Unit conversion results automatically remove trailing zeros.
Yes, this tool is 100% free with no ads, no signup, no usage limits, and no watermarks. All processing happens in your browser — your data never leaves your device. It's completely safe and private.