Iceland Number Format
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Format Rules
Iceland formatting implementation notes
For Iceland, format numbers with the explicit locale is-IS; the reference value 1234567.89 renders as 1.234.568.
Iceland's reference format uses "," as the decimal mark and period (".") for grouping. The integer uses repeating groups of three digits. Pass "is-IS" directly to Intl.NumberFormat instead of replacing punctuation in a preformatted string.
ISK is shown with kr. after the amount with a separating space; the same reference value renders as 1.234.568 kr.. The percent sign appears after the amount with a separating space. Use the ISO currency code for storage and interchange because a visible symbol can be shared by unrelated currencies.
Western 0–9 digits are the page's reference digit system, and the negative pattern is -n. Treat is-IS as the reference locale for this page, but still respect the user's explicitly selected language and numbering-system preferences. Validate output with formatToParts() when spacing, signs, or bidirectional literals affect the interface.
- Locale: is-IS
- Decimal and grouping: 1.234.568
- Currency: ISK → 1.234.568 kr.
- Digits: Western 0–9 digits
Reviewed 19 July 2026. Sources: Unicode locale number formats · Intl.NumberFormat reference
Code Examples
// Basic number
new Intl.NumberFormat('is-IS').format(1234567.89)
// → "1.234.568"
// Currency
new Intl.NumberFormat('is-IS', {
style: 'currency',
currency: 'ISK'
}).format(1234567.89)
// → "1.234.568 kr."
// Percentage
new Intl.NumberFormat('is-IS', {
style: 'percent',
minimumFractionDigits: 1
}).format(0.125)
// Compact notation
new Intl.NumberFormat('is-IS', {
notation: 'compact'
}).format(1234567)Negative Number Formats
new Intl.NumberFormat('is-IS').format(-1234567.89)new Intl.NumberFormat('is-IS', { style: 'currency', currency: 'ISK', currencySign: 'accounting' }).format(-1234567.89)Edge Cases & Notes
ISK has no minor unit.
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