round off to

round off to something

 and round up to something; round down to something
to express a number in the nearest whole amount or nearest group of 1, 10, 100, 1,000, 1/10, 1/100, 1/1000, etc. When doing taxes, Anne rounded her figures off to the nearest dollar. These census population figures are rounded up to the nearest million.
See also: off, round