Study in USA · Guide
English Proficiency Exam Guide: TOEFL iBT vs. IELTS vs. Duolingo (DET)
Updated 31 August 2026 · 3 min read
Executive Summary: Choosing the Right Exam
All US universities require international students from non-English speaking nations to demonstrate English language proficiency.
As an Indian student or parent, you can choose between three major test options: TOEFL iBT, IELTS Academic, and the Duolingo English Test (DET).
Here is what Indian families need to know upfront:
- TOEFL iBT is the US Standard: Created by ETS (a US organization), TOEFL is accepted by 100% of US universities. Top STEM programs require a score of 80 to 100+.
- Duolingo (DET) is Fast & Low-Cost: At $59 USD (compared to $200+ for TOEFL/IELTS), the Duolingo English Test can be taken online from home in 1 hour, with results delivered in 48 hours. Over 70% of US universities now accept DET!
- Teaching Assistantship (TA) Speaking Rules: If you plan to apply for a Teaching Assistantship (TA) to get an In-State tuition waiver (Assistantships Guide), universities enforce a strict TOEFL Speaking score of 26+ or IELTS Speaking score of 8.0+.
Head-to-Head Exam Comparison Matrix
| Exam Feature | TOEFL iBT | IELTS Academic | Duolingo English Test (DET) |
|---|---|---|---|
| Testing Format | Computer-Based (Test Ctr / Home) | Computer or Paper-Based | 100% Online from Home |
| Exam Duration | ~2 Hours | ~2 Hours 45 Minutes | 1 Hour |
| Registration Fee | ~$205 USD (₹17,000) | ~$215 USD (₹17,800) | ~$59 USD (₹4,900) |
| Score Scale | 0 to 120 Points | 0 to 9.0 Band Score | 10 to 160 Points |
| US Acceptance Rate | 100% of US Universities | 98% of US Universities | ~75% of US Universities |
| Result Delivery | 4 to 8 Days | 3 to 5 Days | 48 Hours |
Score Cutoff Thresholds for US Universities
| TIER 1: TOP 30 R1 UNIS | TIER 2: TOP 100 R1 UNIS | TIER 3: REGIONAL UNIS |
|---|---|---|
| • TOEFL: 100+ (Min 25 subscores) • TOEFL: 80 - 90 | • TOEFL: 71 - 79 | |
| • IELTS: 7.5 Band | • IELTS: 6.5 - 7.0 Band | • IELTS: 6.0 Band |
| • DET: 125 - 135+ | • DET: 110 - 120 | • DET: 100 - 105 |
💡Parent Tip: If your child needs quick score results to meet an upcoming application deadline (Deadlines Strategy Guide), take the Duolingo English Test (DET) first. It provides certified results within 48 hours for under ₹5,000!
English Language Proficiency Waivers
You may qualify for an automatic English exam waiver if you meet either of these criteria:
- Medium of Instruction (MOI) Certificate: You earned your 4-year B.Tech degree in India from an institution where the sole medium of instruction was English, and the university provides an official MOI letter. (Accepted by universities such as UT Arlington, Illinois Tech, and Stevens).
- US Undergraduate Degree: You completed a 4-year undergraduate degree or previous Master's degree inside the United States.
Next Steps for Students & Parents
- Check assistantship speaking requirements: Graduate Assistantships Guide.
- Learn how SOP writing compliments your application: SOP & Resume Blueprint Guide.
- Review application submission timelines: Priority vs Rolling Deadlines Guide.