Student to Instructor Ratio on Koh Tao: What's Best for Your Course?

Student to Instructor Ratio on Koh Tao: What's Best for Your Course?

Choosing a dive school on Koh Tao isn't just about location or price—the size of your training group can make the difference between a rushed certification and an unforgettable learning experience. Most schools on Koh Tao maintain a 4:1 student-to-instructor ratio during Open Water training, but understanding what this means—and whether you should seek something tighter—will help you get the best value for your course investment.

PADI and SSI Standards: What the Rules Allow

Both PADI and SSI, the world's leading scuba certification agencies, permit instructors to train up to 4 students per dive during Open Water certification dives. This ratio is based on decades of safety research and ensures each student receives adequate supervision and instruction.

The 4:1 ratio is the maximum allowed, not the target. In practice, many Koh Tao schools comfortably hit this number during peak season (November–April), when hundreds of divers descend on the island to earn certifications. During quieter months, you might find yourself in a smaller group simply due to fewer bookings.

It's worth noting that the 4:1 standard applies