Typical sizes

Crib:      45″ x 45″ needs a backing measuring a minimum of  53″ x 53″

Lap:       50″ x 50″ needs a backing measuring a minimum of 58″ x 58″

Youth:   55″ x 72″ needs a backing measuring a minimum of  63″ x 63″

Twin:    66″ x 84″ needs a backing measuring a minimum of  74″ x  92″

Full:      82″ x 99″ needs a backing measuring a minimum of  90″ x 107″

Queen: 90″ x 99″ needs a backing measuring a minimum of  98″x 107″

King:  110″ x 110″ needs a backing measuring a minimum of 118″x 118″