Calculators & converters
Convert between metric and imperial units: length, weight, temperature, area (perches, acres, hectares), volume, speed, data and time.
Pick the kind of unit: length, weight, area and so on.
Type a value and choose the units to convert from and to.
The table shows the value in every other unit too.
One perch is 25.29 square metres (272.25 square feet). 160 perches make one acre; land in Sri Lanka is usually measured in perches.
A megabyte (MB) is 1,000,000 bytes; a mebibyte (MiB) is 1,048,576 bytes. Disk makers use MB, Windows shows MiB but calls it MB.
Yes, they use the official definitions (an inch is exactly 2.54 cm, a pound 0.45359237 kg). Results are rounded to 10 significant digits.
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