Can I use the JR Pass on the Tokyo Metro?

No. The JR Pass only covers JR-operated lines, which include the Shinkansen and the JR Yamanote loop line in Tokyo. It does not cover private subways or bus lines.

Is the pass worth it if I only stay in one city?

Almost certainly not. It is only cost-effective if you are making multiple long-distance trips, such as Tokyo to Kyoto and Osaka to Hiroshima.

How to Purchase and Activate a Japan Rail Pass

Purchase your JR Pass online at least 14 days before your trip to receive an Exchange Order, or buy a digital pass directly from the official JR website. Once in Japan, you must visit a JR ticket machine or office to exchange your voucher or activate your digital pass before you can board any Shinkansen.

Choose your duration. Decide between 7, 14, or 21-day consecutive passes. Calculate your total train costs using a tool like Navitime or Google Maps to ensure the pass is actually cheaper than buying individual tickets.
Purchase online. Buy your pass via the official Japan Rail Pass website. If you buy through the official site, you receive a digital activation code. If you buy through a third-party agent, they will ship you a paper Exchange Order (allow 10-14 days for shipping).
Activate on arrival. Bring your passport and your Exchange Order (or digital confirmation) to a JR Ticket Office or a designated ticket machine with a passport reader. Select your start date—you can choose a date within 30 days of activation.
Reserve seats. With your activated pass, use the ticket machines at the station to book specific seat reservations for Shinkansen trains at no extra cost. Always keep your physical JR Pass with you; you need it to enter the automated ticket gates.

Can I use the JR Pass on the Tokyo Metro?: No. The JR Pass only covers JR-operated lines, which include the Shinkansen and the JR Yamanote loop line in Tokyo. It does not cover private subways or bus lines.
Is the pass worth it if I only stay in one city?: Almost certainly not. It is only cost-effective if you are making multiple long-distance trips, such as Tokyo to Kyoto and Osaka to Hiroshima.