that'd vs that'll, What's the Difference?

Which to use

“that'd” and “that'll” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.

#10,463
“that'd” frequency rank: #7,622
“that'll” frequency rank: 18085
confusion score

Side-by-Side Comparison

Feature	that'd	that'll
Definition	that would	That will.

Where the eye mixes that'd and that'll

Muted = shared; highlighted = the visual trap. They share 5 letters in sequence. that'd runs 5 letters (CCVCC) against that'll's 6 (CCVCCC) - the length gap alone is often enough to separate them once you know to check it.

6 ch

that'd

7 ch

that'll

Why the eye confuses that'd with that'll

A purely visual mix-up. that'd (/ˈðætəd/) and that'll (/ˈðætl̩/) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they differ by 1 letter(s) in length. Our composite confusion score for this pair is 18085, derived from the frequency rank of both members and their visual similarity.

that'd is recorded at frequency rank #10,463, classified as acontraction, pronounced /ˈðætəd/. that'll is at rank #7,622, tagged as acontraction, pronounced /ˈðætl̩/.

Glosses for this pair are partially populated in our dataset, but the full side-by-side definitions above should still guide you to the right choice.

With a confusion score of 18085, this pair ranks #447,215 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of that'd vs that'll

Shared letters: aht. Private to "that'd": d. Private to "that'll": l.

"that'd" · 5 letters · shape CCVCC · "that'll" · 6 letters · shape CCVCCC

Frequently Asked Questions

Is swapping "that'd" for "that'll" ever safe?

No. They are said differently (/ˈðætəd/ versus /ˈðætl̩/) and carry different meanings; reading the sentence aloud is usually enough to catch the wrong one.

Which is more common, "that'd" or "that'll"?

"that'll" is the more common of the two: it sits at frequency rank #7,622 in our English list, against #10,463 for "that'd". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

Useful next steps

Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.

Full dictionary entry for "that'd" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "that'll" - compare definitions side by side with the headword page. Word entry
This pair ranks #447,215 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
"that'd" and "that'll" also get mixed up with nearby pairs, the highest-scored neighbour is "that'd vs thawed". Nearby pair

Confusion rank #447,215 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.