Life
Having identical twins
Odds
1 in 250
per birth (natural, approx.) · Global / US (illustrative)
What this means
Identical twinning is relatively stable across populations; overall twin rates rise with ART mostly through dizygotic twins.
Methodology
Monozygotic twinning is roughly ~3–4 per 1,000 births naturally (~1 in 250–333). Fertility treatments raise overall twin rates mainly via fraternal twins.
Updated 2026-01-15
Source
CDC / medical summaries ↗Share
Odds of having identical twins: 1 in 250 (per birth (natural, approx.)). — How Likely Is That? https://www.howlikelyisthat.com/odds/odds-of-having-identical-twins
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