Unit Converters
Free online unit converters for every need — length, weight, temperature, currency, and 100+ more.
Common
Length Converter
Instantly convert between all units of length and distance — meters, feet, inches, kilometers, miles, yards, and more. Free online length converter for everyday and scientific use.
Weight and Mass Converter
Convert weight and mass units instantly — kilograms, pounds, grams, ounces, tons, and more. Accurate and easy-to-use online weight converter for cooking, shipping, and science.
Volume Converter
Convert volume units effortlessly — liters, gallons, milliliters, cubic feet, fluid ounces, and more. Perfect for cooking, engineering, and everyday volume conversions.
Temperature Converter
Convert temperatures between Celsius, Fahrenheit, Kelvin, and Rankine instantly. Use our free online temperature converter for weather, cooking, and scientific calculations.
Area Converter
Convert area units quickly and accurately — square meters, acres, hectares, square feet, square kilometers, and more. Ideal for real estate, land measurement, and construction.
Pressure Converter
Convert pressure units including pascals, bar, PSI, atmospheres, torr, and more. Free online pressure converter for engineering, science, and industrial applications.
Energy Converter
Convert energy units instantly — joules, calories, kilowatt-hours, BTU, electronvolts, and more. Use our free energy converter for physics, nutrition, and engineering needs.
Power Converter
Convert power units including watts, kilowatts, horsepower, megawatts, and more. Accurate online power converter for mechanical, electrical, and engineering calculations.
Force Converter
Convert force units including newtons, pound-force, kilogram-force, dynes, and more. Free online force converter for physics, engineering, and scientific applications.
Time Converter
Convert time units instantly — seconds, minutes, hours, days, weeks, months, and years. Simple and accurate online time unit converter for everyday and scientific use.
Speed Converter
Convert speed and velocity units instantly — km/h, mph, m/s, knots, and more. Free online speed converter for travel, sports, physics, and engineering.
Angle Converter
Convert angle units including degrees, radians, gradians, arcminutes, arcseconds, and more. Accurate online angle converter for geometry, trigonometry, and engineering.
Physics & Engineering
Fuel Consumption Converter
Convert fuel consumption and efficiency units — MPG, L/100km, km/L, and more. Free online fuel economy converter for cars, trucks, and fleet management.
Acceleration Converter
Convert acceleration units including m/s², g-force, ft/s², Gal, and more. Accurate online acceleration converter for physics, aerospace, and mechanical engineering.
Angular Acceleration Converter
Convert angular acceleration units including rad/s², deg/s², and rev/min². Free online angular acceleration converter for rotational dynamics and mechanical engineering.
Density Converter
Convert density units instantly — kg/m³, g/cm³, lb/ft³, lb/in³, and more. Free online density converter for material science, chemistry, and engineering.
Specific Volume Converter
Convert specific volume units including m³/kg, L/kg, ft³/lb, and more. Accurate online specific volume converter for thermodynamics and fluid mechanics.
Moment of Inertia Converter
Convert moment of inertia units — kg·m², g·cm², lb·ft², and more. Free online moment of inertia converter for mechanical engineering and rotational dynamics.
Moment of Force Converter
Convert moment of force units including N·m, lbf·ft, kgf·m, and more. Free online bending moment converter for structural and mechanical engineering calculations.
Torque Converter
Convert torque units instantly — newton-meters, pound-feet, kilogram-force centimeters, and more. Accurate online torque converter for automotive, mechanical, and industrial engineering.
Fuel Efficiency by Mass Converter
Convert fuel efficiency by mass units — km/kg, miles/lb, and more. Free online mass-based fuel efficiency converter for rocket propulsion and alternative fuel vehicles.
Fuel Efficiency by Volume Converter
Convert volumetric fuel efficiency units — L/100km, MPG, km/L, and more. Accurate online fuel economy converter for vehicles, fleet management, and emissions calculations.
Electrical & Magnetic
Electric Charge Converter
Convert electric charge units — coulombs, millicoulombs, microcoulombs, ampere-hours, and more. Free online electric charge converter for electronics, electrochemistry, and physics.
