Start with the current product grid
The current official Discover Seoul Pass front page lists a 72-hour pass at ₩90,000,≈£47.4 a 120-hour pass at ₩130,000,≈£68.5 Pick 3 Basic at ₩49,000≈£25.8 and Pick 3 Theme Park at ₩70,000≈£36.9. Some older or secondary pages can show other durations, so the calculator is tied to the current front-page products and sends you back to the official live list before purchase.
Count only a route you can execute
Timed validity runs consecutively after the first free-attraction use. Add only attractions that remain eligible and can realistically fit inside the chosen 72- or 120-hour block after travel, meals, queues and closed days. Each attraction is normally available once, so repeat visits do not increase the value.
Do not manufacture bonus value
The official product includes a five-day eSIM, but enter eSIM value only if you would otherwise pay for compatible data. The calculator excludes coupons, transport conditions and benefits you would not buy. That makes the recommendation more conservative than adding every advertised regular price.