Unit Conversions
Translate measurements instantly across metric and imperial systems. Our converters support length, weight, and temperature, utilizing exact scientific constants (such as 1 inch = 2.54 cm and 1 kg = 2.20462 lbs) to ensure precision for cooking, shipping, science, and engineering.
Featured & Popular Calculators
Browse 62 tools or search by unit and conversion direction
Universal Unit Converter
Convert length, area, volume, temperature, mass, and time with source-backed definitions.
Length Converter
Convert millimeters, centimeters, meters, kilometers, inches, feet, yards, and miles.
Temperature Converter
Convert Celsius, Fahrenheit, kelvin, and Rankine with absolute-zero validation.
Weight and Mass Converter
Convert kilograms, pounds, grams, ounces, and milligrams using exact definitions.
Volume Converter
Convert metric, cubic, US liquid, US customary, and Imperial volume units with explicit variants.
Volume — Dry Converter
Convert explicitly labeled US dry pints, quarts, gallons, pecks, and bushels using NIST definitions.
Fuel Consumption Converter
Convert L/100 km, km/L, US mpg, and Imperial mpg with explicit reciprocal and infinity handling.
Fuel Efficiency — Mass Converter
Convert specific energy and reciprocal mass-per-energy units with explicit calorie and Btu variants.
Fuel Efficiency — Volume Converter
Convert volumetric energy density and reciprocal volume-per-energy units with explicit US-liquid and Imperial gallons.
Digital Image Resolution Converter
Convert physical pixel density and reciprocal pixel pitch without conflating printer DPI or CSS resolution.
Frequency–Wavelength Converter
Convert frequency and wavelength using an explicit vacuum or custom propagation speed.
Typography Converter
Convert CSS pixels, PostScript points, picas, physical lengths, and raster pixels with explicit PPI.
Volume — Lumber Converter
Convert nominal board-foot tally, MBF, and geometric volume while keeping log-scale estimates separate.
Velocity — Angular Converter
Convert rpm, revolutions, radians, and degrees per unit time while preserving signed rotational direction.
Acceleration Converter
Convert SI, customary, Gal, speed-change, and conventional standard-gravity acceleration units.
Area Converter
Convert acres, hectares, square feet, square meters, and other squared units.
Time Converter
Convert nanoseconds, microseconds, milliseconds, seconds, minutes, hours, days, and weeks.
Speed Converter
Convert mph, km/h, knots, meters per second, feet per second, and other speed units.
Angle Converter
Convert degrees, radians, arcminutes, arcseconds, gradians, milliradians, and turns.
Pressure Converter
Convert pascals, bar, PSI, atmospheres, torr, and common metric pressure units.
Energy Converter
Convert joules, watt-hours, named calorie and Btu variants, electronvolts, and foot-pound force.
Power Converter
Convert watts, kilowatts, explicitly named horsepower variants, Btu per hour, and mechanical power units.
Force Converter
Convert newtons, dynes, kilogram-force, pound-force, kips, poundals, and named ton-force variants.
Data Storage Converter
Convert bits, bytes, decimal kB–EB, and binary KiB–EiB without mixing decimal and binary prefixes.
Prefixes Converter
Convert all current SI decimal prefixes from quecto to quetta and explicitly labeled IEC binary prefixes from kibi to qubi.
Data Transfer Converter
Convert bit and byte rates across explicit decimal and IEC binary prefixes.
Case Converter
Transform text into sentence, title, upper, lower, camel, Pascal, snake, or kebab case.
Numbers Converter
Convert exact integers among binary, octal, decimal, and hexadecimal notation.
Acres to Square Feet Converter
Convert acres to square feet using the exact international-foot and acre definitions.
Celsius to Fahrenheit Converter
Convert celsius to fahrenheit with the correct scale, offset, and absolute-zero validation.
Centimeters to Feet Converter
Convert centimeters to feet using exact international length definitions.
Centimeters to Inches Converter
Convert centimeters to inches using exact international length definitions.
