CELTA vs TEFL: Which Qualification Do You Actually Need?
I did my CELTA in Glasgow in the summer of 1989. It was four weeks of the most intense professional training I have ever experienced — taught practice every day, written assignments in the evenings, observed lessons, feedback sessions. I came out of it exhausted and genuinely prepared.
Thirty-five years later, the CELTA is still the gold standard. But the qualification landscape has become considerably more complicated, and many teachers arrive in Asia with certificates that are worth very little and aren't sure why they're struggling to get interviews.
The CELTA — what it is and why it matters
The CELTA (Certificate in English Language Teaching to Adults) is a qualification awarded by Cambridge English. It involves a minimum of 120 hours of training, of which at least six hours are observed and assessed teaching practice with real learners.
It is universally recognised. Every reputable international school knows what a CELTA is. Every premium hagwon director has seen one. It signals that you have been observed teaching, assessed, and found to be competent. The cost (typically £1,000–£1,500 in the UK, comparable elsewhere) is a genuine investment in your employability.
If you can do a CELTA, do a CELTA.
TEFL certificates — the honest range
TEFL is not a specific qualification — it's a category. 'I have a TEFL certificate' can mean almost anything.
At the top end: a 120-hour course from a reputable provider with observed teaching practice. These are genuinely useful and recognised by most language centres and government school programmes.
In the middle: 120-hour online courses with no observed teaching component. These vary enormously in quality. Some are rigorous and useful. Many are not. Schools know the difference.
At the bottom: 40-hour or 'weekend' online certificates sold for £20–£50. I will be direct — these are not worth the PDF they're printed on. I have seen teachers arrive in Thailand with these certificates genuinely confused about why reputable schools are not interested in them.
The minimum I would recommend to any serious teacher: a 120-hour course with some form of observed or assessed teaching component.
Does the country you're going to change the answer?
Yes, considerably.
South Korea (EPIK): accepts TEFL/CELTA, requires minimum 100 hours for most programmes. A CELTA makes you a stronger candidate but is not required.
China (international schools): increasingly requires CELTA or equivalent for premium positions. Government and lower-tier positions accept 120-hour TEFL.
Japan (JET): does not require any TEFL qualification — a degree is sufficient for the JET Programme. Eikaiwa chains train you on arrival.
Thailand: varies by school. International schools want CELTA. Language centres typically require a minimum 120-hour TEFL certificate. Government schools are more flexible.
Vietnam: 120-hour TEFL is standard. CELTA preferred at premium schools but not always required.
What about DELTA and TESOL?
The DELTA (Diploma in English Language Teaching to Adults) is the advanced Cambridge qualification — the step after CELTA. It opens doors to senior positions, teacher training roles, and director of studies positions. It is hard, expensive, and worth every bit of both for the right career stage.
TESOL qualifications vary. A TESOL diploma from a reputable provider is well-regarded and roughly equivalent to a CELTA in most markets. A TESOL certificate from an unknown online provider is worth much less.
My summary: CELTA for your first job. 120hr TEFL with practicum if CELTA is not accessible. DELTA when you're serious about making ESL a long-term career.