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How Long Does It Take to Learn English? Calculator by CEFR Level (FSI Method)

Q: How many hours do I need to reach B2 English from zero?

Per **FSI-based estimates**, English requires **500–600 cumulative hours** to reach B2 (equivalent to Cambridge FCE or IELTS 5.5–6.5). At 1 effective hour per day, that's roughly **20–24 months** without immersion. At 3 hours daily, it compresses to 8–12 months.

Q: What is the difference between FSI and CEFR?

They are different frameworks. The **CEFR** (Common European Framework of Reference) classifies proficiency levels from A1 to C2 based on observable skills. The **FSI** (U.S. Foreign Service Institute) estimates instruction hours needed to reach proficiency. The FSI classifies languages by difficulty for English speakers into categories; this calculator uses FSI-style hour benchmarks mapped onto CEFR levels.

Q: How many hours separate B2 from C1, and C1 from C2?

From B2 to **C1**: ~150–200 additional hours (cumulative total ~700–800 h). From C1 to **C2**: ~300–400 additional hours. The C1-to-C2 plateau is the longest; many learners stall because they already 'get by' and stop practicing deliberately.

Q: Do apps like Duolingo count as FSI hours?

**Only partially.** FSI hours assume structured instruction with active production. Duolingo trains vocabulary and receptive comprehension but limits spoken output. One hour of Duolingo equals roughly 0.3–0.5 h of FSI-style study. Using it as a complement (10–15 min/day) is optimal — not as the core of your plan.

Q: What level do I need to work at an international company?

**B2 minimum, C1 preferred** for roles with frequent communication in English. In tech/IT, B1+ can be enough for technical roles. Global companies commonly ask for **TOEFL ≥ 90 or IELTS ≥ 6.5** in hiring processes.

Q: What's the most efficient method to learn English as an adult?

The research literature (Krashen, Nation) agrees: **massive comprehensible input** (material at 70–90% comprehension) + **regular output** (speaking and writing even with mistakes) + **immediate feedback** + **daily consistency**. A practical scheme: 30 min of input + 15 min of output + 10 min of flashcard review per day.

Calculate how many weeks you need to reach your target English level (A2, B1, B2, C1, C2) based on FSI hour estimates and your weekly study hours. Full hours-per-CEFR-level table included.

🗓️ Updated June 2026 Reviewed by Martín Rodríguez

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Reviewed by: Martín Rodríguez (editorial policy ) · Last reviewed: Jun 20, 2026

Total hours needed for target CEFR level*

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Effective study hours per week*

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How long will it take you to learn English? It depends on your current level, your goal, and the real weekly hours you put in. According to the U.S. Foreign Service Institute (FSI), English-level proficiency in a Category I language takes roughly 600–750 hours of active instruction to reach B2–C1 from scratch. This calculator takes the hours you still need for your target level and the effective weekly hours you can study, and returns the estimated weeks — with real exam context (IELTS, TOEFL, Cambridge).

When to use this calculator

Calculate how long it takes to go from B1 to B2 at your current pace (e.g., 200 hours ÷ 8 h/week = 25 weeks).
Plan when you can sit IELTS or TOEFL by fixing the date and working out the weekly hours required.
Compare intensities: an intensive course (15 h/week) vs. independent study (5 h/week) to be ready before a job interview.
Check whether a program's pace (e.g., Duolingo 20 min/day ≈ 2 h/week) is realistic for reaching B2 within the advertised timeframe.

CEFR Level Hours & Reference Exams (FSI-based, 2026)

CEFR Level	Cumulative hours from zero	Hours to reach from previous level	Reference exam
A1	70–100 h	70–100 h	—
A2	180–200 h	~100 h	Cambridge KET
B1	350–400 h	~170 h	PET / IELTS 4.0–5.0 / TOEFL 42–71
B2	500–600 h	~200 h	FCE / IELTS 5.5–6.5 / TOEFL 72–94
C1	700–800 h	~200 h	CAE / IELTS 7.0–8.0 / TOEFL 95–110
C2	1,000–1,200 h	~400 h	CPE / IELTS 8.5–9.0 / TOEFL 110+

Fuente: FSI Language Difficulty Rankings (U.S. Foreign Service Institute) + Cambridge English CEFR level guide + ETS TOEFL Score Comparison (2026)

How it works

How Long Does It Take to Learn English? FSI Table by CEFR Level

The formula is a direct division:

weeks = hours_needed ÷ hours_per_week

Where hours needed = cumulative hours for your target level (per FSI/Cambridge estimates) minus the cumulative hours of your current level.

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2026 Table: Hours per CEFR Level in English (FSI-based)

CEFR Level	Cumulative hours from zero	Description	Reference exam
A1	70–100 h	Basic phrases and introductions	—
A2	180–200 h	Everyday and personal topics	Cambridge KET
B1	350–400 h	Conversation on familiar topics	PET / IELTS 4.0–5.0 / TOEFL 42–71
B2	500–600 h	Fluency in professional contexts	FCE / IELTS 5.5–6.5 / TOEFL 72–94
C1	700–800 h	Advanced academic and workplace English	CAE / IELTS 7.0–8.0 / TOEFL 95–110
C2	1,000–1,200 h	Near-native mastery	CPE / IELTS 8.5–9.0 / TOEFL 110+

Source: FSI Language Difficulty Rankings + Cambridge English CEFR level guide.

