Matiks is GMCA’s associated practice platform for beginning to intermediate calculators, as well as those looking for daily challenges and periodic contests!

A basic overview of the world of Japanese soroban is available here. GMCA also offers a Japanese soroban rating test simulator here.

Practice simulators available here and competition app available here.

If you are looking for practice guides, WorldMentalCalculation includes guides for approaching certain competition-style formats.

Global Mental Calculators Association:

Mental Calculation League

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Two Seasons per year: Spring/Summer and Fall/Winter

Match videos available here and on GMCA Youtube page.

Season 2 regular season began on December 6! Here are links to Season 1: Results, Standings, and Season Statistics.

Please visit “Mental Calculation League” section to Register for Season 3 (estimated to begin in April 2025) and for more information.

Practice “league simulator,” as well as other calculation simulators, are available here. The Calculation League app —with FAQ and an instructional video — is available here.