Multiples in comparisons (kertaa, puolta)

Expressing Multiples with Kertaa

To say something is "twice as large" or "three times cheaper," use a numeral followed by kertaa (times) and the comparative form of an adjective.

The new kitchen island is twice as narrow as the old one.
Uusi saareke on kaksi kertaa kapeampi kuin vanha.
The tiling of the washroom was twice as expensive as the kitchen's.
Pesuhuoneen laatoitus oli kaksi kertaa kalliimpi kuin keittiön.

Where English might use fractions like "a third of the price," Finnish typically expresses this with a multiple of the "lesser" trait (e.g., kolme kertaa halvempi, literally "three times cheaper").

One square meter of this tiling is three times cheaper.
Yksi neliömetri tätä laatoitusta on kolme kertaa halvempi.

Expressing Halves with Puolta

While you can say kaksi kertaa pienempi (two times smaller), Finnish often uses puolta (the partitive of puoli, "half") followed by a comparative adjective to express "half as [adjective]" or "fifty percent more [adjective]."

When we made the extension, the new partition wall was half as thick.
Kun teimme laajennuksen, uusi väliseinä oli puolta ohuempi.
The cost estimate for the washroom is fifty percent more expensive than we thought.
Pesuhuoneen kustannusarvio on puolta kalliimpi kuin luulimme.

Remodeling Vocabulary

You will frequently use these comparative structures alongside common home renovation vocabulary like pohjapiirros (floor plan) and laajennus (extension).

The extension made the floor plan twice as large.
Laajennus teki pohjapiirroksen kaksi kertaa suuremmaksi.