Basic Unit Converters: Time, Speed, Mass and More

Use these basic unit converters to switch between measurements of time, speed, weight or mass, and angles. The Time Converter and Speed Converter help with schedules, travel, and motion problems, while Weight or Mass and Water Weight support cooking, shipping, and other practical calculations.You can also explore specialized tools such as Feet Per Minute to CFM, Permille to Decimal and Meter, and Circle to Angle Units. Whether you are checking homework, comparing specifications, or planning a project, these calculators help you work with unfamiliar units.

Feet Per Minute to CFM

Convert air velocity in feet per minute to airflow in cubic feet per minute. Enter the velocity and cross-sectional area, then select the area unit.

Permille to Decimal and Meter

Convert a permille (‰) value to a decimal, or find its equivalent distance in meters over 1 km. Enter the value and choose a result under Convert to.

Water Weight

Convert a quantity of water between volume and mass units. Enter a value, then choose the From and To units to see the equivalent at an assumed density of 1 kg/L.

Weight / Mass

Convert a mass value between grams, kilograms, pounds, ounces, tons, and other units. Enter the value, then choose the From Unit and To Unit.

Grams to Ounces

Convert grams to ounces and ounces back to grams instantly. Choose avoirdupois ounces for everyday weights or troy ounces for gold and silver, and get the exact formula, a pounds-plus-ounces breakdown, and full conversion tables.

kg to lbs

Convert kilograms to pounds and pounds to kilograms using the exact 1959 definition 1 lb = 0.45359237 kg. Enter a weight in either field and also get ounces, grams, and stone.

Circle to Angle Units

Convert an angle between degrees, radians, gradians, sextants, arcminutes, and arcseconds. Enter an angle value, then select the source and target units.

Speed Converter

Convert a speed between km/h, mph, m/s, ft/s, knots and Mach instantly. Enter any value, pick the unit, and see the equivalent in all other common speed units.

Time Converter

Convert a time value between nanoseconds, milliseconds, seconds, minutes, hours, days, weeks, months and years. Enter any value, pick the source unit, and see the result in every other unit at once.

Calculators