Linear Charge Density Converter
Convert linear charge density units — C/m, mC/mm, μC/cm, and more. Free online linear charge density converter for electrostatics and electrical engineering.
Surface Charge Density Converter
Convert surface charge density units — C/m², mC/cm², μC/mm², and more. Accurate online surface charge density converter for capacitor design and electrostatics.
Volume Charge Density Converter
Convert volume charge density units — C/m³, mC/cm³, μC/mm³, and more. Free online volume charge density converter for electrostatics, plasma physics, and electrical engineering.
Electric Current Converter
Convert electric current units — amperes, milliamperes, microamperes, kiloamperes, and more. Free online current converter for electronics, electrical engineering, and circuit design.
Linear Current Density Converter
Convert linear current density units — A/m, mA/cm, kA/m, and more. Free online linear current density converter for electromagnetics and electrical engineering.
Surface Current Density Converter
Convert surface current density units — A/m², mA/cm², kA/m², and more. Accurate online surface current density converter for electromagnetic field analysis and power systems.
Electric Field Strength Converter
Convert electric field strength units — V/m, kV/m, N/C, and more. Free online electric field converter for electrostatics, antenna design, and electromagnetic compatibility.
Electric Potential Converter
Convert electric potential and voltage units — volts, millivolts, kilovolts, megavolts, and more. Free online voltage converter for electronics, power systems, and electrical engineering.
Electric Resistance Converter
Convert electric resistance units — ohms, kilohms, megaohms, milliohms, and more. Free online resistance converter for circuit design, electronics, and electrical engineering.
Electric Resistivity Converter
Convert electrical resistivity units — Ω·m, Ω·cm, μΩ·in, and more. Accurate online resistivity converter for material science, semiconductor design, and conductor selection.
Electric Conductance Converter
Convert electric conductance units — siemens, millisiemens, microsiemens, mho, and more. Free online conductance converter for electronics, electrochemistry, and electrical circuit analysis.
Electric Conductivity Converter
Convert electrical conductivity units — S/m, mS/cm, μS/cm, and more. Free online conductivity converter for water quality testing, material science, and electrochemistry.
Capacitance Converter
Convert capacitance units — farads, microfarads, nanofarads, picofarads, and more. Free online capacitance converter for electronics, circuit design, and electrical engineering.
Inductance Converter
Convert inductance units — henries, millihenries, microhenries, nanohenries, and more. Free online inductance converter for electronics, RF engineering, and coil and transformer design.
Magnetomotive Force Converter
Convert magnetomotive force units — ampere-turns, gilberts, kiloampere-turns, and more. Free online MMF converter for magnetic circuit design and electromagnetic engineering.
Magnetic Field Strength Converter
Convert magnetic field strength units — A/m, oersteds, kA/m, and more. Accurate online H-field converter for electromagnetics, motor design, and magnetic material characterization.
Magnetic Flux Converter
Convert magnetic flux units — webers, milliwebers, maxwells, and more. Free online magnetic flux converter for transformer design, motor engineering, and electromagnetic analysis.
Magnetic Flux Density Converter
Convert magnetic flux density units — tesla, millitesla, gauss, microtesla, and more. Free online B-field converter for MRI, motor design, and electromagnetic engineering.
Thermodynamics & Heat
Temperature Interval Converter
Convert temperature interval and difference units between Celsius, Fahrenheit, Kelvin, and Rankine scales. Free online temperature difference converter for thermodynamics and HVAC.
Thermal Expansion Converter
Convert thermal expansion coefficient units — per Kelvin, per Celsius, per Fahrenheit, and more. Free online thermal expansion converter for materials science and engineering.
Thermal Resistance Converter
Convert thermal resistance units including K/W, °C/W, and °F·h/BTU. Accurate online thermal resistance converter for HVAC, insulation, and electronics cooling design.
Thermal Conductivity Converter
Convert thermal conductivity units — W/(m·K), BTU/(h·ft·°F), cal/(s·cm·°C), and more. Free online thermal conductivity converter for insulation, materials, and heat transfer engineering.
