Laravel localization in Finnish Suomi

Locale codes

Set the base locale in config/app.php. For regional variants, Finnish commonly uses: fi_FI

// config/app.php
'locale' => 'fi',
'fallback_locale' => 'en',

// Or switch at runtime
App::setLocale('fi');

Plural rules: what Finnish actually needs

CLDR defines 2 cardinal categories for Finnish. The sample numbers below were computed by ICU for this exact locale:

Laravel's trans_choice() maps numbers to 2 pipe-separated forms for this locale:

// lang/fi/messages.php
'items' => ':count item|:count items'

// Usage
trans_choice('messages.items', $count, ['count' => $count]);

Try any number live in the pluralization tester.

Localized dates with Carbon

Real output for Finnish (fi locale), generated by Carbon for March 21, 2026:

$date = now()->locale('fi');

$date->translatedFormat('l, j F Y');
// "lauantai, 21 maaliskuu 2026"

$date->isoFormat('LLLL');
// "21. maaliskuuta 2026 14.30"

$date->isoFormat('L');
// "21.3.2026"

$date->subDays(3)->diffForHumans();
// "3 kuukautta sitten"

What to watch out for in Finnish

• Agglutinative with roughly 15 grammatical cases; suffixes replace prepositions, so concatenated placeholders often break grammar.
• Vowel harmony determines suffix vowels (a/ä, o/ö, u/y), so endings cannot be appended blindly.
• No grammatical gender and no articles; informal sinä is standard in modern UI copy.
• Decimal comma with space as thousands separator (1 234,56); dates are written d.m.yyyy.

Framework strings already translated

Laravel's own validation, auth and pagination strings are maintained in Finnish by the open-source Laravel-Lang project (MIT). Install them, then manage your app's own strings live:

composer require laravel-lang/common --dev
php artisan lang:add fi
php artisan lang:update