PADI Open Water Koh Tao: Cost, Days & How to Choose

Featured image: Amada44, CC BY-SA 4.0, via Wikimedia Commons.

PADI Open Water Koh Tao at a glance

Prices and hours checked November 2026. Every PADI Open Water course has the same three parts: knowledge development, confined-water skills and 4 open-water dives. On Koh Tao, shops list anything from 2.5 to 4 days for that package. One PADI center lists ฿12,000 with gear and 2 nights' stay. Another lists ฿11,000 for 4 days. Browse the full range of Koh Tao courses if you are still choosing a level.

• Duration: 2.5 to 4 days, depending on eLearning and group pace
• Open water dives: 4
• Depth limit: 18 m
• Listed course fees: ฿11,000 to ฿12,000

What the certification lets you do

Open Water certification is lifetime. It lets you dive with a buddy to 18 m without an instructor. Going beyond 18 m needs the next level up. The Advanced Open Water step extends the limit to 30 m. A PADI Open Water card is also the prerequisite for Rescue Diver and the professional track. Agencies such as SSI and RAID generally accept it as the entry qualification for their own advanced courses.

Day by day: 2.5, 3 and 4-day formats

The gap between 2.5 and 4 days comes down to where you study and how fast your group moves. A 2.5-day schedule assumes you finish PADI eLearning at home. Doing theory in person on the island adds about a day. Pool or confined-water sessions, group pace and weather can stretch any format. One SSI center warns that its 06:00 departure on day 3 can shift with conditions. If you are island-hopping on a tight budget of days, the shorter format fits. A relaxed pace suits the 4-day version.

What it costs: course fee versus extras

Course fees listed by four centers cluster between ฿11,000 and ฿12,000. Most include gear and materials, but check the line items before comparing. Extras can add more than the gap between shops. A Thai dive medical costs ฿1,000 to ฿1,500 and takes about 30 minutes. One SSI center includes basic accident cover for 30 days, with up to ฿1,000,000 for accidents and ฿500,000 for medical costs. That cover excludes evacuation. Ask every shop what insurance covers, and whether hyperbaric treatment and evacuation are included.

PADI, SSI and RAID: does the agency matter?

Many shops on Koh Tao teach SSI or RAID instead of PADI. All three list 4 open-water dives and an 18 m limit for the entry course. Each describes its certification as lifetime and valid worldwide. Course materials, apps and rating systems differ. Ask yourself two questions. Do you plan to continue with one agency, and does the instructor and group size suit you? A shop with a small group may serve you better than a famous logo. One SSI center lists a try dive at ฿3,800 with an ฿8,100 upgrade to full certification. Ask any PADI shop whether it offers a similar credit.

Requirements: swim test, medical, age and flying

PADI's stated swim test is a 10-minute float plus a 200 m swim, or 300 m with mask, fins and snorkel, with no time limit. An SSI center lists a 10-minute float plus 20 m, or 300 m with snorkel gear. These are agency-specific, so match the test to the course you book. The PADI medical statement is a yes/no form. Any "yes" needs a doctor's signature before you dive. One center says it cannot refund the course if clearance fails after you arrive. Age rules are also not uniform. Shops list 10 for Junior Open Water, with a 12 m limit, and 15 for full Open Water, while one RAID center says 15. Confirm your age category on the PADI course page. Finally, avoid flying within 24 hours of diving. DAN publishes guidance on flying after diving, and shops advise arriving the day before your course.

• Mistake: flying out the day after your last dive
• Mistake: leaving the medical until you reach the island
• Mistake: booking on price alone without asking about group size and refunds

How to choose a dive shop

Treat these as questions, not rankings. One PADI center says its maximum is 4 students per instructor. PADI's own limit is higher, so ask for the number in writing. Compare shops using the list below. Once you have a shortlist, a one-day try dive before certifying shows how a team handles beginners.

• Group size: maximum students per instructor, in the water and on the boat
• Boat or shore: where dives 1 to 4 take place
• Language: is theory offered in yours?
• Gear: what is included, and is the mask fitted to your face?
• Instructor: will the same person be on all 4 dives?
• Money: deposit size, refund terms, and what happens if weather cancels a dive
• Insurance: whether evacuation and hyperbaric cover are included

Beginner dive sites and what you may see

Dive sites vary by shop and weather. One PADI center uses Twin Peaks or Japanese Gardens on dive 1, at 8 to 12 m. Dive 2 can be White Rock or Aow Leuk at 12 to 15 m. Dive 3 returns to 15 to 18 m. Dive 4 adds a compass exercise: swim out 30 m and return. Reported sightings include parrotfish, damselfish, cuttlefish and the occasional turtle. If you want photos of those dives later, an underwater photography class builds on your skills.

Planning your trip: arrival, ferries and stay

Arrive at least 1 day before the course starts. Koh Tao is reached by ferry. One route is a flight to Koh Samui or Surat Thani, then a short ferry. Another is an overnight bus or train from Bangkok to Chumphon, then a ferry. Check the operator's timetable so you do not land mid-course. Sairee Beach is a base for several centers, and another dive school departs from Tanote Bay. Some shops sell accommodation bundles, such as the 2 nights in a 2.5-day package. Compare the bundle with booking a room yourself.

After Open Water: next steps

Many divers continue straight to Advanced Open Water. One center lists 5 adventure dives, a 30 m limit, 2 days and ฿9,900. Another lists 1.5 days and ฿11,000. Those differences are worth asking about when you book. Certified divers who want practice without a course can book guided fun dives. Further along, the Rescue Diver course builds safety skills. Divers aiming at a career can look at divemaster training and the instructor development route.