Free Unit Converters Online
Whether you\'re following a recipe in Fahrenheit, checking a marathon pace in min/km, or sizing cloud storage in gigabytes, quick unit conversion saves real mistakes. NToolHub\'s converters cover everyday units and technical ones alike — each with a full conversion table so you see every equivalent at a glance, not just one answer.
Angle Converter
Convert degrees to radians, radians to degrees, gradians, turns and more with NToolHub’s free angle converter. Instant, no sign-up needed.
Open tool →Area Converter
Convert acres to square feet, hectares to acres, m² to ft² and more with NToolHub’s free area converter. Instant results, no sign-up needed.
Open tool →Binary Octal HEX Converter
Convert binary to hexadecimal, octal to binary and more with NToolHub’s free base converter. Exact big-integer math, bit and byte counts, no sign-up.
Open tool →Data Storage Converter
Convert GB to MB, bytes to bits, TB to GB and more with NToolHub’s free data storage converter. True binary 1024-based units, instant results, no sign-up.
Open tool →Data Transfer Converter
Convert Mbps to MB/s, Gbps to Mbps, Kbps to KB/s with NToolHub’s free data transfer rate converter. Compare ISP speeds accurately. Instant, no sign-up.
Open tool →Decimal Fraction Converter
Convert decimals to simplified fractions with NToolHub’s free converter. Choose max denominator, see nearest fractions, no sign-up needed.
Open tool →Density Converter
Convert g/cm³ to kg/m³, lb/ft³ to kg/m³, oz/gal and more with NToolHub’s free density converter. Precise constants, instant results, no sign-up.
Open tool →Energy Converter
Convert kWh to joules, calories to joules, BTU to kWh and more with NToolHub’s free energy converter. Instant results, no sign-up needed.
Open tool →Force Converter
Convert newtons to pound-force, kilogram-force to newtons, dynes and more with NToolHub’s free force converter. Exact constants, instant results, no sign-up.
Open tool →Fraction Decimal Converter
Convert fractions to decimals, percentages and mixed numbers with NToolHub’s free converter. Simplifies fractions too, no sign-up needed.
Open tool →Frequency Converter
Convert MHz to GHz, RPM to hertz, kHz to MHz and more with NToolHub’s free frequency converter. Great for audio, radio and engineering. No sign-up.
Open tool →Fuel Economy Converter
Convert MPG to L/100km, L/100km to MPG, km/L and more with NToolHub’s free fuel economy converter. Compare cars worldwide. Instant, no sign-up.
Open tool →Length Converter
Convert kilometers to miles, meters to feet, inches to centimeters and more with NToolHub’s free length converter. Instant, accurate, no sign-up.
Open tool →Mass Converter
Convert kilograms, grams, milligrams, pounds, slugs and atomic mass units with NToolHub’s free mass converter. Precise, fast, no sign-up.
Open tool →Number System Converter
Convert binary, octal, decimal and hexadecimal numbers with NToolHub’s free number system converter. Big integers supported, no sign-up.
Open tool →Pace Converter
Convert min/km to min/mile, running pace to km/h and mph with NToolHub’s free pace converter. Smart m:ss input for runners. No sign-up needed.
Open tool →Power Converter
Convert horsepower to watts, kilowatts to BTU/h, megawatts to hp with NToolHub’s free power converter. Instant results, no sign-up needed.
Open tool →Pressure Converter
Convert bar to PSI, atmospheres to kPa, mmHg to Pa and more with NToolHub’s free pressure converter. Instant results, no sign-up needed.
Open tool →Roman Numeral Converter
Convert numbers to Roman numerals and Roman numerals to numbers (1–3999) with NToolHub’s free converter. Auto direction detection, no sign-up.
Open tool →Speed Converter
Convert km/h to mph, meters per second to knots, Mach to km/h with NToolHub’s free speed converter. Instant, accurate, no sign-up needed.
Open tool →Temperature Converter
Convert Celsius, Fahrenheit and Kelvin instantly with NToolHub’s free temperature converter. Exact formulas, live results, no sign-up needed.
Open tool →Time Converter
Convert hours to minutes, days to seconds, weeks to months and more with NToolHub’s free time converter. Instant results, no sign-up needed.
Open tool →Timezone Converter
Convert time between world time zones with NToolHub’s free time zone converter. DST-aware, 24 major zones, UTC offsets shown. No sign-up.
Open tool →Volume Converter
Convert liters to gallons, milliliters to cups, fluid ounces to liters with NToolHub’s free volume converter. US and imperial units, no sign-up.
Open tool →Weight Converter
Convert kilograms to pounds, ounces to grams, stones to kg and more with NToolHub’s free weight converter. Fast, accurate, no sign-up needed.
Open tool →About Our Unit Converters
All converters below compute instantly as you type, show results across every unit in the category, and work offline once loaded.