Calculated by dividing the FTE number of pupils by the FTE number of qualified teachers (head teachers, acting head teachers, assistant head teachers, deputy heads and other qualified teachers).
Cyfrifir y rhain o'r nifer o ddisgyblion FTE, wedi eu rhannu gan y nifer o athrawon FTE (prifathrawon, pennaeth dros dro, pennaeth cynorthwyol, dirprwyon ac athrawon cymwysedig eraill).