Can I use the JR Pass on subways?

No. The JR Pass only covers JR-operated lines, which includes most Shinkansen and some regional JR trains, but not local city subways or private lines.

Should I buy the pass before I arrive?

Yes, if you decide it is worth it, buy your Exchange Order online before you fly. However, you can now purchase passes at some JR stations, though they are slightly more expensive than pre-purchased vouchers.

Is the Japan Rail Pass worth buying?

The Japan Rail Pass is only worth buying if you are traveling long distances on the Shinkansen (bullet train) more than three times in a seven-day period. For most travelers doing a standard Tokyo-Kyoto-Osaka loop, point-to-point tickets are cheaper than the pass.

Calculate your individual legs. List every city you plan to visit and use a calculator like the JR Pass Fare Calculator to find the cost of individual Shinkansen tickets for each leg.
Compare against the pass price. Check the current price of a 7-day, 14-day, or 21-day JR Pass. If your total from Step 1 is lower than the pass price, buy individual tickets.
Account for non-JR travel. Remember that the JR Pass does not cover local subways, private rail lines (like Odakyu or Keisei), or the fastest 'Nozomi' and 'Mizuho' trains. If your route relies on these, the pass provides even less value.
Book via SmartEX or station kiosks. If you don't need a pass, create an account on the SmartEX app to book tickets in advance or simply buy them at station 'Midori-no-madoguchi' offices or automated kiosks before you board.

Can I use the JR Pass on subways?: No. The JR Pass only covers JR-operated lines, which includes most Shinkansen and some regional JR trains, but not local city subways or private lines.
Should I buy the pass before I arrive?: Yes, if you decide it is worth it, buy your Exchange Order online before you fly. However, you can now purchase passes at some JR stations, though they are slightly more expensive than pre-purchased vouchers.