13 Orphans Calculator

13 Orphans Calculator helps you score Mahjong hands and keep games moving at the table. Score hands across Riichi, MCR / Chinese Official, Hong Kong, and Taiwanese Mahjong, with support for custom rule profiles. Build your completed hand, enter the relevant scoring details, and review the result with clear point and payment information. Game tracking tools help tables record wins, draws, rounds, dealer changes, and score movement without needing an account. Designed for real Mahjong tables, 13 Orphans Calculator keeps the scoring process organized so you can spend less time calculating and more time playing. Features include: • Riichi Mahjong scoring • MCR / Chinese Official scoring • Hong Kong Mahjong scoring • Taiwanese Mahjong scoring • Custom rule profiles • Hand building and score calculation • Game and score tracking • Local-first play with no account required Optional Pro features are available through a one-time lifetime unlock.