Unit Converters
11 free calculators
Length, weight, temperature, speed, energy, and data converters.
Length Converter
Convert length between meters, feet, inches, miles, km, cm, mm, yards, and nautical miles. Instant length unit converter.
Weight Converter
Convert weight between kilograms, pounds, ounces, stones, grams, and tonnes. Metric to imperial weight converter.
Temperature Converter
Convert temperature between Celsius, Fahrenheit, Kelvin, and Rankine. Instant temperature unit converter with formulas.
Speed Converter
Convert speed between mph, km/h, m/s, ft/s, and knots. Instant speed unit conversion for driving, aviation, and physics.
Area Converter
Convert area between square feet, square meters, acres, hectares, square kilometers, and square miles.
Volume Converter
Convert volume between liters, gallons, cups, pints, quarts, fluid ounces, milliliters, and cubic meters.
Pressure Converter
Convert pressure between PSI, bar, Pascal, kPa, MPa, atm, mmHg, and torr. Pressure unit converter for engineering and science.
Energy Converter
Convert energy between joules, kilowatt-hours, calories, BTU, electron volts, and foot-pounds. Energy unit converter.
Data Storage Converter
Convert data storage between bits, bytes, kilobytes, megabytes, gigabytes, terabytes, and petabytes. Binary and decimal conversions.
Number Base Converter
Convert numbers between binary (base 2), octal (base 8), decimal (base 10), and hexadecimal (base 16). Free number system converter.
Frequency Converter
Convert frequency between hertz, kilohertz, megahertz, gigahertz, RPM, and rad/s. Frequency unit converter for electronics and physics.
About Our Unit Converters
CalcProTool's unit converters are designed for users in the USA, UK, Canada, Australia, and Europe. Every calculator uses verified formulas, updates in real time, and requires no registration. All 11 tools in this category are completely free.
Each calculator page includes a full explanation of the formula used, step-by-step guidance, and answers to frequently asked questions. Our tools are designed to help you make informed decisions with confidence.