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Estimated Weeks to Climb One Level by Weekly Hours

Hours remaining	5 h/wk	8 h/wk	10 h/wk	15 h/wk
A1→A2 (~100 h)	20 wks	12.5 wks	10 wks	7 wks
A2→B1 (~170 h)	34 wks	21 wks	17 wks	11 wks
B1→B2 (~200 h)	40 wks	25 wks	20 wks	13 wks
B2→C1 (~200 h)	40 wks	25 wks	20 wks	13 wks
C1→C2 (~400 h)	80 wks	50 wks	40 wks	27 wks

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What Counts as 'Effective Hours'?

FSI estimates are based on active instruction:

In-person or live classes with a teacher: 100% of face value.

Guided practice (writing, grammar drills, pronunciation): 100%.

Active listening (podcasts with tasks, shadowing): 70–80%.

TV shows/movies with English subtitles: 40–50%.

Vocabulary apps (Anki, pure Duolingo): 30–50%.

English TV in the background without attention: ~0%.

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Factors That Speed Up or Slow Down Progress

Full immersion (living in an English-speaking country): multiplies speed by 1.5–2×.

One-on-one vs. group classes: private tutoring is 30–50% more efficient per hour.

High levels (C1→C2): the plateau is long; progress per hour is smaller.

Frequency beats volume: 1 hour daily beats 7 hours crammed into a single day for retention.

Example: from B1 to B2 at 8 hours per week

Current level: B1 (≈ 350 cumulative hours from zero per FSI estimates).

Target level: B2 (≈ 550 cumulative hours). Hours remaining: 550 − 350 = 200 hours.

Study hours per week: 8 h (e.g., 4 one-hour classes + 4 h of independent practice).

Calculation: 200 ÷ 8 = 25 weeks (≈ 5.8 months).

Enter: 200 hours and 8 h/week → Result: 25.0 weeks.

25.0 weeks to reach B2 at 8 h/week (≈ 5.8 months)

Frequently asked questions

How many hours do I need to reach B2 English from zero?

Per FSI-based estimates, English requires 500–600 cumulative hours to reach B2 (equivalent to Cambridge FCE or IELTS 5.5–6.5). At 1 effective hour per day, that's roughly 20–24 months without immersion. At 3 hours daily, it compresses to 8–12 months.

How many weeks separate B1 from B2?

The gap between B1 (~350 h) and B2 (~550 h) is approximately 200 hours. At 10 h/week = 20 weeks (≈ 5 months). At 5 h/week = 40 weeks (≈ 10 months).

What is the difference between FSI and CEFR?

They are different frameworks. The CEFR (Common European Framework of Reference) classifies proficiency levels from A1 to C2 based on observable skills. The FSI (U.S. Foreign Service Institute) estimates instruction hours needed to reach proficiency. The FSI classifies languages by difficulty for English speakers into categories; this calculator uses FSI-style hour benchmarks mapped onto CEFR levels.

How many hours separate B2 from C1, and C1 from C2?

From B2 to C1: ~150–200 additional hours (cumulative total ~700–800 h). From C1 to C2: ~300–400 additional hours. The C1-to-C2 plateau is the longest; many learners stall because they already 'get by' and stop practicing deliberately.

Do apps like Duolingo count as FSI hours?

Only partially. FSI hours assume structured instruction with active production. Duolingo trains vocabulary and receptive comprehension but limits spoken output. One hour of Duolingo equals roughly 0.3–0.5 h of FSI-style study. Using it as a complement (10–15 min/day) is optimal — not as the core of your plan.

What level do I need to work at an international company?

B2 minimum, C1 preferred for roles with frequent communication in English. In tech/IT, B1+ can be enough for technical roles. Global companies commonly ask for TOEFL ≥ 90 or IELTS ≥ 6.5 in hiring processes.

How many weeks do I need to study before taking IELTS or TOEFL?

Invert the formula: if you know the exam date, divide the hours you're missing by the weeks available to get the weekly hours required. Example: you're 200 hours short and have 20 weeks → you need 10 effective h/week.

Do I lose my level if I stop practicing English?

Yes, and faster than expected. Without practice, a C1 regresses to B2 in 6–12 months, and a B2 drops to B1 in 18–24 months. Speaking rusts first. To maintain your level: 15–20 min/day of input + 1 weekly conversation.

What's the most efficient method to learn English as an adult?

The research literature (Krashen, Nation) agrees: massive comprehensible input (material at 70–90% comprehension) + regular output (speaking and writing even with mistakes) + immediate feedback + daily consistency. A practical scheme: 30 min of input + 15 min of output + 10 min of flashcard review per day.

Sources & references

Methodology & trust

Editorial

Calculadora de educación revisada por el equipo editorial de Hacé Cuentas, contrastada con FSI Language Difficulty Rankings — U.S. Foreign Service Institute, según nuestra política editorial y metodología.

Updates

Última revisión: June 20, 2026. Los parámetros se verifican periódicamente con las fuentes citadas.

Privacy

Calculations run 100% in your browser. We do not store or transmit your data.

Limitations

Indicative results. For critical decisions, consult a professional.

📌 How to cite this calculator

Rodríguez, M. (2026). How Long Does It Take to Learn English? Calculator by CEFR Level (FSI Method). Hacé Cuentas. https://hacecuentas.com/english-mcer-level-hours-fsi

Contenido bajo licencia CC-BY 4.0 — reutilizable citando la fuente con enlace a Hacé Cuentas.

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