Specific Heat Capacity Converter
Convert specific heat capacity units — J/(kg·K), BTU/(lb·°F), cal/(g·°C), and more. Accurate online specific heat converter for thermodynamics, chemistry, and material science.
Heat Density Converter
Convert heat density units including J/m³, BTU/ft³, and cal/cm³. Free online heat density converter for combustion engineering, fuel analysis, and thermodynamic systems.
Heat Flux Density Converter
Convert heat flux density units — W/m², BTU/(h·ft²), cal/(s·cm²), and more. Free online heat flux converter for thermal engineering, solar energy, and building insulation.
Heat Transfer Coefficient Converter
Convert heat transfer coefficient units — W/(m²·K), BTU/(h·ft²·°F), and more. Accurate online converter for convection, conduction, and HVAC engineering calculations.
Fluid Mechanics
Volumetric Flow Rate Converter
Convert volumetric flow rate units — m³/s, liters per minute, gallons per minute, CFM, and more. Free online flow rate converter for plumbing, HVAC, and fluid engineering.
Mass Flow Rate Converter
Convert mass flow rate units — kg/s, lb/min, g/h, and more. Accurate online mass flow converter for chemical processing, aerospace, and industrial fluid systems.
Molar Flow Rate Converter
Convert molar flow rate units — mol/s, kmol/h, lbmol/min, and more. Free online molar flow converter for chemical engineering, reaction kinetics, and process design.
Mass Flux Density Converter
Convert mass flux density units — kg/(m²·s), lb/(ft²·s), and more. Free online mass flux converter for chemical engineering, filtration, and membrane technology.
Dynamic Viscosity Converter
Convert dynamic viscosity units — Pa·s, centipoise, poise, lb/(ft·s), and more. Free online dynamic viscosity converter for fluid mechanics, lubrication, and chemical engineering.
Kinematic Viscosity Converter
Convert kinematic viscosity units — m²/s, centistokes, stokes, ft²/s, and more. Accurate online kinematic viscosity converter for fluid dynamics, oil analysis, and hydraulic systems.
Surface Tension Converter
Convert surface tension units — N/m, mN/m, dyne/cm, lbf/ft, and more. Free online surface tension converter for chemistry, materials science, and fluid interface studies.
Permeability Converter
Convert permeability units including darcy, millidarcy, m², and more. Free online permeability converter for petroleum engineering, hydrogeology, and porous media analysis.
Chemistry
Molar Concentration Converter
Convert molar concentration units — mol/L, mmol/L, mol/m³, and more. Free online molarity converter for chemistry, biochemistry, and laboratory solution preparation.
Solution Concentration Converter
Convert solution concentration units — ppm, ppb, mg/L, percent, g/L, and more. Accurate online concentration converter for chemistry, water treatment, and environmental testing.
Radiation Exposure Dose Converter
Convert radiation exposure dose units — roentgens, coulombs/kg, milliroentgens, and more. Free online exposure dose converter for radiology, health physics, and radiation protection.
Light & Optics
Luminance Converter
Convert luminance units — cd/m² (nits), foot-lamberts, stilb, and more. Free online luminance converter for display technology, photography, and lighting design.
Luminous Intensity Converter
Convert luminous intensity units — candela, millicandela, candlepower, and more. Accurate online luminous intensity converter for photometry, LED design, and lighting engineering.
Illuminance Converter
Convert illuminance units — lux, foot-candles, phot, nox, and more. Free online illumination converter for lighting design, photography, and workplace safety compliance.
Digital Image Resolution Converter
Convert digital image resolution units — DPI, PPI, dots/cm, pixels/mm, and more. Free online resolution converter for photography, printing, and graphic design.
Wavelength Converter
Convert wavelength units and calculate frequency across the electromagnetic spectrum — nanometers, micrometers, angstroms, and more. Free online wavelength converter for optics and physics.
Construction & Building
Rebar Weight Calculator
Calculate the total weight of steel rebar for your construction project. Enter bar diameter, length, and quantity to get accurate rebar weight in kg or lbs. Free online rebar weight calculator.
Concrete Volume Calculator & Converter
Calculate concrete volume for slabs, columns, beams, and footings — and convert between cubic meters, cubic feet, and cubic yards. Free online concrete volume calculator for construction projects.
