Common Units
Length, weight, temperature, volume, area, speed and timezone converters.
Fuel Cost Calculator
Estimate fuel used and trip cost from distance, efficiency and price.
Speed Calculator
Solve speed, distance or time from the other two — km/h, m/s, mph.
Unit Converter
Length, weight, temperature, area, volume & speed — all in one.
Timezone Converter
See one instant across the world's major timezones.
Height Converter
Convert height between cm, m, ft, in — with feet-and-inches notation.
Speed Converter
Convert between m/s, km/h, mph, knots, ft/s, and Mach.
Temperature Converter
Convert between Celsius, Fahrenheit, Kelvin, and Rankine.
Distance Converter
Convert length across mm, cm, m, km, in, ft, yd, mi, nmi, light-years.
Weight Converter
Convert mass across mg, g, kg, t, oz, lb, stone, US and UK tons.
Volume Converter
Convert volume across metric, US, and UK liquid units.
Energy Converter
Convert between joules, calories, kWh, BTU, and eV.
Density Converter
Convert density across kg/m³, g/cm³, lb/ft³, lb/in³, and more.
Angle Converter
Convert between degrees, radians, gradians, arcminutes, and more.
Frequency Converter
Convert between Hz, kHz, MHz, GHz, RPM, and angular units.
Fuel Economy Converter
Convert between MPG (US/UK), L/100km, and km/L.
Area Converter
Convert between m², ft², acres, hectares, and more.
Pressure Converter
Convert between Pa, bar, atm, psi, torr, and more.
Unix Timestamp Converter
Convert Unix timestamps to dates and back — live, two-way, private.
Countdown Timer
Count down to any future date — days, hours, minutes, seconds.
Stopwatch
Accurate stopwatch with laps — centisecond precision, no uploads.
World Clock
Live time in New York, London, Dubai, Tokyo, Sydney & your city.
Pomodoro Timer
Focus 25 / break 5 / long break 15 — configurable productivity timer.
Multi-Calendar Converter
Convert any Gregorian date to Hijri & Persian (Jalali) — instant, private.
Week Number Calculator
Get the ISO 8601 week number for any date — live, accurate, private.
Workday Calculator
Count working days between two dates — exclude weekends & holidays.
Calendar Generator
Print or download a clean month calendar — Sunday or Monday start.
Alarm Clock
Set an alarm that beeps, flashes and toasts — snooze included.
Common Unit Converters
Unit converters translate between measurement systems used worldwide. Convert metric to imperial, Celsius to Fahrenheit, or kilometers to miles instantly.
Our converters use exact mathematical factors for precise results. Whether you are cooking with international recipes, traveling between countries, or working with international specifications.
Each converter handles a specific group of related units. Select your input and output units for instant, accurate conversion.