Degrees to Radians Converter
Convert degrees to radians with the exact π relationship between degrees and radians.
Fahrenheit to Celsius Converter
Convert fahrenheit to celsius with the correct scale, offset, and absolute-zero validation.
Feet to Centimeters Converter
Convert feet to centimeters using exact international length definitions.
Feet to Inches Converter
Convert feet to inches using exact international length definitions.
Feet to Meters Converter
Convert feet to meters using exact international length definitions.
Grams to Ounces Converter
Convert grams to ounces using the exact international avoirdupois-pound definition.
Horsepower to Kilowatts Converter
Convert horsepower to kilowatts using the explicitly named mechanical horsepower definition of 550 ft·lbf/s.
Inches to Centimeters Converter
Convert inches to centimeters using exact international length definitions.
Inches to Feet Converter
Convert inches to feet using exact international length definitions.
Inches to Millimeters Converter
Convert inches to millimeters using exact international length definitions.
Kilograms to Pounds Converter
Convert kilograms to pounds using the exact international avoirdupois-pound definition.
Kilometers to Miles Converter
Convert kilometers to miles using exact international length definitions.
Kilowatts to Horsepower Converter
Convert kilowatts to horsepower using the explicitly named mechanical horsepower definition of 550 ft·lbf/s.
KPH to MPH Converter
Convert kph to mph using exact international mile and SI definitions.
Liters to US Liquid Gallons Converter
Convert liters to us liquid gallons with the US customary volume variant stated explicitly.
Meters to Feet Converter
Convert meters to feet using exact international length definitions.
Meters to Yards Converter
Convert meters to yards using exact international length definitions.
Miles to Kilometers Converter
Convert miles to kilometers using exact international length definitions.
Milliliters to US Customary Cups Converter
Convert milliliters to us customary cups with the US customary volume variant stated explicitly.
Millimeters to Inches Converter
Convert millimeters to inches using exact international length definitions.
MPH to KPH Converter
Convert mph to kph using exact international mile and SI definitions.
Ounces to Grams Converter
Convert ounces to grams using the exact international avoirdupois-pound definition.
Ounces to Pounds Converter
Convert ounces to pounds using the exact international avoirdupois-pound definition.
Pounds to Kilograms Converter
Convert pounds to kilograms using the exact international avoirdupois-pound definition.
Pounds to Ounces Converter
Convert pounds to ounces using the exact international avoirdupois-pound definition.
Radians to Degrees Converter
Convert radians to degrees with the exact π relationship between degrees and radians.
Square Feet to Acres Converter
Convert square feet to acres using the exact international-foot and acre definitions.
US Customary Cups to Milliliters Converter
Convert us customary cups to milliliters with the US customary volume variant stated explicitly.
US Liquid Gallons to Liters Converter
Convert us liquid gallons to liters with the US customary volume variant stated explicitly.
Yards to Meters Converter
Convert yards to meters using exact international length definitions.
Unit Conversions Educational Learning Paths
Read our deep-dives and step-by-step arithmetic explanations structured sequentially to build topical knowledge.
Intermediate Concepts
CM to Inches Explained: Formula, Math, and Applications
Learn the mathematics, formulas, and real-world applications behind the CM to Inches.
Inches to CM Explained: Formula, Math, and Applications
Learn the mathematics, formulas, and real-world applications behind the Inches to CM.
KG to Pounds Explained: Formula, Math, and Applications
Learn the mathematics, formulas, and real-world applications behind the KG to Pounds.
Pounds to KG Explained: Formula, Math, and Applications
Learn the mathematics, formulas, and real-world applications behind the Pounds to KG.
Celsius to Fahrenheit Explained: Formula, Math, and Applications
Learn the mathematics, formulas, and real-world applications behind the Celsius to Fahrenheit.
Fahrenheit to Celsius Explained: Formula, Math, and Applications
Learn the mathematics, formulas, and real-world applications behind the Fahrenheit to Celsius.
Unit Conversions Frequently Asked Questions
Common questions and answers regarding our unit conversions calculators and methods.