Iambic pentameter checker

Iambic pentameter is a line of five iambs: ten syllables with stress on every even beat (da-DUM da-DUM da-DUM da-DUM da-DUM). The name comes from Greek iambos (the foot) and pentametros (five feet).

Geoffrey Chaucer brought a ten-syllable iambic line into English in the fourteenth century, drawing on French and Italian models. By the sixteenth century it was the main meter of English verse—used rhymed in sonnets and heroic couplets, and unrhymed as blank verse in drama and epic.

Poets rarely stay perfectly regular. First-foot inversions, feminine endings (an extra trailing weak syllable), and other substitutions are common; the five-beat iambic feel remains the baseline.

English iambic pentameter is five iambs per line: ten syllables with expected stress on positions 2, 4, 6, 8, and 10 (da-DUM × 5). lyriic’s catalog uses that single-line cycle with no fixed stanza length.

The same ten-syllable iambic grid underlies blank verse (unrhymed), English sonnets, and heroic couplets. Those forms add rhyme or stanza constraints; this checker only targets the open line meter.

Real poems often invert the first foot, add a feminine ending, or loosen stress for speech. lyriic marks the ideal weak–strong grid from the dictionary so you can see where a draft matches or drifts.

An iamb is a two-syllable foot with a light beat then a strong one: da-DUM. Everyday words such as “today,” “because,” and “away” often fall into that shape.

Stack iambs and you get iambic meter. Three feet make trimeter (six syllables), four make tetrameter (eight), five make pentameter (ten)—the backbone of blank verse, sonnets, and much English lyric.

When stress-aware checking is on, lyriic marks the expected weak–strong pairs from dictionary stress and compares them to the meter’s contour. Real speech bends the ideal; the marks show the target pattern, not a claim that every poem must be perfectly regular.

Iambic pentameter expects five da-DUM feet: ten syllables with strong beats on positions 2, 4, 6, 8, and 10. It is the default contour for blank verse, English sonnets, and heroic couplets in this catalog.

lyriic checks that ten-slot weak–strong grid when the stress pack is loaded; substitutions and feminine endings are common in practice and will show as mismatches against the ideal.

Blank verse, English sonnets, and heroic couplets all use this meter under different rhyme and stanza rules. lyriic’s dedicated Blank verse, Sonnet, and Heroic couplet checkers share the same ten-syllable iambic target; this page is the open, unbounded line cycle. Rhyme schemes are not enforced.