Record No.
MRB-2026-006306
World Record Holder in Rapid Mental Calculation
Human Achievement
No Photo
Record Holder
Yusnier Viera
Cuba
Category
Human Achievement
Country
Cuba
(
CU )
Achievement Date
—
Verification Status
Reference
Record Description
Cuban mathematician Yusnier Viera holds multiple Guinness World Records for rapid mental calculation, including calendar-date calculation, earning him the nickname "the human calendar."
Mega Record Book
This record is published in the
Mega Record Book global record database.