Concrete Mix Ratio Calculator
Convert concrete mix ratios and calculate exact cement, sand, and aggregate quantities for any volume. Free online concrete mix calculator for M10, M15, M20, M25, and custom mix designs.
Brick Calculator
Calculate how many bricks you need for any wall or project. Enter wall dimensions and brick size to get an accurate brick count with mortar allowance. Free online brick quantity estimator.
Tile Calculator
Calculate how many tiles you need for any floor or wall area. Enter room and tile dimensions to get an accurate tile count with waste factor included. Free online tile quantity calculator.
Cement, Sand & Aggregate Calculator
Calculate exact quantities of cement, sand, and aggregate needed for your concrete mix. Enter volume and mix ratio to get material amounts in kg, bags, and cubic meters. Free construction material calculator.
Lumber Board Feet Calculator
Calculate board feet of lumber instantly. Enter thickness, width, and length to get total board footage for any wood project. Free online lumber board feet converter for construction and carpentry.
Floor Area Converter
Convert floor area between square meters, square feet, square yards, and more. Free online floor area converter for real estate, interior design, and construction planning.
Roofing Sheet Coverage Calculator
Calculate how many roofing sheets you need for your roof area. Enter roof dimensions, sheet size, and overlap to get an accurate sheet count. Free online roofing coverage calculator.
Cooking & Baking
Cups to Grams Converter
Convert cups to grams for flour, sugar, butter, rice, oats, and 50+ ingredients. Get accurate weight measurements for any recipe with our free online cups to grams converter.
Cups to ml Converter
Convert cups to milliliters, tablespoons, fluid ounces, and liters instantly. Free online cups to ml converter for accurate liquid measurements in any recipe or cooking project.
Oven Temperature Converter
Convert oven temperatures between Celsius, Fahrenheit, and gas marks instantly. Free online oven temperature converter for baking — perfect for following recipes from any country.
Baking Pan Size Converter
Convert between baking pan sizes and find equivalent pan volumes to scale any recipe. Free online baking pan converter for round, square, rectangular, and springform tins.
Ingredient Density Converter
Convert between volume and weight for common cooking ingredients using accurate density values. Free online ingredient converter for baking, cooking, and precise recipe scaling.
Sourdough Hydration Calculator
Calculate sourdough hydration percentage and convert between flour and water ratios instantly. Free online sourdough hydration converter for perfect bread dough consistency every time.
Media & Design
Image DPI Converter
Convert image DPI and calculate print size from pixel dimensions. Free online image DPI converter for photographers, designers, and print-ready file preparation.
Video Frame Rate Converter
Convert video frame rates between 24fps, 30fps, 60fps, 120fps, and more. Calculate total frames for any video duration. Free online frame rate converter for video editors and filmmakers.
Audio Bitrate Converter
Convert audio bitrate units and calculate file size from bitrate and duration. Free online audio bitrate converter for music production, podcasting, and streaming optimization.
Unix Timestamp Converter
Convert Unix timestamps to readable dates and times — and back again. Free online epoch time converter for developers, database administrators, and system engineers.
Frequency to Musical Note Converter
Convert any frequency in Hz to its corresponding musical note and octave — and back again. Free online pitch frequency converter for musicians, audio engineers, and music theory students.
Time & Date
Time Duration Calculator
Calculate the exact duration between two times or add and subtract time intervals easily. Free online time duration calculator for work hours, project planning, and scheduling.
Age Calculator
Calculate your exact age in years, months, and days from your date of birth. Free online age calculator — also find the age on any past or future date.
Date Difference Calculator
Calculate the exact number of days, weeks, months, and years between any two dates. Free online date difference calculator for deadlines, anniversaries, and event planning.
Astronomy & Space
Light-Years to Parsecs Converter
Convert astronomical distances between light-years, parsecs, astronomical units, and kilometers. Free online space distance converter for astronomy, astrophysics, and science education.
Astronomical Unit (AU) Converter
Convert astronomical units to light-years, parsecs, kilometers, miles, and more. Free online AU converter for planetary science, astronomy, and space exploration calculations.
