Online Converters
Type a value, choose the units and the answer appears as you type. Each converter lists the exact conversion factor and a quick-reference table.
Converters by category
Units & Numbers converters
- Roman Numerals ConverterType a whole number to see its Roman numeral, or type a Roman numeral such as MCMXCIV to see the number. The answer updates as you type.
- Data Units ConverterPick a number, a unit to convert from and a unit to convert to. Storage sizes convert to storage sizes and transfer speeds to transfer speeds; tick the SI box to count in thousands instead of 1,024s. The binary names, KiB to EiB, always count in 1,024s.
- Length ConverterPick a unit, type a length, choose the unit you want and read the answer. The converter covers metric, imperial and nautical units in one place.
- Area ConverterPick a unit on each side, type an area and the converted value appears straight away. Every conversion passes through square meters, using exact factors such as 1 acre = 4,046.8564224 m².
Date & Time converters
- Time Zone ConverterEnter a date and time, choose the zone it is in and the zone you want, and read the converted time in your own locale format and on a 24 hour clock.
- 24 Hour to 12 Hour Time ConverterChoose a direction, type a time such as 17:30 or 5:30 PM, and the converted time appears underneath. A chart of all 24 hours is included for a quick lookup.
- Time ConverterEnter an amount of time, pick the unit it is in and the unit you want, and the answer appears straight away. Thirteen units are supported, from nanoseconds to centuries.
- Time to Decimal ConverterEnter hours and minutes and the converter returns the total as decimal hours or as minutes. Empty boxes count as zero, and the answer is rounded to two decimal places.
Cooking converters
- Cups to Grams ConverterPick an ingredient, enter a number of cups and read the weight in milligrams, grams or kilograms. A cup holds volume, so the answer depends on how dense the ingredient is.
- Grams to Cups ConverterPick an ingredient, enter a weight in milligrams, grams or kilograms and read it as cups. The same grams fill a different number of cups for every ingredient.
- Recipe ConverterPick an ingredient, enter an amount and choose the units to convert between. Weights and volumes are linked using each ingredient's density, and the answer updates as you type.