Finnish (fi)

Complete reference for the fi locale — live Intl API output, CLDR plural rules, and framework config snippets.

Locale reference

Locale metadata

BCP 47 codefi

Native nameSuomi

English nameFinnish

Languagefi

RegionNone (base locale)

ScriptLatn

Text directionLeft-to-right (LTR)

CLDR plural categoriesone, other

Estimated speakers~5,500,000

Intl API Live Output

DateTimeFormat

Short14.9.2026

Medium14.9.2026

Long14. syyskuuta 2026

Fullmaanantai 14. syyskuuta 2026

NumberFormat

Decimal1 234 567,89

Currency (USD)9,99 $

Percent75 %

Compact1,2 milj.

RelativeTimeFormat

3 päivää sitten

Output for: -3 days ago

ListFormat

apples, oranges ja bananas

Conjunction list: apples, oranges, bananas

CLDR Plural Rules

Categories supported by fi: one, other

oneExample number: 1

→ one

otherExample number: 100

→ other

Framework Config Snippets

next-intl

// next-intl configuration
// next.config.ts
import createNextIntlPlugin from 'next-intl/plugin';
const withNextIntl = createNextIntlPlugin();
export default withNextIntl({});

// i18n/routing.ts
import { defineRouting } from 'next-intl/routing';
export const routing = defineRouting({
  locales: ['fi', 'en'],
  defaultLocale: 'en',
});

react-intl

// react-intl configuration
import { IntlProvider } from 'react-intl';
import messages from './messages/fi.json';

function App() {
  return (
    <IntlProvider locale="fi" messages={messages}>
      {/* your app */}
    </IntlProvider>
  );
}

i18next

// i18next configuration
import i18n from 'i18next';
import { initReactI18next } from 'react-i18next';

i18n
  .use(initReactI18next)
  .init({
    lng: 'fi',
    fallbackLng: 'en',
    resources: {
      'fi': {
        translation: require('./locales/fi/translation.json'),
      },
    },
  });

export default i18n;