Apparent Magnitude Converter
Convert between apparent magnitude, absolute magnitude, and stellar luminosity. Free online magnitude converter for amateur astronomers, astrophysics students, and stargazers.
Planet Weight Calculator
Find out how much you would weigh on Mars, Jupiter, the Moon, and other planets. Free online planet weight calculator based on surface gravity for astronomy and science education.
Health & Fitness
BMI Calculator — Body Mass Index
Calculate your Body Mass Index (BMI) from height and weight. Find out if you're underweight, normal weight, overweight, or obese. Free online BMI calculator for adults and children.
Calorie Burn Rate Calculator
Estimate calories burned per hour for running, cycling, swimming, walking, and more. Free online calorie burn rate converter based on activity type and body weight.
Running Pace to Speed Converter
Convert running pace (min/km or min/mile) to speed (km/h or mph) instantly. Free online running pace converter for athletes, marathon runners, and fitness tracking.
Height Converter — cm to ft & in
Convert height between centimeters, feet and inches, and meters. Free online height converter — instantly see your height in any unit, perfect for profiles, travel, and fitness.
Shoe Size Converter
Convert shoe sizes between US, UK, EU, and international standards for men, women, and kids. Free online shoe size converter for global shopping and footwear retail.
Ring Size Converter
Convert ring sizes between US, UK, EU, French, Swiss, and Japanese standards. Free online ring size converter for jewelry shopping, gifting, and custom ring orders worldwide.
Weather & Environment
Wind Speed Converter
Convert wind speed between km/h, mph, knots, m/s, and Beaufort scale. Free online wind speed converter for meteorology, sailing, aviation, and weather analysis.
Rainfall Converter
Convert rainfall measurements between millimeters, inches, liters per square meter, and more. Free online precipitation converter for meteorology, hydrology, and agriculture.
Humidity Ratio Converter
Convert between relative humidity, absolute humidity, specific humidity, and humidity ratio. Free online humidity converter for HVAC, meteorology, and building climate control.
Dew Point Calculator
Calculate dew point temperature from relative humidity and air temperature instantly. Free online dew point calculator for weather forecasting, HVAC design, and condensation analysis.
Textiles & Clothing
Fabric GSM Converter
Convert fabric weight between GSM, oz/yd², and other textile units. Free online fabric GSM converter for fashion designers, garment manufacturers, and textile buyers.
Thread Count Converter
Convert and compare thread count values across different measurement standards for bed sheets and fabrics. Free online thread count converter for textile buyers and bedding shoppers.
Clothing Size Converter
Convert clothing sizes between US, UK, EU, and Asian standards for men, women, and kids. Free online clothes size converter for international shopping and fashion retail.
Other
Data Storage Converter
Convert digital storage units — bytes, kilobytes, megabytes, gigabytes, terabytes, and beyond. Free online data storage converter for computing, cloud storage, and IT professionals.
Dry Volume Converter
Convert dry volume units including dry pints, dry gallons, bushels, pecks, and more. Accurate online dry measure converter for agriculture, cooking, and commodity trading.
Angular Velocity Converter
Convert angular velocity units — radians per second, degrees per second, RPM, and more. Free online angular velocity converter for physics, mechanics, and engineering.
Frequency Converter
Convert frequency units — hertz, kilohertz, megahertz, gigahertz, RPM, and more. Free online frequency converter for electronics, audio engineering, and signal processing.
Radiation Dose Converter
Convert radiation dose units — gray, rad, sievert, rem, and more. Free online radiation dose converter for medical physics, radiology, nuclear safety, and health physics.
Radioactivity Converter
Convert radioactivity units — becquerels, curies, millicuries, rutherfords, and more. Free online radioactivity converter for nuclear medicine, radiation safety, and physics.
Sound Pressure Converter — Pa to dB
Convert sound pressure between pascals and decibels (dB SPL) instantly. Free online sound pressure converter for acoustics, audio engineering, and noise measurement.
Horsepower to Animals Converter
How many horses is your car's engine worth? Convert horsepower to fun animal equivalents — horses, hamsters, elephants, and more. A lighthearted power converter for curious minds.