Tell me what to convert. For example: "centimeter to inch".

Tips:
There is no need to specify the country code or the type of the units. The converter will automatically include all definitions for the units. The only thing you need to input is the names of the units.
Examples:
~~international~~ acre to ~~Irish~~ acre
Instead you should only write:
acre to acre

acre to square chain

More than one definitions are found

Area Conversion
From	To
1 acre [ac][international]	= 10 square chain [ch2][English Survey]
1 acre [ac][international]	= 4.356 square chain [ch2][Engineer's Chain]
1 acre [ac][international]	= 10.117141056 square chain [ch2][metric]
1 acre [ac][metric]	= 24.7105381467165 square chain [ch2][English Survey]
1 acre [ac][metric]	= 10.7639104167097 square chain [ch2][Engineer's Chain]
1 acre [ac][metric]	= 25 square chain [ch2][metric]
1 acre [ac][Ireland]	= 16.1977577551727 square chain [ch2][English Survey]
1 acre [ac][Ireland]	= 7.05574327815322 square chain [ch2][Engineer's Chain]
1 acre [ac][Ireland]	= 16.3875 square chain [ch2][metric]

Quantity & Converter(s)
Unit Name	Quantity
acre [ac][international]	Area
square chain [ch2][English Survey]	Area
square chain [ch2][Engineer's Chain]	Area
square chain [ch2][metric]	Area
acre [ac][metric]	Area
acre [ac][Ireland]	Area