What is the Duolingo English Test (DET)?

DET is an at-home computer-delivered English proficiency test scored 10–160. It is accepted by 4,500+ US institutions, hundreds of universities in Canada/UK/Australia, and a growing number of graduate programmes.

How does DET 120 map to IELTS?

DET 120 ≈ IELTS 7.0 (CEFR B2/C1 boundary). DET 95 ≈ IELTS 6.0, DET 105 ≈ IELTS 6.5, DET 130 ≈ IELTS 7.5, DET 145 ≈ IELTS 8.0+.

How much should I prepare for DET?

From a stable B1 baseline, four weeks at 30 minutes/day is enough to reach DET 100–120. The c-test (Read and Complete) is the format that needs dedicated practice.

Can I retake DET if I miss my target?

Yes, but DET enforces a 30-day gap between paid attempts and a maximum of 3 attempts in any 30-day window. The system blocks bookings that violate this.

Duolingo English Test (DET): Format, Scoring and a 4-Week Prep Plan

DET is at-home, fast and cheap — but the format is unlike IELTS or TOEFL. This guide breaks down all 28 question types, the 10–160 scoring scale, the sub-scores, and a focused four-week prep plan built around c-test and Listen and Type.

1. Why DET is rising

The Duolingo English Test takes about an hour, is taken at home through your webcam, costs roughly US$59, and most often delivers results within 48 hours. Those three properties — at-home, cheap, fast — explain why acceptance grew from a small US base to thousands of universities worldwide between 2020 and 2026.

But the format is unlike IELTS or TOEFL. Carryover preparation is limited.

2. The 28-item adaptive format

DET mixes about 28 items across these types:

Read and Complete (c-test): a short passage with half-words to complete
Read Aloud: record yourself reading a sentence
Listen and Type: dictation, with up to 3 replays
Read and Select: identify real words in a list of 18 (with distractors)
Listen and Select: identify real words in an audio list
Write About the Photo: a single sentence about an image
Speak About the Photo: 30 seconds about an image
Interactive Reading: a passage + 4–6 follow-up questions
Interactive Listening: a multi-turn dialogue with embedded questions
Writing Sample: ~50 words, 5 minutes (not scored but visible to admissions)
Speaking Sample: a 1–3 minute free response (also visible to admissions)

Two things to note: the test is adaptive, so doing well pushes difficulty up; and mistakes early are expensive because they pull difficulty back down.

3. Scoring: 10–160 plus four sub-scores

The total ranges 10–160 in 5-point steps. You also get four sub-scores:

Literacy (reading + writing)
Comprehension (reading + listening)
Conversation (listening + speaking)
Production (writing + speaking)

Approximate CEFR map:

DET total	CEFR	IELTS-equivalent
90–115	B1	4.0–5.0
120–140	B2	5.5–6.5
145–160	C1–C2	7.0–9.0

4. What's different about DET prep

AI grading + human review. Pronunciation clarity matters more than accent. Mumbled English costs points fast; accented but clear English does not.
No traditional speaking section. All speaking is recorded against a webcam without a real conversation partner.
C-test heavy. Read and Complete carries serious weight and is unfamiliar to most candidates.

5. Four-week prep plan (30 min/day)

Week 1 — format familiarity + c-test

8 daily c-test items (switch to DET c-test mode)
10 daily word dictation items
1 free official practice test by day 7

Week 2 — Listen and Type

8 sentence-dictation items daily, at L2 difficulty
Target: 90% word-perfect after at most 2 replays

Week 3 — Read Aloud + Speak About the Photo

10 shadowing items daily
1 daily 1-minute description against a random photo, recorded and reviewed
Focus on clarity over speed; aim for 150–170 words per minute

Week 4 — Write About the Photo + Writing Sample

1 daily image-sentence (30 seconds)
1 daily 50-word paragraph, 5 minutes
Use our writing tool with the L2 essay rubric

6. Common mistakes

Skipping c-test practice. It's heavily weighted; don't ignore it.
Microphone too far from mouth. Buy an inline lavalier or use a headset.
Image sentences that lack a verb. The AI rewards grammatical completeness.
Reading too fast on Read Aloud. Stick under 180 words/minute. Speed without clarity is penalised.
Stacking three retakes inside 30 days. The official policy allows it but candidates report worsening results from over-exposure.

7. Honest assessment

DET is not difficult. It is unfamiliar and fast. Build the muscle memory in 4 weeks; then expect scores to stabilise quickly after one or two attempts. That stability is also why it has spread so widely on the admissions side.